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Posts Tagged ‘Indonesia quake’

41 Earthquakes Strike Oklahoma in November

Posted by feww on December 1, 2013

A large cluster of small but shallow quakes rattles Oklahoma City in November

At least 41 earthquakes measuring 2.5Mw or greater struck the state of Oklahoma in November 2013, according to data provided by USGS/EHP.

The largest shock in the cluster (No. 11 on the table below) measured 3.8Mw, striking at a depth of 5.9km on November 11, 2013 some 5km WNW of Jones, Oklahoma.

  • The average depth of the November quakes was 5.3km.

Oklahoma Quakes - Nov 2013
Map of earthquakes in Oklahoma – Nov 2013. Source: USGS/EHP. Map Enhanced by FIRE-EARTH Blog.

google logo of the day 2

List of Oklahoma Earthquakes measuring 2.5Mw or greater, November 2013.

ok quakes nov2013-s

The following information is mirrored from USGS Site.

Tectonic Summary

Earthquakes in the Stable Continental Region

Natural Occurring Earthquake Activity

Most of North America east of the Rocky Mountains has infrequent earthquakes. Here and there earthquakes are more numerous, for example in the New Madrid seismic zone centered on southeastern Missouri, in the Charlevoix-Kamouraska seismic zone of eastern Quebec, in New England, in the New York – Philadelphia – Wilmington urban corridor, and elsewhere. However, most of the enormous region from the Rockies to the Atlantic can go years without an earthquake large enough to be felt, and several U.S. states have never reported a damaging earthquake. […]

Induced Seismicity

As is the case elsewhere in the world, there is evidence that some central and eastern North America earthquakes have been triggered or caused by human activities that have altered the stress conditions in earth’s crust sufficiently to induce faulting. Activities that have induced felt earthquakes in some geologic environments have included

  • Impoundment of water behind dams,
  • Injection of fluid into the earth’s crust,
  • Extraction of fluid or gas, and
  • Removal of rock in mining or quarrying operations.

In much of eastern and central North America, the number of earthquakes suspected of having been induced is much smaller than the number of natural earthquakes, but in some regions, such as the south-central states of the U.S., a significant majority of recent earthquakes are thought by many seismologists to have been human-induced.  […]

Latest Significant Quakes  (US and Global)

M5.5 – 221km W of Brookings, Oregon 2013-12-01 03:19:37 UTC
Location: 41.652°N 126.891°W depth=10.0km (6.2mi)
Nearby Cities:
+ 246km (153mi) WNW of McKinleyville, California
+ 481km (299mi) SW of Salem, Oregon

M6.4 – Kepulauan Barat Daya, Indonesia 2013-12-01 01:24:13 UTC
Location: 7.014°S 128.376°E depth=10.0km (6.2mi)
Nearby Cities:
+ 340km (211mi) WNW of Saumlaki, Indonesia
+ 353km (219mi) ENE of Dili, East Timor

Related Links

Posted in Significant Event Imagery, significant events | Tagged: , , , , , , , , , , | Leave a Comment »

Strong Quake Strikes N Coast of Papua, Indonesia

Posted by feww on June 26, 2011

Magnitude 6.4 EQ Strikes 172 km N of Enarotali, Papua, Indonesia

Three major earthquakes have struck the region within 330km radius of the epicenter since 1914, including the largest two in the last 40 years (8.1Mw on 10 Jan 1979, and 8.2Mw on 17 Feb 1996).

10-degree Map Centered at 0°N,135°E

EQ Location Map. Source: USGS-EHP. Map enhanced by FIRE-EARTH.

Earthquake Details

  • Magnitude: 6.4Mw
  • Date-Time:
    • Sunday, June 26, 2011 at 12:16:41 UTC
    • Sunday, June 26, 2011 at 09:16:41 PM at epicenter
  • Location: 2.389°S, 136.648°E
  • Depth: 36.1 km (22.4 miles)
  • Region: NEAR THE NORTH COAST OF PAPUA, INDONESIA
  • Distances: 172 km (106 miles) N of Enarotali, Papua, Indonesia
    • 331 km (205 miles) ESE of Manokwari, Papua, Indonesia
    • 1,286 km (799 miles) NNE of DARWIN, Northern Territory, Australia
    • 3,336 km (2072 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty:
    • horizontal +/- 14.6 km (9.1 miles);
    • depth +/- 12.2 km (7.6 miles)
  • Source:USGS NEIC (WDCS-D)
  • Event ID: usc0004gyw

Historic Seismicity [Mag ≥ 7.0 since 1900]


Source: USGS-EHP

Related Links

Posted in earthquakes 2011 | Tagged: , , , , | Leave a Comment »

M7.4 Quake Strikes S. Papua, Indonesia

Posted by feww on September 30, 2010

Powerful 7.4Mw Earthquake Strikes NNW of Dobo, Kepulauan Aru Islands, Indonesia

Indonesia’s Geophysics officials measured the earthquake at 7.4Mw while the USGS/EHP faulty equipment [;)] recorded two shocks measuring 6.2 and 7.2Mw respectively.

Earthquake Location Map. Source: USGS. Enhanced by FEWW

Earthquake Details

  • Magnitude:  7.4 [As recorded by Indonesian seismologists]
    Date-Time:

    • Wednesday, September 29, 2010 at 17:11:24 UTC
    • Thursday, September 30, 2010 at 02:11:24 AM at epicenter
  • Location 4.920°S, 133.783°E
  • Depth: 12.3 km (7.6 miles)
  • Region: NEAR THE SOUTH COAST OF PAPUA, INDONESIA
    Distances:

    • 105 km (65 miles) NNW of Dobo, Kepulauan Aru, Indonesia
    • 310 km (190 miles) WSW of Enarotali, Papua, Indonesia
    • 900 km (560 miles) NNE of DARWIN, Northern Territory, Australia
    • 2,985 km (1850 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty: horizontal +/- 13.7 km (8.5 miles); depth +/- 2.6 km (1.6 miles)
  • Source: USGS NEIC (WDCS-D

Casualties

There was no report of damage and casualties as of posting.

Tsunami

The Pacific Tsunami Warning Center issued NO tsunami warning for the region.

September 30, 2009

A magnitude 7.6 earthquake killed more than 1,000 people in Padang, western Sumatra, exactly a year ago today..

FEWW Forecast

Indonesia Earthquakes

Related Links:

Posted in earthquake, earthquake 2010, earthquake forecast, Earthquake Information | Tagged: , , , , | Leave a Comment »

Magnitude 7.0ML Quake Strikes Obira Indonesia

Posted by feww on March 14, 2010

Powerful Quake measuring 7.0 ML Strikes off the Coast of Obira, Indonesia.

An earthquake measuring  7.0 ML (Richter Scale) struck off the coast of Obira Island, Obi Islands (Kepulauan Obi) a group of islands in the Indonesian province of Maluku.


ShakeMap of Obira.
Source: USGS

The offshore quake occurred at a depth of 56 km on March 14, 2010 at 07:57 am local time (00:57UTC) with the epicenter located at 1.58S  128.20E, about 227 km North of Ambon, Indonesia.

Indonesia’s Meteorology and Geophysics Agency reported.  There were no tsunami warning and, as of posting, no casualties or damage were reported.

Related Links:

Posted in earthquake, Indonesia earthquake, Kepulauan Obi, KEPULAUAN OBI quake, Maluku quake | Tagged: , , , , , | 1 Comment »

Strong Quake Strikes Sunda Strait, Indonesia

Posted by feww on October 16, 2009

Strong Quake Measuring up to 6.4 Mw Strikes Sunda Strait, Indonesia

Strong earthquake measuring about 6.4 Mw struck Sunda Strait about 180 km WSW of JAKARTA, island of Java, Indonesia, at a depth of about 55km on Friday, October 16, 2009 at 09:53 UTC.

Some buildings  in the capital, Jakarta, were reported as swaying by the officials. So far there are no reports damage or casualties. A magnitude 7.9 quake, which struck southern Sumatra on September 30, left up to 1,200 people dead.


The quake shook buildings as far away as Jakarta, causing some people to leave their homes and offices. (Photo: Amee Enriquez, JG). Image may be subject to copyright.

Earthquake Details:

GFZ Potsdam – Earthquake Bulletin
Region: Sunda Strait, Indonesia
Time: 2009-10-16 09:52:55.9 UTC
Magnitude: 6.2  [Maximum quake magnitude estimated by FEWW at 6.4Mw]
Epicenter: 105.45°E 6.47°S
Depth: 64 km
Status: automatic

10-degree Map Centered at 5°S,105°E

sunda strait 16 oct 09
Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW.

USGS/EHP Release

  • Magnitude: 6.1 [Maximum quake magnitude estimated by FEWW at 6.4Mw]
  • Date-Time:
    • Friday, October 16, 2009 at 09:52:52 UTC
    • Friday, October 16, 2009 at 04:52:52 PM at epicenter
  • Location: 6.613°S, 105.182°E
  • Depth: 50.6 km (31.4 miles)
  • Region: SUNDA STRAIT, INDONESIA
  • Distances:
    • 125 km (80 miles) S of T.-Telukbetung, Sumatra, Indonesia
    • 180 km (115 miles) WSW of JAKARTA, Java, Indonesia
    • 185 km (115 miles) W of Sukabumi, Java, Indonesia
    • 265 km (165 miles) W of Bandung, Java, Indonesia
  • Location Uncertainty: horizontal +/- 6.3 km (3.9 miles); depth +/- 8.8 km (5.5 miles)
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009mva4

Related Links [Including FEWW forecasts]

Posted in earthquake forecast, Earthquakes, feww earthquake forecast, seismic activity report, seismic hazard report | Tagged: , , , , , , | 1 Comment »

Earthquakes: Human Enhanced Disasters – UPDATE 3 Oct 2009

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.

Indonesia Earthquake
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.

Indonesia Earthquake
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: , , , , | 1 Comment »

Earthquakes: Human Enhanced Disasters – UPDATE 2 Oct 2009

Posted by feww on October 2, 2009

Sumatra Double Earthquakes

FEWW Moderators believe it’s highly probable that another 2 or more strong to powerful quakes could strike the region in the coming days. Padang and other coastal towns in Sumatra and Java must also prepare for a possible tsunami.

At least 1,200 bodies have been recovered following widespread damage after a magnitude 7.9 quake  struck southern Sumatra, Indonesia, on Wednesday, according to the officials.

The Death Toll Could Reach Many Thousands


There are no reports of deaths from the 6.8 magnitude quake that struck southern Sumatra  on Thursday. However. a local radio station reported that a dozen 12 people had been injured and up to 75 building damaged in  the town of Jambi.

“People are trapped and screaming for help but they are below huge slabs which will take heavy equipment to move,” an aid worker said.

“I saw dozens of the biggest buildings collapsed in town. Most of the damage is concentrated in the commercial center market, which was fully packed,” he said.

Images that will be repeated throughout the world, again, and again

sdq more dead bodies
Residents stand near the bodies of earthquake victims at a hospital in Padang on Indonesia’s Sumatra
island October 1, 2009.  REUTERS/Muhammad Fitrah/Singgalang Newspaper

Regional Economy

West Sumatra, a major producer of crude palm oil, is also affected economically.

Indonesia’s finance minister Sri Mulyani said: “This region has been damaged seriously, including its infrastructure,” adding that her government has allocated $25 million over two month for emergency operations.

Related Links:

Posted in Jambi, Padang Quake, palm oil production, Southern Sumatra quake, Sri Mulyani, sumatra quake | Tagged: , , , , , , | 1 Comment »

Disaster Update: Indonesia Quake

Posted by feww on October 1, 2009

Indonesia Quake, Typhoon Ketsana and Samoa Tsunami

The death toll from the powerful earthquake in southern Sumatra, Indonesia has reached about 200, but is likely to rise sharply.

sumatra quake
Students walk out from a collapsed building after an earthquake hit Padang, on Indonesia’s Sumatra island September 30, 2009. REUTERS/Muhammad Fitrah/Singgalang Newspaper

Let’s be clear about this. The quake that hit Padang, Sumatra, was much stronger than reported. It was at least a magnitude 7.8, about 3 times stronger than reported.

Some high-rise buildings in Singapore, about 450 km northeast of the epicenter felt the tremors, which also shook some office buildings in  Kuala Lumpur, Malaysia.

Indonesia’s Vice President Jusuf Kalla confirmed late last night that in Jakarta, that the death toll would rise because there was substantial damage in the area with many buildings  collapsed.

Based on the information received and experience from the previous events, FEWW Moderators believe that the death toll might be as high as 2 – 3,000, with many more number of injuries.

“The big buildings are down. The concrete buildings are all down, the hospitals, the main markets, down and burned. A lot of people died in there. A lot of places are burning,” Australian businesswoman  in Padang told Australian radio.

“Most of the damage is in the town center in the big buildings. The little houses, the people’s houses, there are a few damaged, but nothing dramatic. It’s not all a rubble heap in terms of smaller buildings.”

“The quake was followed by a very heavy rain. Many houses and some building are flattened in my area. But I cannot yet verify too much. We will try to compile the data and distribute aid once the rain subsides,” the district mayor of Pariaman District, one of the worst hit areas told reporters.

“A number of hotels in Padang have been destroyed,” Rahmat Triyono, an  employee of the Indonesian geophysics and meteorology agency, told AFP.

“Up to now we haven’t been able to reach Padang, communications have been cut,” he added.

An eye-witness reportedly told Reuters that there was “extreme panic” in the city, with bridges collapsing,  and water from broken pipes causing flooding.

Related Links:

Posted in extreme panic, Indonesia quake, pandang quake, Pariaman District, sumatra earthquake | Tagged: , , , , , | 1 Comment »

Powerful Earthquake Strikes Southern Sumatra, Indonesia

Posted by feww on September 30, 2009

More Megaquakes May Strike PRF Anytime

Magnitude 7.9 earthquake strikes southern Sumatra, Indonesia

Magnitude 7.9 earthquake struck southern Sumatra, Indonesia, 50 km (30 miles) WNW of Padang, at a depth  of about 85 km on Wednesday, September 30, 2009 at 10:16 UTC, USGS/EHP reported.

Only hours ago, having briefly analyzed details of the Samoan earthquake, FEWW had foretasted that up to 3 more powerful quakes could strike the Pacific Ring of Fire in 2009.

Four weeks ago a deadly earthquake measuring  7.3 to 7.6 Mw struck off the coast of Java, Indonesia, killing more than 80 people and injuring at least another 1,250.

Tsunami Warning

Pacific Tsunami Warning Center (NOAA) has issued a tsunami warning based on the size and location of the earthquake for countries bordering Indian Ocean: Indonesia, India, Thailand and Malaysia.

Damage Report

“People are panicking. They are running out of the buildings… There are many collapsed buildings,” an eye-witness in Padang told a local TV station.

“Hundreds of houses have been damaged along the road. There are some fires, bridges are cut and there is extreme panic here maybe because water pipes are broken and there is flooding in the streets,” another witness told Reuters.

“Hundreds of houses have been damaged along the road,” another eye-witness in Padang said.

“There are some fires, bridges are cut and there is extreme panic here maybe because water pipes are broken and there is flooding in the streets.”

Padang has a population of just under 1,000,000 people. There were no reports of casualties as of posting; however, given that so many buildings have collapsed, it’s more than likely that many people would have been killed or injured.

According to a local report, power and phone lines are down in Pandang and several other parts of Indonesia.

The mainshock was followed by a strong aftershock measuring 6.0  GFZ Potsdam/ Earthquake Bulletin reported. More strong aftershocks are highly probable.

10-degree Map Centered at 0°N,100°E

Southern Sumatara - 30 September 2009
Earthquake Location Map.
Source USGS/EHP

GFZ Potsdam – Earthquake Bulletin
Region:     Southern Sumatra, Indonesia
Time:     2009-09-30 10:16:10.4 UTC
Magnitude:     7.8
Epicenter:     99.87°E   0.80°S
Depth:     84 km
Status:     manually revised

Earthquake Details (according to USGS)

  • Magnitude: 7.9
  • Date-Time:
    • Wednesday, September 30, 2009 at 10:16:10 UTC
    • Wednesday, September 30, 2009 at 05:16:10 PM at epicenter
  • Location: 0.797°S, 99.925°E
  • Depth: 85 km (52.8 miles)
  • Region: SOUTHERN SUMATRA, INDONESIA
    Distances:

    • 50 km (30 miles) WNW of Padang, Sumatra, Indonesia
    • 225 km (140 miles) SW of Pekanbaru, Sumatra, Indonesia
    • 475 km (295 miles) SSW of KUALA LUMPUR, Malaysia
    • 960 km (600 miles) NW of JAKARTA, Java, Indonesia
  • Location Uncertainty: horizontal +/- 10.6 km (6.6 miles); depth +/- 16.1 km (10.0 miles)
    Parameters:  NST= 44, Nph= 44, Dmin=523.2 km, Rmss=1.44 sec, Gp= 47°,   M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009mebz

Related Links:

Posted in Indian Ocean tsunami, Indonesia tsunami, large earthquakes, megaquakes, sumatra tsunami | Tagged: , , , , , , | 5 Comments »

Deadly Earthquake Strikes Java, Indonesia

Posted by feww on September 2, 2009

Powerful earthquake measuring at least 7.3 Mw strikes off the coast of Java, Indonesia.

FEWW ‘EarthModel’ estimated the magnitude as 7.6 Mw, while the quake was recorded by the European-Mediterranean Seismological Center as a magnitude 7.3Mw (±0.4 )

More than 20 people have been killed according to the initial reports, with  hundreds of structures destroyed or damaged in the city of Tasikmalaya and town of Sukabumi west of Java. Thousands of people have been evacuated, taking refuge in open areas, including the grounds of a military base.

Dozens more people were injured, including up to 50 people in Jakarta, about 190km from the epicenter, officials said.

deadly java quake
Magnitude 7.6Mw destroyed or damaged many buildings in the city of Tasikmalaya west of the island of Java. Photo: AFP. Image may be subject to copyright.

The quake struck offshore, with the epicenter about 115km west-southwest of Tasikmalaya city (190 km SSE of the Capital Jakarta), at a depth of about 60 km.

The mainshock was followed by at least 4 aftershocks, with 2 of the shocks measuring 5.6 and  5.2. Local tsunami warnings automatically issued after the quake have now been withdrawn. Local seismologists reported small  sea levels rises near the west coast of Java.

Summary of Earthquake details as reported by
European-Mediterranean Seismological Center

Magnitude:  7.3 Mw (±0.4 )
Region:  JAVA, INDONESIA

Date and time: 2009-09-02 at 07:55:03.8 UTC
Location: 7.84 S ; 107.35 E
Depth: 70 km
Distances:

  • 91 km S Banjaran (pop 164,952 ; local time 14:55 2009-09-02)
  • 72 km S Banjar (pop 37,263 ; local time 14:55 2009-09-02

Automatic GEOFON Global Seismic Monitor


© Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ

GFZ Potsdam – Earthquake Bulletin

  • Region: Java, Indonesia
  • Time: 2009-09-02 07:55:02.7 UTC
  • Magnitude: 7.4
  • Epicenter: 107.34°E 8.00°S
  • Depth: 62 km
  • Status: manually revised

USGS/EHP
In line with their current practice of downsizing nearly all their EQ reports in 2009, USGS Earthquake Hazard Program downgraded the quake to a magnitude 7.0 Mw.

FEWW Earthquake Forecast For Java/Bali Region:

  • Region: Java/Bali, Indonesia
  • Date of Occurrence: September to Late December 2009
  • Magnitude: 8.4+
  • Epicenter: 10°40’31.43″S 114°55’33.81″E
  • Depth: 40 km

Related Links:

Posted in Challis Oil Field, earthquake forecast, East Nusa Tenggara, Jabiru Oil Field, NW Australia, Plate boundaries, quake forecast, seismic event forecast, Timor Sea, Timor sea quake | Tagged: , , , , , , , , | 8 Comments »

Magnitude 6.8 EQ Strikes BANDA SEA

Posted by feww on August 28, 2009

Powerful Earthquake measuring 6.8Mw strikes Banda Sea

Magnitude 6.8 underwater earthquake struck Banda Sea about 200km SSE of Baubau, Sulawesi, Indonesia, at a depth of 633.2 km, on Friday, August 28, 2009 at 01:51 UTC, USGS/EHP reported.

10-degree Map Centered at 5°S,125°E

Banda Sea Ind
Earthquake Location Map. Original map: USGS EHP. Image upgraded by FEWW.

Details of this Earthquake

  • Magnitude: 6.8
  • Date-Time:
    • Friday, August 28, 2009 at 01:51:19 UTC
  • Location: 7.117°S, 123.444°E
  • Depth: 633.2 km
  • Region:  BANDA SEA
  • Distances
    • 200 km (125 miles) SSE of Baubau, Sulawesi, Indonesia
    • 275 km (170 miles) NE of Ende, Flores, Indonesia
    • 1005 km (620 miles) NW of DARWIN, Northern Territory, Australia
    • 1845 km (1150 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty:  horizontal +/- 7.3 km (4.5 miles); depth +/- 13.1 km (8.1 miles)
  • Parameters: NST= 69, Nph= 69, Dmin=470.3 km, Rmss=0.97 sec, Gp= 40°, M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009kwae

The earthquake occurred about 76km north of  Batu Tara Volcano, located on the tiny Island of  Pulau Komba in the Banda Sea.

Historic Seismicity (Mag 7+ since 1900)

Banda Sea Ind SeisHis 1900
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Tsunami Report:

There was NO tsunami reported, possibly because the quake occurred at a depth  of more than 633km.

Related Links:

Posted in Batu Tara, earthquake forecast, Earthquakes, Pulau Komba, seismic activity, seismic event report | Tagged: , , , , , , | 2 Comments »

Powerful Quake Strikes Seabed Off W Indonesia

Posted by feww on August 16, 2009

A powerful earthquake measuring 6.7Mw strikes off the coast of western Indonesia

The powerful earthquake, originally reported as measuring 7.0Mw, struck in the Kepulauan Mentawai Region, Indonesia, about 110 km WSW of Padang, Sumatra, Indonesia, at a depth of 44.8km on Sunday August 16, 2009, USGS reported.

The earthquake, which was later downgraded by USGS EQ Hazard Program was followed by a cluster of  aftershocks at the time of writing, the largest of which measured 5.9Mw.

[ Note: FEWW Moderators have noted that at least a dozen or so earthquakes which were initially reported as measuring 6.0 or greater, have been subsequently downgraded by USGS without any explanation.  Moderators also noted an  earthquake reported in Alaska, which measured greater than 5.0, was withdrawn from the USGS report last week, again without any explanation.]

See also FEWW comments:

https://feww.wordpress.com/2009/08/03/magnitude-6-9-quake-strikes-gulf-of-california/#comment-3772

https://feww.wordpress.com/2009/08/03/magnitude-6-9-quake-strikes-gulf-of-california/#comment-3797

According to Indonesia’s Meteorological and Geophysics Agency there was NO tsunami warning.

Several people received minor injuries as they fled building in Padang, where a small number of buildings were damage, according to reports.

Earthquake Details

  • Magnitude: 6.7
  • Date-Time
    • Sunday, August 16, 2009 at 07:38:25 UTC
    • Sunday, August 16, 2009 at 02:38:25 PM at epicenter
  • Location: 1.397°S, 99.473°E
  • Depth: 44.8 km (27.8 miles)
  • Region:  KEPULAUAN MENTAWAI REGION, INDONESIA
  • Distances
    • 110 km (70 miles) WSW of Padang, Sumatra, Indonesia
    • 305 km (190 miles) SW of Pekanbaru, Sumatra, Indonesia
    • 560 km (345 miles) SSW of KUALA LUMPUR, Malaysia
    • 960 km (600 miles) WNW of JAKARTA, Java, Indonesia
  • Location Uncertainty: horizontal +/- 5.8 km (3.6 miles); depth +/- 10.2 km (6.3 miles)
  • Parameters: NST=240, Nph=240, Dmin=683.1 km, Rmss=1.04 sec, Gp= 22°, M-type=teleseismic moment magnitude (Mw), Version=8
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009kjak

10-degree Map Centered at 0°N,100°E

us2009kjak
Earthquake Location Map. Source: USGS

Historic Seismicity [USGS]

Historic Seismicity
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Seismic Hazard Map [USGS]
Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Related Links:

Posted in aftershocks, Kepulauan Mentawai, Pekanbaru, seismic activity, seismic hazard report | Tagged: , , , , | 4 Comments »

Mw 7.2 quake, aftershocks rock Indonesian island

Posted by feww on February 13, 2009

Magnitude 7.2 quake followed by dozens of strong aftershocks rattle the Indonesian island of Kepulauan Talaud

indonesia-quakes-feb-11-09

Earthquake Details

Magnitude: 7.2
Date-Time: Thursday, February 12, 2009 at 01:34:50 AM at epicenter
Location:  3.902°N, 126.400°E
Depth:  20 km (12.4 miles) set by location program
Region:  KEPULAUAN TALAUD, INDONESIA
Distances:

  • 280 km (175 miles) SSE of General Santos, Mindanao, Philippines
  • 320 km (195 miles) NNE of Manado, Sulawesi, Indonesia
  • 1320 km (820 miles) SSE of MANILA, Philippines
  • 2445 km (1520 miles) ENE of JAKARTA, Java, Indonesia

Location Uncertainty:  horizontal +/- 6.3 km (3.9 miles); depth fixed by location program
Source: USGS NEIC (WDCS-D)
USGS Event ID:  us2009cybb

Tectonic Summary [USGS]

The recent earthquake near Kepulauan Talaud, Indonesia of February 11, 2009 likely occurred as a result of reverse faulting on or near the plate-boundary system separating the Philippine Sea and Celebes Sea basins. Northeastern Indonesia is characterized by complex tectonics in which motions of numerous small plates are accommodating large-scale convergence between the Philippine Sea and Sunda plates. In the region of today’s earthquake, the Philippine Sea plate moves west-northwest with respect to the Sunda plate at a velocity of about 62 mm/year. Locally, arc-arc collision is occurring between the Sangihe and Halmahera micro plates, wedging between them the Molucca Sea micro plate, which subducts beneath both (i.e. to the east and west) and forms an inverted-U-shaped seismic zone. Seismicity within the Molucca Sea plate is active to depths of approximately 260 km to the east and 400 km to the west. The tectonic setting of this region is unique in that it is the only global example of an active arc-arc collision consuming an oceanic basin via subduction in two directions.

“The earthquake occurred approximately 30 km off the western coast of the Pulau Salebabu (Indonesia) in an area that has seen large earthquakes in the past. Since 1986, there have been two earthquakes with magnitude greater than 7 in this region.

Indonesia

Indonesia consists of more than 17,500 islands scattered over both sides of the equator, about 6,000 of which are inhabited.The five largest islands are Java, Sumatra, Kalimantan (the Indonesian side of Borneo), New Guinea (shared with Papua New Guinea) and Sulawesi.

Indonesian islands sit on the edges of the Australian, Eurasian and Pacific tectonic plates and are therefore subject to frequent earthquakes and volcanic eruptions. Indonesia is home to about 160 active volcanoes.

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