Archive for the ‘Seismic Hazard’ Category
Posted by feww on June 12, 2014
SEISMIC HAZARD
HEIGHTENED GLOBAL SEISMICITY
SCENARIOS 08, 07
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Earthquake Strikes in the Intermountain Seismic Belt (ISB)
Centered at 40.891°N, 111.683°W the quake struck at a depth of about 11.9km.
EQ Location Map
Source: USGS/EHP
EQ Details
Magnitude: 3.3Mw
Event Time: 2014-06-12 04:34:04 UTC
Location: 40.891°N 111.683°W depth=11.9km (7.4mi)
Nearby Cities:
- 16km (10mi) E of Centerville, Utah
- 16km (10mi) E of Bountiful, Utah
- 19km (12mi) ESE of Farmington, Utah
- 19km (12mi) ENE of North Salt Lake, Utah
- 22km (14mi) NE of Salt Lake City, Utah
UTAH – Earthquake History – USGS/EHP
On March 12, 1934, at 8:06 a.m., an earthquake of intensity VIII originating near Kosmo, on the north shore of Great Salt Lake, affected an area of about 440,000 square kilometers, including much of northern Utah and parts of Idaho, Montana, Nevada, and Wyoming. This tremor, which measured magnitude 6.6, could have caused great damage in a densely populated area. Because of the sparse settlement in the region there was very little damage – mostly demolished chimneys and cracked walls in poorly constructed buildings. Two deaths, however, were attributed to the shock. The outstanding feature of the earthquake, related to the Hansel Valley fault, was the emission of large quantities of water from fissures and craterlets. Considerable faulting occurred in the epicentral region. Precise leveling revealed that areas sank to depths up to 390 millimeters. The onset of the shock was abrupt. There were no foreshocks, but aftershocks continued for 2 days; only one, at 11:20 a.m. on the same day, was outstanding (magnitude 6.0). There was moderate damage over a broad area, including Salt Lake City, where plaster fell. All chimneys fell in Kosmo and Monument; fissures, holes, cracks, and springs appeared in connection with a belt of fractures at least 8 kilometers long. The second shock was slightly less severe than the main tremor. Intensities for the aftershock are very unreliable because many observers tried to describe both earthquakes in a single report. Another strong aftershock (magnitude 5.5) affected an area of about 45,000 square kilometers in northern Utah and southern Idaho on May 6. It was reported to be strongest in Salt Lake City and Preston, Idaho, where the intensity reached VI.
IMPORTANT NOTICE: FIRE-EARTH EQ Forecast
The next detailed FIRE-EARTH Earthquake Forecast will be released together with Bulletin NO. 106 on June 14, 2014.
Posted in earhquake forecast, earhquake hazard, Seismic Hazard | Tagged: FIRE-EARTH earthquake FORECAST, Great Salt Lake, Hansel Valley fault, ISB, Kosmo, Middle Rocky Mountains, Utah Earthquake, Utah Earthquake location map | Leave a Comment »
Posted by feww on May 2, 2014
SEISMIC HAZARD
HEIGHTENED GLOBAL SEISMICITY
VOLCANIC HAZARD
NIGHTMARE SCENARIOS 07, 08
.
Mount St. Helens remains active, but no signs of impending eruption: CVO
The magma reservoir beneath Mount St. Helens has been slowly re-pressurizing over the past 6 years, according to the Cascades Volcano Observatory (CVO).
The re-pressurization is probably due to the arrival of a small amount of additional magma some 4 to 8 km beneath the surface, said CVO.
“Since the end of the 2004-2008 dome-building eruption at Mount St. Helens, scientists at the USGS Cascades Volcano Observatory (CVO) and the Pacific Northwest Seismic Network (PNSN) have been monitoring subtle inflation of the ground surface and minor earthquake activity reminiscent of that seen in the years following the 1980-1986 eruptions. Careful analysis of these two lines of evidence now gives us confidence to say that the magma reservoir beneath Mount St. Helens has been slowly re-pressurizing since 2008.”
The re-pressurization in not unexpected because Mount St. Helens is in an active period, as it has been since 1980, said CVO, adding that there was no indication the volcano could erupt anytime soon.
St Helens 1980 Eruption
The eruption on May 18, 1980, which was heralded by a magnitude 5.2 earthquake, covered an area larger than 600 km² with volcanic matter, destroying entire forests, killing 57 people and causing about $1.2buillion in property damage.
Prior to 1980, Mount St. Helens had the shape of a conical, youthful volcano sometimes referred to as the Mount Fuji of America. During the 1980 eruption the upper 400 m (1,300 ft) of the summit was removed by a huge debris avalanche, leaving a 2 x 3.5 km (1.2 x 2.2 mi) horseshoe-shaped crater now partially filled by a lava dome and a glacier. It is primarily an explosive dacite volcano with a complex magmatic system.
Mount St. Helens was formed during four eruptive stages beginning about 275,000 years ago and has been the most active volcano in the Cascade Range during the Holocene. Prior to about 12,800 years ago, tephra, lava domes, and pyroclastic flows were erupted, forming the older St. Helens edifice, but a few lava flows extended beyond the base of the volcano. The bulk of the modern edifice (above the 1980 crater floor) was constructed during the last 3,000 years, when the volcano erupted a wide variety of products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the north flank, and were witnessed by early settlers. (Source: CVO/USGS)
Volcano Details (CVO)
Location: Washington, Skamania County
Latitude: 46.2° N
Longitude: 122.18° W
Elevation: 2,549 (m) 8,363 (f)
Volcano type: Stratovolcano
Composition: Basalt to Rhyodacite
Most recent eruption: 1980 (May 18), 2004-2008
Nearby towns: Castle Rock, WA; Olympia, WA; Vancouver, WA; Yakima, WA; Portland, OR
Alert Level: Normal (2014-04-30 09:05:42)
Mount St. Helens, Washington simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.
Posted in Global Disaster watch, Seismic Hazard, Significant Event Imagery, significant events, volcanic hazard, volcanism | Tagged: CVO, earthquake, Mount St. Helens, NIGHTMARE SCENARIO 07, St Helens Volcano, Washington | 1 Comment »
Posted by feww on May 3, 2010
More Shocks Could Strike Japan Region
Strong Earthquake Measuring up to 6.2Mw Strikes Izu Islands, Japan Region
The quake, centered at 29.8N, 141.6E, struck Torishima Kinkai region at a depth of about 50km on Monday, 03 May 2010 19:28 JST (10:28UTC), Japan’s Meteorological Agency (JMA) reported.
Tsunami Status
JMA did NOT issue any tsunami warnings, advisory or watch, probably due to the fact that the shock occurred deep below the ocean surface.
Approximate Distances (USGS/EHP)
- 300 km (190 miles) NNW of Chichi-shima, Bonin Islands, Japan
- 405 km (250 miles) SSE of Hachijo-jima, Izu Islands, Japan
- 535 km (335 miles) N of Iwo Jima, Volcano Islands, Japan
- 685 km (425 miles) S of TOKYO, Japan
Fire-Earth Forecasts:
-
More shocks, possibly stronger than this quake, could strike Japan Region as a result of a new wave of seismic activity in the region.
-
Intense volcanic activity may occur in Japan Region in 2010.
Fire-Earth’s Earlier Forecasts:
Earthquake Details According to GFZ Potsdam – Earthquake Bulletin
Region: Southeast of Honshu, Japan
Time: 2010-05-03 10:27:46.7 UTC
Magnitude: 6.2
Epicenter: 141.41°E, 29.69°N
Depth: 107 km
Status: manually revised
© Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ
Related Links:
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Posted in earhquake forecast, Izu Islands quake, Seismic Hazard, seismic hazard warning, Torishima Kinkai | Tagged: Bonin Islands, Chichi-shima, Hachijo-jima, japan earthquake, Japan Region Earthquake | Leave a Comment »
Posted by feww on April 14, 2010
Powerful Earthquake measuring up to 7.0Mw strikes Northern Qinghai, China
The earthquake epicentered at 33.271°N, 96.629°E striking 240 km (150 miles) NNW of Qamdo, Xizang (Tibet), at a depth of about 10km on Tuesday, April 13, 2010 at 23:49:37 UTC.
A foreshock measuring up to 5.3Mw preceded the mainshock, which was followed by at least 3 significant aftershocks, the largest of which measured up to 6.1Mw.
Death and Casualties
Initial news from the area puts the death toll from the quake at about 100. The death toll is expected to rise. There’s no reliable report concerning the number of injured, but hundreds of people may have been injured. many victims are still buried under the rubble.
Earthquake Location Map. Source: European-Mediterranean Seismological Center. Click image to enlarge
Earthquake Details
- Magnitude [USGS estimate]: 6.9
- Date-Time:
- Tuesday, April 13, 2010 at 23:49:37 UTC
- Wednesday, April 14, 2010 at 07:49:37 AM at epicenter
- Location: 33.271°N, 96.629°E
- Depth: 10 km (6.2 miles)
- Region: SOUTHERN QINGHAI, CHINA
- Distances:
- 240 km (150 miles) NNW of Qamdo, Xizang (Tibet)
- 375 km (235 miles) SSE of Golmud, Qinghai, China
- 520 km (325 miles) SSE of Da Qaidam, Qinghai, China
- 1905 km (1190 miles) WSW of BEIJING, Beijing, China
- Source: USGS NEIC (WDCS-D)
- Event ID: us2010vacp
Population Exposure Map. Source: USGS/EHP. Click image to enlarge.
Overall, the population in this region resides in structures that are highly vulnerable to earthquake shaking, though some resistant structures exist. On June 15, 1982 (UTC), a magnitude 5.6 earthquake 338 km Southeast of this one struck China, with estimated population exposures of 1,000 at intensity VII and 2,000 at intensity VI, resulting in a reported 11 fatalities. USGS
Seismic Hazard Map of the Region.Source: USGS/EHP. Click image to enlarge.
Related Links:
Serial No 1,571. Starting April 2010, each entry on this blog has a unique serial number. If any of the numbers are missing, it may mean that the corresponding entry has been blocked by the authorities/Google in your country. Please drop us a line if you detect any anomaly/missing number(s).
Posted in China earthquake, earthquake, earthquake report, Northern Qinghai quake, Seismic Hazard | Tagged: Da Qaidam earthquake, Earthquake Clusters, mining related earthquake, Tibet quake, Xizang | 2 Comments »
Posted by feww on April 11, 2010
Powerful 7.1Mw Earthquake strikes Solomon Islands 94 km (58 miles) WSW of Kira Kira
The earthquake occurred on Sunday April 11, at 09:40:31UTC striking at a depth of about 60km. The epicenter was located at 10.90ºS ; 161.16ºE.
A larger earthquake may strike the region.
Summary of Earthquake Details:
- Magnitude: 7.1Mw
- Region: SOLOMON ISLANDS
- Date time: 2010-04-11 at 09:40:31.0UTC
- Location: 10.90ºS ; 161.16ºE
- Depth 60 km (+/- 15 km)
- Distances:
- 1538 km E Port moresby (pop 283,733 ; local time 19:40 2010-04-11)
- 213 km SE Honiara (pop 56,298 ; local time 20:40 2010-04-11)
- 94 km SW Kira kira (pop 1,122 ; local time 20:40 2010-04-11)
- Source: European-Mediterranean Seismological Center
Earthquake Location Map. Click image to enlarge.
Tsunami Evaluation:
A destructive pacific-wide tsunami is not expected. However, local tsunami may occur. “Earthquakes of this size sometimes generate local tsunamis that can be destructive along coasts located within a hundred kilometers of the earthquake epicenter. Authorities in the region of the epicenter should be aware of this possibility and take appropriate action.” PTWC said.
Related Links:
Serial No 1,562. Starting April 2010, each entry on this blog has a unique serial number. If any of the numbers are missing, it may mean that the corresponding entry has been blocked by the authorities/Google in your country. Please drop us a line if you detect any anomaly/missing number(s).
Posted in earthquake, earthquake forecast, feww earthquake forecast, Seismic Hazard | Tagged: Honiara quake, Kira Kira quake, Solomon Islands, Solomon Islands earthquake | Leave a Comment »
Posted by feww on April 6, 2010
Serial No 1,542. If any posts are blocked in your country, please drop us a line.
Powerful earthquake measuring up to 7.9Mw strikes northern Sumatra, Indonesia
The quake struck at a depth of about 46km (28.6 miles) on April 06, 2010 at 22:15:02UTC about 205 km (125 miles) WNW of Sibolga, Sumatra, Indonesia. The epicenter was located at 2.236°N, 97.046°E.
The quake struck about 160km southeast of the magnitude 9.1 quake which triggered the destructive Boxing Day tsunami in 2004.
The epicenter was also about 34km NNW of the a magnitude 8.6 shock which occurred on March 28, 2005.
A magnitude 7.6 quake in West Sumatra in September 2009 killed 1,000 people, official records showed.
Tsunami Evaluation
The following bulletin was issued by the PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS a short time ago:
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER. FOR THOSE AREAS – WHEN DAMAGING WAVES HAVE NOT OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME THE THREAT IS PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR SEVERAL HOURS DUE TO RAPID CURRENTS. AS LOCAL CONDITIONS CAN CAUSE A WIDE VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION
MUST BE MADE BY LOCAL AUTHORITIES.
NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE INDIAN OCEAN ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL SEA LEVEL CHANGES AND STRONG OR UNUSUAL COASTAL CURRENTS.
ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS WITHIN THE WARNING AND WATCH AREAS ARE GIVEN BELOW. ACTUAL ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN SUCCESSIVE WAVES CAN BE FIVE MINUTES TO ONE HOUR.
LOCATION FORECAST POINT COORDINATES ARRIVAL TIME
———————————————————————————————————
INDONESIA SIMEULUE 2.5N 96.0E 22:46UTC 06 APR
+++++++++++BELAWAN 3.8N 98.8E 02:33UTC 07 APR
ADDITIONAL BULLETINS WILL BE ISSUED BY THE PACIFIC TSUNAMI WARNING CENTER FOR THIS EVENT AS MORE INFORMATION BECOMES AVAILABLE.
THE JAPAN METEOROLOGICAL AGENCY MAY ISSUE ADDITIONAL INFORMATION FOR THIS EVENT. IN THE CASE OF CONFLICTING INFORMATION…THE MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.
There was no report of damage or casualties, as of posting. However, a major power blackout on Simeulue Island, west of Aceh province, Indonesia, has been reported.
Updates will posted in the comments section of this post.
Earthquake Details:
- Magnitude [USGS Estimate] 7.8
- Date-Time:
- Tuesday, April 06, 2010 at 22:15:02 UTC
- Wednesday, April 07, 2010 at 05:15:02 AM at epicenter
- Location: 2.236°N, 97.046°E
- Depth: 46 km (28.6 miles)
- Region: NORTHERN SUMATRA, INDONESIA
- Distances:
- 205 km (125 miles) WNW of Sibolga, Sumatra, Indonesia
- 230 km (145 miles) SW of Medan, Sumatra, Indonesia
- 525 km (325 miles) W of KUALA LUMPUR, Malaysia
- 1425 km (880 miles) NW of JAKARTA, Java, Indonesia
- Location Uncertainty: horizontal +/- 7.4 km (4.6 miles); depth +/- 11.6 km (7.2 miles)
- Source: USGS NEIC (WDCS-D)
- Event ID: us2010utc5
Seismotectonics of the Indonesian Region
The Indonesian region is one of the most seismically active zones of the earth; at the same time it has a leading position from the point of view of active and potentially active volcanoes. It is a typical island-arc structure with its characteristic physiographic features, such as a deep oceanic trench, a geanticline belt, a volcanic inner arc and a marginal basin.
In most subduction zones, motion of the subducted plate is nearly perpendicular to the trench axis. In some cases, for example Sumatra, where the motion is oblique to the axis, a strike-slip fault zone is seen, and is lying parallel to the volcanic chain.
In the subduction zone southwest of Sumatra, the Sunda trench axis strikes approximately N 37°W. The Indian Ocean crust is moving in an azimuth of approximately N 23°E relative to Southeast Asia, giving an angle of obliquity of 60°. Eastern Indonesia, forming the southeastern extremity of the Southeast Asian lithospheric plate, crushed between the northward-moving Indo-Australian and the westward-moving Pacific plates, is certainly the most complex active tectonic zone on earth. The rate of subduction is some centimeters per year; for example, it is 6.0 cm per year in the West Java Trench at 0°S 97°E (azimuth 23°); 4.9 cm per year in the East Java Trench at 12°S 120°E (azimuth 19°); and 10.7 cm per year in New Guinea at 3°S 142°E (azimuth 75°).
Frequent volcanic eruptions and frequent earthquake shocks testify to the active tectonic processes which are currently in progress in response to the continued movement of these major plates. The distribution of small ocean basins, continental fragments, remnants of ancient magmatic arcs and numerous subduction complexes which make up the Indonesian region indicate that the past history of the region was equally tectonically active.
Abridged from Southeast Asia Association of Seismology and Earthquake Engineering, Series on Seismology, Volume V – Indonesia, June 1985. (Source: USGS/EHP)
Maps
Related Links:
Historic Earthquakes in Indonesia
- 1917 01 20 – Bali, Indonesia Fatalities 1,500
- 1938 02 01 – Banda Sea, Indonesia – M 8.5
- 1965 01 24 – Sanana, Indonesia (Ceram Sea) – M 7.6 Fatalities 71
- 1976 06 25 – Papua, Indonesia – M 7.1 Fatalities 5,000
- 1992 12 12 – Flores Region, Indonesia – M 7.8 Fatalities 2,500
- 2000 06 04 – Southern Sumatera, Indonesia – M 7.9 Fatalities 103
- 2002 10 10 – Irian Jaya, Indonesia – M 7.6 Fatalities 8
- 2002 11 02 – Northern Sumatera, Indonesia – M 7.4 Fatalities 3
- 2003 05 26 – Halmahera, Indonesia – M 7.0 Fatalities 1
- 2004 01 28 – Seram, Indonesia – M 6.7
- 2004 02 05 – Irian Jaya, Indonesia – M 7.0 Fatalities 37
- 2004 02 07 – Irian Jaya, Indonesia – M 7.3
- 2004 07 25 – Southern Sumatra, Indonesia – M 7.3
- 2004 11 11 – Kepulauan Alor, Indonesia – M 7.5 Fatalities 34
- 2004 11 26 – Papua, Indonesia – M 7.1 Fatalities 32
- 2004 12 26 – Sumatra-Andaman Islands – M 9.1 Fatalities 227,898
- 2005 01 01 – Off the West Coast of Northern Sumatra – M 6.7
- 2005 02 19 – Sulawesi, Indonesia – M 6.5
- 2005 02 26 – Simeulue, Indonesia – M 6.8
- 2005 03 02 – Banda Sea – M 7.1
- 2005 03 28 – Northern Sumatra, Indonesia – M 8.6 Fatalities 1,313
- 2005 04 10 – Kepulauan Mentawai Region, Indonesia – M 6.7
- 2005 05 14 – Nias Region, Indonesia – M 6.7
- 2005 05 19 – Nias Region, Indonesia – M 6.9
- 2005 07 05 – Nias Region, Indonesia – M 6.7
- 2005 11 19 – Simeulue, Indonesia – M 6.5
- 2006 01 27 – Banda Sea – M 7.6
- 2006 03 14 – Seram, Indonesia – M 6.7 Fatalities 4
- 2006 05 16 – Nias Region, Indonesia – M 6.8
- 2006 05 26 – Java, Indonesia – M 6.3 Fatalities 5,749
- 2006 07 17 – South of Java, Indonesia – M 7.7 Fatalities 730
- 2007 01 21 – Molucca Sea – M 7.5 Fatalities 4
- 2007 03 06 – Southern Sumatra, Indonesia – M 6.4 Fatalities 67
- 2007 07 26 – Molucca Sea – M 6.9
- 2007 08 08 – Java, Indonesia – M 7.5
- 2007 09 12 – Southern Sumatra, Indonesia – M 8.5 Fatalities 25
- 2007 09 12 – Kepulauan Mentawai region, Indonesia – M 7.9
- 2007 09 20 – Southern Sumatra, Indonesia – M 6.7
- 2007 10 24 – Southern Sumatra, Indonesia – M 6.8
- 2007 11 25 – Sumbawa Region, Indonesia – M 6.5 Fatalities 3
- 2008 02 20 – Simeulue, Indonesia – M 7.4 Fatalities 3
- 2008 02 25 – Kepulauan Mentawai region, Indonesia – M 7.2
- 2008 11 16 – Minahasa, Sulawesi, Indonesia – M 7.4 Fatalities 6
- 2009 01 03 – Near the North Coast of Papua, Indonesia – M 7.7 Fatalities 5
- 2009 01 03 – Near the North Coast of Papua, Indonesia – M 7.4
- 2009 02 11 – Kepulauan Talaud, Indonesia – M 7.2
- 2009 08 16 – Kepulauan Mentawai region, Indonesia – M 6.7
- 2009 08 28 – Banda Sea – M 6.9
- 2009 09 02 – Java, Indonesia – M 7.0 Fatalities 81
- 2009 09 30 – Southern Sumatra, Indonesia – M 7.5 Fatalities 1,117
- 2009 10 01 – Southern Sumatra, Indonesia – M 6.6
- 2009 10 24 – Banda Sea – M 6.9
- 2009 11 08 – Sumbawa region, Indonesia – M 6.6 Fatalities 2
Posted in earthquake, Indonesia, KUALA LUMPUR, Medan, Seismic Hazard | Tagged: BELAWAN, Indonesia earthquake, Java earthquake, Sibolga, SIMEULUE, sumatra quake, sumatra tsunami, tsunami | 1 Comment »
Posted by feww on January 28, 2010
Strong Earthquake Measuring Up to 6.3Mw Strikes Near Catanduanes Island Province, Philippines Islands
An earthquake measuring up to magnitude 6.3 struck about 140 km (90 miles) ESE of Pandan, Catanduanes Island Province, Philippines at an estimated depth of 25 km on Wednesday, January 27, 2010 at 18:50 UTC
Mt Mayon
The earthquake struck about 193 km (120 miles) ENE of Mt Mayon and could potentially trigger the volcano for another round of unrest/activity. The quake followed two earlier shocks which struck the same area on January 21, 2010, with the larger event measuring up to 5.8Mw.
Damage/ Casualties
As of posting, there were no reports of damage or casualties.
Tsunami Report
The Hawaii Pacific Tsunami Warning Center did not issue a tsunami warning, or watch.
FEWW Forecast: Fire-Earth Moderators believe a Mega-quake could strike in or around Philippines Islands.
10-degree Map Centered at 15°N,125°E
EQ Location Map. Source: USGS/EHP. Enhanced by FEWW. Click image to enlarge.
Earthquake Details:
- Magnitude reported by USGS: 6.1 [Max EQ magnitude estimated by FEWW: 6.3 Mw]
- Date-Time:
- Wednesday, January 27, 2010 at 18:49:33 UTC
- Thursday, January 28, 2010 at 02:49:33 AM at epicenter
- Location: 13.684°N, 125.440°E
- Depth: 24.7 km (15.3 miles)
- Region: PHILIPPINE ISLANDS REGION
- Distances:
- 140 km (90 miles) ESE of Pandan, Catanduanes, Philippines
- 190 km (120 miles) ENE of Legaspi, Luzon, Philippines
- 200 km (125 miles) NNE of Calbayog, Samar, Philippines
- 495 km (305 miles) ESE of MANILA, Philippines
- Location Uncertainty: horizontal +/- 7.6 km (4.7 miles); depth +/- 22.1 km (13.7 miles) (?)
- Source: USGS NEIC (WDCS-D)
- Event ID: us2010rzbv
Historic Seismicity Since 1900
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS/EHP. Enhanced by FEWW. Click image to enlarge.
Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS/EHP. Enhanced by FEWW. Click image to enlarge.
PHILIPPINE ISLANDS REGION: Estimated Population Exposed to Earthquake Shaking [PDF]
Related Links:
Posted in earthquake forecast, Manila, Philippines quake, Seismic Hazard, shake map | Tagged: Calbayog, Catanduanes, earthquake, Legaspi quake, Mt Mayon, Pandan, Philippines earthquake, Philippines seismicity, Samar | Leave a Comment »
Posted by feww on October 3, 2009
Previous Updates:
As of Saturday, October 3, virtually no help has reached rural areas.
Up to 4,000 people (figure provided by UN officials) are feared trapped under hundreds of thousands of tons of rubble after a magnitude 7.9 quake destroyed more than 25,000 houses and buildings across seven districts on a 100-km stretch along the western coast of Sumatra island, Indonesia on September 30, 2009.
“We estimate there are still eight people trapped alive under Ambacang Hotel. We are still trying hard to evacuate them,” a rescuer told reporters, in Padang.
Indonesians look at bodies from under a cloth barrier after they were pulled from the rubble of buildings, at a hospital in the Sumatran Island city of Pedang, Indonesia, Friday, Oct. 2, 2009. Medical teams, search dogs, backhoes and emergency supplies were flown into the devastated western coast of Indonesia’s Sumatra island Friday to bolster frantic rescue attempts for thousands buried by a powerful earthquake. (AP Photo/Kevin Frayer). Image may be subject to copyright.
An Indonesian man climbs down from a house that collapsed on top of a car in Wednesday’s earthquake ,in Padang, Indonesia, Friday, Oct. 2, 2009. Medical teams, search dogs, backhoes and emergency supplies were flown into the devastated western coast of Indonesia’s Sumatra island Friday to bolster frantic rescue attempts for thousands buried by a powerful earthquake. (AP Photo/Kevin Frayer). Image may be subject to copyright.
Situation in the Disaster Areas:
- Power outages are reported in most districts, phone lines are down.
- Water and food are in very short supply.
- Villagers are digging out the dead with bare hands.
- Cost of recovery operation is estimated at least $400 million, according to Indonesia’s Vice President.
- Rural areas are cut off by massive landslides, which have reportedly blocked roads and destroyed a number of villages, killing about 300 people.
- There are no structures standing in the district of Pariaman, a hilly community of about 370,000 about 80 km north of Padang, an AP journalist has reported.
Related Links:
Posted in largest earthquakes, Pacific Ring of Fire, Pariaman District, Powerful earthquakes, Seismic Hazard | Tagged: Earthquakes, human-enhanced disasters, Indonesia quake, Padang Quake, sumatra quake | 1 Comment »
Posted by feww on September 3, 2009
Strong 6.2 Mw quake strikes off the south-western tip of the Island of Kyushu, Japan
The earthquake, reported by various seismic monitoring centers, occurred on Thursday, September 03, 2009 at 13:26 UTC at a depth of about 160 km some 70 km SW of Kagoshima, Kyushu, Japan.
The 6th strong quake to strike Japan Region in the past several weeks, this event was consistent with FEWW earlier forecast. On August 17, FEWW Moderators forecast a series of powerful earthquakes in the region and said as many as 10 additional magnitude 6+ quakes could yet strike the region in coming weeks.
Summary of this earthquake:
GFZ Potsdam – Earthquake Bulletin
Region: Kyushu, Japan
Time: 2009-09-03 13:26:18.4 UTC
Magnitude: 6.2
Epicenter: 130.19°E 31.18°N
Depth: 166 km
© Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ
JMA Map shows the intensity of th equake as recorded by various stations throughout the Islands of Kyushu and Honshu, Japan. Image may be subject to copyright.
Japan Meteorological Agency (JMA) reported NO tsunami caused by this quake.
There was no report of any casualties at the time of posting.
10-degree Map Centered at 30°N,130°E
Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW.
Seismic Hazard Map [Source: USGS]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Historic Seismicity [Mag 7+ EQs since 1900] – USGS
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Related Links
Posted in Earthquakes, Fukuoka, global earthquakes, Okinawa Islands, seismic activity report, Seismic Hazard | Tagged: earthquake forecast, japan earthquake 2009, Japan quake, Kyushu quake, Miyazaki, nagasaki, Sendai | Leave a Comment »
Posted by feww on August 28, 2009
Magnitude 6.2 earthquake shakes Northern Qinghai, China, followed by large aftershocks
Strong Earthquake measuring 6.2 Mw struck Northern Qinghai, China, about 35 km ESE of Da Qaidam, Qinghai, China, at a depth of 10 km, on Friday, August 28, 2009 at 01:52 UTC, USGS EHP reported.
The earthquake was followed by at least 4 large aftershocks at the time of writing, two of which measured 5.6 Mw.
Based on FEWW analysis, the earthquake may have been as powerful as a magnitude 6.9 shock, possibly larger, and probably misreported by USGS EHP.
China’s official news agency (Xinhua) reported the event as follows:
6.4-magnitude earthquake jolts NW China
http://news.xinhuanet.com/english/2009-08/28/content_11957440.htm
XINING, Aug. 28 (Xinhua) — An earthquake measuring 6.4 on the Richter scale struck the remote Qinghai Province in northwest China at 9:52 a.m. Friday, the China Earthquake Administration said, but no casualties have been reported.
A total of 128 aftershocks had been registered by 11 a.m. near the epicenter in the Da Qaidam (also known as Dachaidan) district in the Mongolian-Tibetan Autonomous Prefecture of Haixi, with the strongest measuring 5.3 magnitude that struck at 10:14, according to the Qinghai Provincial Seismological Network.
“So far, we have not received reports of casualties or house collapses,” the provincial government said in a statement.
“The governments of the province, the Haixi prefecture and Golmud City have sent staff to investigate,” it said.
The epicenter, at 37.6 degrees north and 95.8 east, was about 140 km away from Delingha City, the capital of the Haixi prefecture, and about 160 km away from Golmud, another major city in Haixi, according to the China Earthquake Administration.
The quake was strongly felt in both cities, the administration said.
The China Earthquake Administration, the National Disaster Reduction Committee and the Ministry of Civil Affairs have all sent staff to the quake-hit region for relief work.
Da Qaidam is a sparsely populated district with an average altitude of 4,000 meters and about 16,000 people, including Mongolians, Tibetans, Muslim Hui and Han. The district covers 34,000 square km and administers three townships.
Da Qaidam, which literally means “a big salt lake” in Mongolian, is rich in mineral resources, with one of the largest lead-zinc mines in western China and several coal mines. [Emphasis added by Moderator.]
On Nov. 10 last year, a 6.3-magnitude quake struck Da Qaidam but did not cause casualties. The quake only toppled several huts and caused cracks in the walls of some mud houses.
In April 2003, a 6.6-magnitude quake hit the same region but did not cause casualties, either, and only damaged old buildings. Editor: Anne Tang – copyright the news agency.
FEWW strongly believes that this earthquake was triggered by human activity, especially the extensive mining operations in the region.
10-degree Map Centered at 40°N,95°E
Earthquake Location Map. Original map: USGS EHP. Image upgraded by FEWW.
- Magnitude: 6.2
- Date-Time: Friday, August 28, 2009 at 01:52:06 UTC
- Location: 37.721°N, 95.684°E
- Depth: 10 km (6.2 miles)
- Region: NORTHERN QINGHAI, CHINA
- Distances:
- 35 km (20 miles) ESE of Da Qaidam, Qinghai, China
- 165 km (100 miles) NNE of Golmud, Qinghai, China
- 1815 km (1120 miles) W of BEIJING, Beijing, China
- Location Uncertainty: horizontal +/- 8.1 km (5.0 miles); depth fixed by location program
- Parameters: NST= 79, Nph= 79, Dmin=>999 km, Rmss=0.92 sec, Gp= 94°, M-type=teleseismic moment magnitude (Mw), Version=7
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009kwaf
Historic Seismicity (Magnitude 7+ since 1900)
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
In November 2008, a mainshock measuring 6.3 Mw struck Da Qaidam area, followed by a swarm of aftershocks with the three largest shocks measuring 5.4, 5.2 and 5Mw.
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Posted in China earthquake, earthquake report, Earthquakes, seismic activity report, Seismic event, Seismic Hazard | Tagged: China quake, Da Qaidam earthquake, Earthquake Clusters, mining related earthquake, Northern Qinghai quake, Worldwide Earthquakes | 5 Comments »
Posted by feww on August 11, 2009
Magnitude 6.4 Quake strikes Near Shizuoka, the South Coast of Honshu, Japan
A strong earthquake measuring 6.4Mw occurred about 30km SSW of Shizuoka, Japan, USGS reported, striking at a depth of 30km at 20:07:07 UTC on Monday.
The mainshock was followed by a cluster of a dozen aftershocks, the largest of which has measured about 3.9 so far.
Japan’s broadcaster, NHK, reported that the quake had rattled buildings in Tokyo, and that bullet train services had been halted pending track inspection.
10-degree Map Centered at 35°N,140°E
Earthquake Location Map. Source: USGS
Earthquake Details
- Magnitude: 6.4
- Date-Time:
- Monday, August 10, 2009 at 20:07:07 UTC
- Tuesday, August 11, 2009 at 05:07:07 AM at epicenter
- Location: 34.727°N, 138.278°E
- Depth: 26.8 km (16.7 miles)
- Region: NEAR THE SOUTH COAST OF HONSHU, JAPAN
- Distances
- 30 km (20 miles) SSW of Shizuoka, Honshu, Japan
- 55 km (35 miles) E of Hamamatsu, Honshu, Japan
- 110 km (70 miles) SSW of Kofu, Honshu, Japan
- 170 km (105 miles) SW of TOKYO, Japan
- Location Uncertainty: horizontal +/- 9.7 km (6.0 miles); depth +/- 3.6 km (2.2 miles)
- Parameters: NST= 74, Nph= 75, Dmin=708 km, Rmss=1.24 sec, Gp= 50°, M-type=body wave magnitude (Mb), Version=6
- Source: USGS NEIC (WDCS-D)
- Event: ID us2009kdb4
Japan Meteorological Agency seismic intensity scale
The map shows the regions where the maximum observed Seismic Intensity was 3 or greater [see date and time.] JMA Seismic Intensity scale is divided into 10 categories: Scales 0 to 4, 5 lower, 5 upper, 6 lower, 6 upper and 7. For an explanation of the intensity see: Japan Meteorological Agency seismic intensity scale. Image Copyright Japan Meteorological Agency.
Tsunami Advisory
Japan’s Meteorological agency, which registered the quake as 6.6, issued an initial tsunami advisory based on its observation at on august 111, 2009 at 07:13 local time, and reported up to 60cm waves at Yaizu. The initial tsunami advisory was canceled soon after. No tsunami damage was reported.
Initial Tsunami Observation
Copyright Japan Meteorological Agency
Maximum Tsunami Observation –Tsunami Information NUMBER 6
Issued at 06:22 JST 11 Aug 2009
Copyright Japan Meteorological Agency
A Seismically Intense Day or So!
In a 35-hr period between August 9, 2009, at 10:55:56 and August 10, at 20:07:08 5 strong to powerful earthquake struck the Pacific Ring of Fire and Andaman Islands.
Items listed are in order of L to R:) Magnitude, Date, Time, Latitude (degrees), Longitude (degrees), Depth, Locatoion
- 7.1 2009/08/09 10:55:56 33.144 138.040 303.1 IZU ISLANDS, JAPAN REGION
- 6.6 2009/08/10 04:06:32 -11.596 166.093 42.8 SANTA CRUZ ISLANDS
- 5.7 2009/08/10 17:46:28 -3.127 143.179 35.0 NEAR NORTH COAST OF NEW GUINEA, P.N.G.
- 7.6 2009/08/10 19:55:39 14.013 92.923 33.1 ANDAMAN ISLANDS, INDIA REGION
- 6.4 2009/08/10 20:07:08 34.727 138.278 26.8 NEAR THE SOUTH COAST OF HONSHU, JAPAN
Source: USGS/WSJ on line. The map doesn’t include the Mag 7.1 Izu Isles quake
Related Links:
Posted in Japan Tsunami Information, seismic event report, Seismic Hazard, tokyo earthquake forecast, Tsunami Observation | Tagged: earthquake forecast, Earthquake Forecast 2009, Honshu earthquake, japan earthquake, Shizuoka quake | 4 Comments »
Posted by feww on August 11, 2009
Magnitude 7.6 Quake Strikes Near Andaman Islands, India Region
Earthquake Location Map. Source: USGS
Earthquake Details
- Magnitude: 7.6
- Date-Time
- Monday, August 10, 2009 at 19:55:39 UTC
- Tuesday, August 11, 2009 at 01:55:39 AM at epicenter
- Location: 14.013°N, 92.923°E
- Depth: 33.1 km (20.6 miles)
- Region: ANDAMAN ISLANDS, INDIA REGION
- Distances:
- 260 km (160 miles) N of Port Blair, Andaman Islands, India
- 365 km (225 miles) SSW of Pathein (Bassein), Myanmar
- 825 km (510 miles) W of BANGKOK, Thailand
- 2295 km (1420 miles) SE of NEW DELHI, Delhi, India
- Location Uncertainty: horizontal +/- 9.8 km (6.1 miles); depth +/- 5.7 km (3.5 miles)
- Parameters: NST= 64, Nph= 64, Dmin=833.8 km, Rmss=0.86 sec, Gp= 72°, M-type=(unknown type), Version=6
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009kdb2
Seismic Hazard Map [USGS]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Historic Seismicity
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Source: USGS
Tsunami Evaluation:
SEA LEVEL READINGS INDICATE THAT A SIGNIFICANT TSUNAMI WAS NOT
GENERATED. THEREFORE THE TSUNAMI WATCH ISSUED BY THIS CENTER
IS NOW CANCELED.
Related Links:
Posted in earthquake forecast, eathquakes, seismic event report, Seismic Hazard, Tsunami Evaluation | Tagged: Andaman Island quake | Leave a Comment »
Posted by feww on August 9, 2009
Magnitude 7.1 Quake Occurs Near Izu Islands, Japan Region
A powerful earthquake measuring 7.1Mw occurred about 165km W of Hachijo-jima, Izu Islands, Japan, USGS reported, striking at a depth of 303.1km at 10:55:56 UTC.
Japan’s Meteorological agency said there was NO tsunami threat caused by this earthquake.
According to Reuters News Agency, quoting the national broadcaster, NHK, some high-speed train services were briefly suspended, while the tracks were checked, but no damage was reported.
This event raises the probability of FEWW forecast for Tokyo region to about 0.9 (86%).
Earthquake details:
- Magnitude: 7.1
- Date-Time
- Sunday, August 09, 2009 at 10:55:56 UTC
- Sunday, August 09, 2009 at 07:55:56 PM at epicenter
- Location: 33.144°N, 138.040°E
- Depth: 303.1 km (188.3 miles)
- Region: IZU ISLANDS, JAPAN REGION
- Distances
- 165 km (100 miles) W of Hachijo-jima, Izu Islands, Japan
- 175 km (110 miles) S of Hamamatsu, Honshu, Japan
- 205 km (130 miles) S of Shizuoka, Honshu, Japan
- 320 km (200 miles) SSW of TOKYO, Japan
- Location Uncertainty: horizontal +/- 5 km (3.1 miles); depth +/- 8.9 km (5.5 miles)
- Parameters: NST=201, Nph=201, Dmin=668.8 km, Rmss=0.85 sec, Gp= 29°, M-type=teleseismic moment magnitude (Mw), Version=7
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009kcaz
10-degree Map Centered at 35°N,140°E
Earthquake Location Map. Source: USGS
Earthquake Location. [USGS.]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green.
For additional location maps click here.
Historic Seismicity [Source: USGS]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Seismic Hazard Map [Source: USGS]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Related Links:
Posted in Honshu quake, seismic event report, Seismic Hazard, Shizuoka, tokyo quake, tsunami threat | Tagged: earthquake forecast, Earthquakes, Hachijo-jima, Izu Islands quake, IZU quake, japan earthquake | 3 Comments »
Posted by feww on August 5, 2009
Another strong aftershock Strikes Gulf of California
A strong aftershock measuring 5.5Mw struck the Gulf of California on Wednesday, August 5, at 09:13:13 UTC, USGS reported.
The latest aftershock was the third one reported by USGS, which had earlier upgraded a previous aftershock, the largest to date, to a magnitude 6.2 [from 5.9 Mw.]
A powerful mainshock measuring 6.9 shook the Gulf of California on Monday.
10-degree Map Centered at 30°N,115°W
Earthquake Location Map. USGS
Location: 29.615°N, 113.850°W
Depth: 10km
Event ID: us2009jwbr
A powerful aftershock strikes off west coast of the South Island, NZ
Meanwhile, a much stronger aftershock measuring 6.1Mw struck off west coast of the South Island, New Zealand.
Location: 45.472°S, 166.336°E
Depth: 10km
Event ID: us2009jyaw
Click on the link for details of the mainshock:
Powerful 7.8 M Quake Strikes New Zealand Region
Related Links
Posted in Kermadec trench, Mt Ruapehu Eruption Alert, Plate Tectonics, Seismic Hazard | Tagged: California earthquake, earthquake forecast, Earthquake Forecast 2009, NZ earthquake, South Island earthquake | Leave a Comment »
Posted by feww on August 5, 2009
A Magnitude 6.4 Earthquake Struck Southwestern RyuKyu Islands, Japan
A strong earthquake measuring 6.4 Mw struck southwestern RyuKyu Islands, Japan, Wednesday, August 05, 2009, at 00:18 UTC, USGS reported.
So far, there have been no reports of aftershocks, which might follow later. There has continual seismic activity in the area in the past weeks.
Japan Meterological Agency (JMA) posted no No tsunami warning, however, it advised that slight sea level changes may occur.
Earthquake Details
- Date-Time:
- Wednesday, August 05, 2009 at 00:18:00 UTC
- Wednesday, August 05, 2009 at 09:18:00 AM at epicenter
- Location: 24.232°N, 125.007°E
10-degree Map Centered at 25°N,125°E
Earthquake Location Map. USGS
- Depth: 35 km (21.7 miles) set by location program
- Region: Southwestern RyuKyu Islands, Japan
- Distances:
- 84 km (52 miles) ESE (103°) from Ishigaki-jima, Ryukyu Islands, Japan
- 322 km (200 miles) E (97°) from Su-ao, Taiwan
- 343 km (213 miles) SW (232°) from Naha, Okinawa, Japan
- 1150 km (714 miles) NNE (21°) from MANILA, Philippines
- Location Uncertainty: horizontal +/- 5.1 km (3.2 miles); depth fixed by location program
Parameters NST=159, Nph=159, Dmin=366 km, Rmss=0.9 sec, Gp= 40°, M-type=teleseismic moment magnitude (Mw), Version=6
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009jyab
Historic Seismicity Magnitude 7 and Greater Earthquakes Since 1900
[Source: USGS]
Seismic Hazard Map [Source: USGS]
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Related Links:
Posted in Okinawa Islands, Plate Tectonics, Seismic Hazard, Su-ao, tsunami warning | Tagged: earthquake forecast, Earthquakes, Ishigaki-jima, japan earthquake, Japan quake, Ryukyu Islands | 1 Comment »
Posted by feww on August 3, 2009
Details of April 4, 2010 quake in BAJA posted at
A powerful earthquake measuring 6.9Mw and strong fore- and aftershocks rock Baja, California
A strong earthquake measuring 6.9Mw struck Gulf of California Monday, August 03, 2009 at 17:59:56 UTC, USGS reported.
The M6.9 mainshock was preceded by a 5.8Mw foreshock and followed by two aftershocks measuring 5.0 and 5.9Mw.
More aftershocks are almost certain to follow.
AP reported:
Phoenix Fire Department spokesman Alex Rangel said a high-rise near downtown shook violently enough that workers evacuated, but there were no reports of injuries or damage. The quake was centered about 460 miles (740 kilometers) from Phoenix.
Earthquake Details [Mainshock]
- Magnitude: 6.9
- Date-Time:
- Monday, August 03, 2009 at 17:59:56 UTC
- Monday, August 03, 2009 at 10:59:56 AM at epicenter
- Location: 29.066°N, 112.871°W
- Depth: 10 km (6.2 miles) set by location program
- Region: GULF OF CALIFORNIA
- Distances
- 89 km (56 miles) NNE (31°) from Santa Isabel, Baja California, Mexico
- 137 km (85 miles) W (280°) from La Doce, Sonora, Mexico
- 174 km (108 miles) NE (46°) from Guerrero Negro, Baja California Sur, Mexico
- 185 km (115 miles) W (270°) from Hermosillo, Sonora, Mexico
- 553 km (343 miles) SE (133°) from Tijuana, Baja California, Mexico
- Location Uncertainty: horizontal +/- 7.1 km (4.4 miles); depth fixed by location program
- Parameters: NST=140, Nph=140, Dmin=411.8 km, Rmss=1.31 sec, Gp= 97°, M-type=teleseismic moment magnitude (Mw), Version=7
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009jwbh
10-degree Map Centered at 30°N,115°W
Earthquake Location Map. USGS
Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS
Related Links:
Posted in Earthquakes, La Doce Sonora, Seismic Hazard, Seismic report | Tagged: Baja quake, California quake, earthquake forecast, Santa Isabel, Tijuana quake | 5 Comments »
Posted by feww on May 17, 2009
Magnitude 3.3 Quake Strikes Northern Texas
Texas quake likely caused by oil and natural gas drilling activities—Moderators, blog contributors
See below for pictorial evidence / record of
1. Location. The proximity of epicenter to fault zones (quaternary fault and fold deformation).
2. Depth.
3. Historic Seismicity.
Earthquake Details
Magnitude: 3.3
Date-Time:
- Saturday, May 16, 2009 at 16:24:06 UTC
- Saturday, May 16, 2009 at 11:24:06 AM at epicenter
Location: 32.796°N, 97.091°W
Depth: 5 km (3.1 miles) set by location program
Region: NORTHERN TEXAS
Distances:
- 6 km (4 miles) S (179°) from Euless, TX
- 7 km (4 miles) SE (141°) from Bedford, TX
- 9 km (6 miles) ESE (118°) from Hurst, TX
- 11 km (7 miles) NNE (16°) from Arlington, TX
- 28 km (18 miles) W (269°) from Dallas, TX
Location Uncertainty: horizontal +/- 9 km (5.6 miles); depth fixed by location program
Parameters: NST= 11, Nph= 11, Dmin=44.5 km, Rmss=0.86 sec, Gp= 94°, M-type=”Nuttli” surface wave magnitude (mbLg), Version=6
Source: USGS NEIC (WDCS-D)
Event ID: us2009gsba
West Texas – Quaternary Fault and Fold Information for Texas. USGS/Cooperator Texas Bureau of Economic Geology
Gulf of Mexico coastal region: Areas of Quaternary deformation and faulting. (USGS). Click here for Gulf-margin normal faults, Texas and adjacent areas.
Texas Earthquake Information
Historic Information
Institutions
Maps
Notable Earthquakes
Recent Earthquakes
Topics
USGS Information
USGS Geologic Information about Texas
Posted in Arlington TX, Bedford quake, Seismic Hazard, Texas Earthquake, Texas Historic Seismicity | Tagged: Dallas Earthquake, Euless earthquake, North Texas quake, oil and gas drilling, oil drilling quake | 17 Comments »
Posted by feww on April 22, 2009
Satellite image of Earth movement during Italy quake
An Envisat Advanced Synthetic Aperture Radar (ASAR) interferogram interpretation by Italy’s Istituto Nazionale di Geofisica e Vulcanologia (INGV). The large green square represents the Mw 6.3 main shock, the smaller green squares represent the Mw > 5 aftershocks and the black triangles represent GPS stations used for SAR validation. The yellow line east of L’Aquila shows the location of a ~4 km–long alignment of co-seismic surface breaks observed in the field by INGV researchers. This alignment corresponds to a northwest – southeast strip where the spatial fringe rate seems to exceed the limit for interferometric correlation. This may indicate that the fault dislocation reached, or was very close to, the surface along this line. The observed pattern of ground displacement is in very good agreement with the earthquake source mechanism (the ‘beach ball’), confirming that the earthquake source is a normal fault striking 144 degrees (clockwise from north), and dipping to the southwest.
The technique is a sophisticated version of ‘spot the difference’. InSAR involves combining two or more radar images of the same ground location in such a way that very precise measurements – down to a scale of a few millimeters – can be made of any ground motion taking place between image acquisitions.
Each rainbow band represents about 28 millimeters of ground movements. Credits: INGV. Caption: ESA.
Posted in earthquake, interferogram, seismic activity, seismic event forecast, Seismic Hazard | Tagged: ASAR, Ghost of L'Aquila, ground motion, L'Aquila quake, Seismicity | Leave a Comment »
Posted by feww on March 24, 2009
Magnitude 7.4 earthquake could strike California in 2009
FEWW Forecasts a magnitude 7.4 earthquake and two strong aftershocks (5.5+ Mw) striking California in 2009 with a probability of 0.8. The occurrence uncertainty is about 90 days from the estimated time. The epicenter is located in a built-up area.
Moderators are currently discussing the merits of disclosing further details of the event too early ahead of the forecast seismicity.
Related Links:
Posted in Earthquake probability, earthquake rupture, GEOSTATISTICS, Seismic Hazard, tectonic stress | Tagged: aftershock forecast, California earthquake, California earthquake forecast, earthquake forecast, seismic event forecast | 42 Comments »
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