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Posts Tagged ‘Earthquake cluster’

Significant Quake Strikes Near Stroud, Oklahoma

Posted by feww on July 14, 2017

AIS-661K

M4.2 Earthquake Strikes 13km NNW of Stroud, Oklahoma

The quake was followed by a cluster of aftershocks. More than 1,650 “felt” reports were received by USGS, as of this alert.

EQ Details:
Magnitude: 4.2 mwr
Location: 35.869°N, 96.697°W [13km NNW of Stroud, Oklahoma]
Depth: 9.3 km
Time: 13:47:35 UTC 2017-07-14

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Intense Seismicity Continues Near Tanaga Volcano (US-AK)

Posted by feww on May 10, 2017

G-113E

Strong aftershock occurs near Tanaga Volcano

The aftershock was one of dozens to follow the strong quake that struck the area on June 8. 

Earthquake Details:

M 5.9 [USGS]
51.680°N, 178.383°W [28km SW of Tanaga Volcano, Alaska]
10.0 km depth
2017-05-10 07:59:57 UTC

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Intense Seismicity Occurring Near Tanaga Volcano (US-AK)

Posted by feww on May 9, 2017

G-057k

Magnitude 6.2 earthquake strikes WSW of Tanaga Volcano, Alaska

The strong quake was followed by dozens of aftershocks, but it did NOT generate a destructive tsunami.

Earthquake Details:

M 6.2 [USGS]
51.755°N, 178.636°W [ 37km WSW of Tanaga Volcano, Alaska ]
10.0 km depth
2017-05-08 17:00:47 UTC

  • Seismic analysis and forecast are available from FIRE-EARTH PULSARS.

List of Aftershocks ≥ M4.5:

M4.5
30km SSW of Tanaga Volcano, Alaska; 2017-05-08 23:43:57 (UTC); 38.0 km

M4.5
38km S of Tanaga Volcano, Alaska; 2017-05-08 22:22:28 (UTC); 10.0 km

M4.9
38km SW of Tanaga Volcano, Alaska; 2017-05-08 21:53:08 (UTC); 10.0 km

M4.5
31km SW of Tanaga Volcano, Alaska; 2017-05-08 21:52:45 (UTC); 9.4 km

M4.6
35km SW of Tanaga Volcano, Alaska; 2017-05-08 21:25:22 (UTC); 10.0 km

M4.7
32km SW of Tanaga Volcano, Alaska; 2017-05-08 20:39:50 (UTC); 10.0 km

M4.8
36km SSW of Tanaga Volcano, Alaska; 2017-05-08 20:23:15 (UTC); 29.0 km

M5.0
34km SSW of Tanaga Volcano, Alaska; 2017-05-08 19:53:19 (UTC); 10.0 km

M4.6
39km SW of Tanaga Volcano, Alaska; 2017-05-08 17:39:17 (UTC); 10.0 km

M5.2
32km WSW of Tanaga Volcano, Alaska; 2017-05-08 17:08:33 (UTC); 10.0 km

M6.2
37km WSW of Tanaga Volcano, Alaska; 2017-05-08 17:00:47 (UTC); 10.0 km

M5.9
88km SSW of Adak, Alaska; 2017-05-08 15:47:30 (UTC); 22.8 km

M5.7
94km SSW of Adak, Alaska; 2017-05-08 15:31:26 (UTC); 17.0 km

M4.5
37km SW of Tanaga Volcano, Alaska; 2017-05-03 18:45:12 (UTC); 4.9 km

 

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FIRE-EARTH Seismic Alert – C. Italy – Update #2

Posted by feww on January 18, 2017

Central Italy EQC: Seismicity Continues

M5.2  – 4km N of Montereale, Italy 2017-01-18 13:33:37 (UTC) 6.9 km
M4.1  – 7km WNW of Amatrice, 2017-01-18 12:01:41 (UTC) 10.0 km
M4.7  –  2km SSW of Arquata del Tronto, 2017-01-18 11:07:39 (UTC) 10.0 km
M4.3  – 7km NNW of Montereale, 2017-01-18 10:39:24 (UTC) 10.0 km
M5.6  – [42.600°N, 13.232°E;] 5km WSW of Amatrice, 2017-01-18 10:25:25 (UTC) 10.0 km
M4.5  –  10km NW of Montereale, 2017-01-18 10:24:16 (UTC) 10.0 km
M4.6  –  0km ENE of Montereale, 2017-01-18 10:16:37 (UTC) 10.0 km
M4.7  –  4km SSE of Amatrice, 2017-01-18 10:15:32 (UTC) 10.0 km
M5.7  –  5km WSW of Amatrice, 2017-01-18 10:14:11 (UTC) 10.0 km
M5.3  –  7km WNW of Amatrice, Italy 2017-01-18 09:25:41 (UTC) 10.0 km
[USGS/EHP – FEWWR: Grace]

  • Seismic analysis and forecast are available from FIRE-EARTH PULSARS.

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M4.8, M4.7 among 19 Earthquakes Striking Oklahoma

Posted by feww on January 7, 2016

Oklahoma Rattled by 19 Quakes

The largest events in the cluster that struck earlier today measured magnitudes 4.8 and 4.7Mw.

  • M4.8 occurred at 36.493°N, 98.714°W about 32km NW of Fairview, Oklahoma 2016-01-07 04:27:58 UTC depth=6.0 km
  • M4.7 31km occurred at 36.475°N 98.728°W about NW of Fairview, Oklahoma 2016-01-07 04:27:28 UTC depth=3.4 km

List of all EQs in Oklahoma today

4.0 about 27km NW of Fairview, Oklahoma 2016-01-07 08:37:11 UTC 5.0 km
3.7 about 30km NW of Fairview, Oklahoma 2016-01-07 08:06:15 UTC 5.0 km
3.3 about 31km NW of Fairview, Oklahoma 2016-01-07 08:02:31 UTC 6.7 km
2.5 about 33km NW of Fairview, Oklahoma 2016-01-07 07:50:03 UTC 7.9 km
2.8 about 5km ENE of Edmond, Oklahoma 2016-01-07 06:42:57 UTC 7.8 km
3.5 about 32km NW of Fairview, Oklahoma 2016-01-07 06:38:34 UTC 8.4 km
2.6 about 30km NW of Fairview, Oklahoma 2016-01-07 06:20:18 UTC 1.2 km
3.2 about 31km S of Alva, Oklahoma 2016-01-07 06:03:28 UTC 5.0 km
3.0 about 31km NW of Fairview, Oklahoma 2016-01-07 05:37:48 UTC 3.9 km
3.3 about 25km NNW of Fairview, Oklahoma 2016-01-07 05:19:48 UTC 5.0 km
3.4 about 30km NW of Fairview, Oklahoma 2016-01-07 04:49:47 UTC 5.0 km
3.4 about 33km S of Alva, Oklahoma 2016-01-07 04:37:22 UTC 5.0 km
4.8 about 32km NW of Fairview, Oklahoma 2016-01-07 04:27:58 UTC 6.0 km
4.7 about 31km NW of Fairview, Oklahoma 2016-01-07 04:27:28 UTC 3.4 km
3.2 about 6km ENE of Edmond, Oklahoma 2016-01-07 02:15:07 UTC 5.0 km
2.5 about 5km ENE of Edmond, Oklahoma 2016-01-07 01:20:55 UTC 7.3 km
3.7 about 30km NW of Fairview, Oklahoma 2016-01-06 15:26:12 UTC 4.8 km
2.8 about 6km ENE of Edmond, Oklahoma 2016-01-06 12:51:12 UTC 5.0 km
2.9 about 26km WSW of Medford, Oklahoma 2016-01-06 10:40:29 UTC 5.0 km

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Earthquake Cluster Strikes NW of Sabang, Indonesia

Posted by feww on November 9, 2015

M6.4, largest of 17 earthquakes, occurs 128km NW of Sabang, Indonesia

Centered at 6.846°N, 94.661°E the quake struck at a depth of 10.0km, USGS/EHP reported.

Nearby Cities

128km (80mi) NW of Sabang, Indonesia
160km (99mi) NNW of Banda Aceh, Indonesia
216km (134mi) NW of Sigli, Indonesia
254km (158mi) NW of Reuleuet, Indonesia
880km (547mi) WNW of Kuala Lumpur, Malaysia

The cluster comprised of at least 17 shocks, as of posting, measuring 4.6Mw or greater and occuring at an an average depth of about 10km.

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M4.4 Quake Strikes near Medford, Oklahoma

Posted by feww on October 10, 2015

More earthquakes strike Oklahoma

The largest of five earthquake to strike Oklahoma, and the Kansas border area, in a 12-hour period to 09:20:43 UTC today, measured 4.4Mw.

Centered at 36.707°N, 97.906°W (about 18km SW of Medford, Oklahoma) the quake occurred at a depth of 6.4 km, reported USGS/EHP.

At least 153 earthquakes measuring ≥ 2.5Mw have occurred in the State of Oklahoma and the Kansas border area in the past 30 days.

Related Links

 

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Super Clusters of Low-Level Seismicity Could Swamp Oklahoma

Posted by feww on July 15, 2015

VHF bursts of earth tremors could significantly affect Oklahoma: FIRE-EARTH Forecast

Fire-Earth Models show recurring swarms of intense seismicity, very large bursts of tremors striking repeatedly, could plague the State of Oklahoma.

EoF.

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Significant Aftershocks Continue to Rock Aleutian Islands

Posted by feww on August 31, 2013

8 significant aftershocks strike Aleutian Islands, following M7.0 quake

At least 8 significant aftershocks, measuring 5.0Mw or larger, were among a swarm of dozen quakes that hit Aleutian Islands, Alaska, following a powerful 7.0 mainshock that occurred ESE of Adak, Alaska earlier today.

West Coast and Alaska Tsunami Warning Center said there was no tsunami advisory, watch or warning in effect after the mainshock.

The M7.0 quake struck about 94km (58mi) ESE of Adak, Alaska and was strongly felt in Adak, about 2,000km southwest of Anchorage, according to reports.

There was no report of major damage or injuries, as of posting.

M7 adak alaska
Earthquake location Map. Source: USGS/EHP

Details of Mainshock

  • Event Time: 2013-08-30 16:25:02 UTC
  • Location: 51.610°N 175.361°W depth=33.5km (20.8mi)
  • Nearby Cities
    • 94km (58mi) ESE of Adak, Alaska
    • 1,520km (944mi) SSE of Anadyr’, Russia

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Earthquake Cluster Hits Yellowstone National Park

Posted by feww on December 31, 2008

More than two dozen earthquakes magnitude 2.5 and larger strike Yellowstone National Park, Wyoming

FEWW Forecast: There could be as much as 37 percent more earthquakes in the United States in 2009;  some may occur in areas not prone to quakes, e.g., north, northeast, south and central U.S.

Magnitude 3.5 quake strikes  YELLOWSTONE NATIONAL PARK, WYOMING

Source: USGS

This Earthquake
Magnitude: 3.5

Date-Time:

  • Wednesday, December 31, 2008 at 09:02:28 UTC
  • Wednesday, December 31, 2008 at 02:02:28 AM at epicenter

Location: 44.523°N, 110.362°W
Depth: 0.4 km (~0.2 mile) (poorly constrained)
Region: YELLOWSTONE NATIONAL PARK, WYOMING
Distances:

  • 61 km (38 miles) ESE (104°) from West Yellowstone, MT
  • 64 km (40 miles) SSE (154°) from Gardiner, MT
  • 64 km (40 miles) SSW (211°) from Cooke City-Silver Gate, MT
  • 437 km (272 miles) NNE (16°) from Salt Lake City, UT

Location Uncertainty: horizontal +/- 0.5 km (0.3 miles); depth +/- 7.9 km (4.9 miles)
Source: University of Utah Seismograph Stations [via USGS]
Event ID: uu00002649

FEWW Team will provide a more definitive earthquake forecast for the US in 2009 once it’s had a chance to re-examine the data to confirm the preliminary analysis.

Posted in earthquake, Gardiner, Salt Lake City, Seismicity, subduction zone | Tagged: , , , , | 2 Comments »

Powerful Quake, Strong Aftershocks Hit China’s W. Xizang

Posted by feww on August 31, 2008

Earthquake UPDATE

USGS has reported an earthquake cluster striking Western Xizang area. The 6.7 Mainshock which struck about 225 km (140 miles) NE of Jumla, Nepal on August 25, 2008, was followed by at least five powerful aftershocks measuring magnitude 5 or higher.

A Note of Interest

The mainshock, which struck the area on August 25 at 09:21:59 PM (time at epicenter), was located at 30.893°N, 83.614°E. Those coordinates put the epicenter in the eastern section of Palung Co lake in  the western Xizang province, Tibet Autonomous Region (China).

An examination of the images of Palung Co reveals that the lake, especially its southern section formation, is a large caldera formed either by multiple caldera collapse events or by a large lateral sector collapse. See Google Earth [30° 49’N, 83° 34’E] for visual confirmation.

The discovery gives rise to a number of interesting questions including the date for last eruption in the-now-sunken calderas, and the probability of renewed volcanic eruptions occurring as a result of the powerful seismic activity in the area.



Images: USGS

Quake Magnitude: 6.7
Date & Time:

  • Monday, August 25, 2008 at 13:21:59 UTC
  • Monday, August 25, 2008 at 09:21:59 PM at epicenter

Location: 30.893°N, 83.614°E
Depth: 12 km (7.5 miles) set by location program
Region: WESTERN XIZANG
Distances:

  • 225 km (140 miles) NE of Jumla, Nepal
  • 295 km (185 miles) N of Pokhara, Nepal
  • 370 km (230 miles) NNE of Nepalganj, Nepal
  • 390 km (245 miles) NNW of KATHMANDU, Nepal

Location Uncertainty: horizontal +/- 7.9 km (4.9 miles); depth fixed by location program (Source of data: USGS)

Posted in China, Human-enhanced natural catastrophes, mainshock, Tibet Autonomous Region, Uncategorized | Tagged: , , , , , , , , | 1 Comment »

No End Seen to China Quake Aftershocks

Posted by feww on May 16, 2008

Another major earthquake in the making?

China Earthquake: Large Cluster of Powerful Shocks!

  • Mainshock: 7.9 Magnitude – Monday, May 12, 2008 at 02:28:01 [time at epicenter]
  • Latest aftershock: 5.5 Magnitude – Friday, May 16, 2008 at 01:25:48 PM [time at epicenter]
  • Total number of major aftershocks: 59 [and continuing]

The last 4 aftershocks have strengthened in magnitude from 4.3 to 5.5 Mw. Is there another major shock in the making?

This map shows the predicted (theoretical) travel times, in minutes, of the compressional (P) wave from the earthquake location to points around the globe. The heavy black lines shown are the approximate distances to the P-wave shadow zone (103 to 140 degrees). (Caption: USGS)

Shadow zone

The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.

Did you know?

Through measuring how P and S waves travel through the earth and out the other side, a seismic wave shadow zone was discovered in about 1910. From the lack of S waves and a great slowing of the P wave velocity (by about 40%) it was deduced that the outer core is made of liquid. The shadow zone also defined the diameter of the core.

[If the outer core was not made of liquid, Earth could probably breakup into several pieces as a result of a v. large earthquake! FEWW]

Text and image: USGS.

Posted in Beijing, beijing olympics, China, Chinese, civilization, clean water, coal mining, collapse, Collapsing Cities, energy, environment, health | Tagged: , , , , , , , , , , , , , , , , | Leave a Comment »

How Many More Survivors?

Posted by feww on May 16, 2008

The Clueless Wen Jiabao: “Most wide-spreading impact”

Chinese PM, Wen Jiabao, was quoted as saying that the 7.9-magnitude quake that hit southwestern Sichuan province on Monday had the “most wide-spreading impact” of any earthquake since the People’s Republic of China was founded in 1949, Xinhua news agency quoted Wen as saying.

[Note, for reasons unknown to FEWW moderators, the earthquake cluster’s mainshock was previously reported as magnitude 7.8, erroneously!]


The aftermath of a large earthquake cluster. (Credit: Reuters/Jason Lee) Image may be subject to copyright. See FEWW Fair Use Notice!

Related Links:

MORE lINKS:

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Quake Aftershocks Hit China

Posted by feww on May 13, 2008

Update #2 – China Quake

A Cluster of 28 Aftershocks Strike Eastern Sichuan, China

According to USGS, a cluster of 22 aftershocks measuring 4.8 and 6.0 in magnitude have struck the EASTERN SICHUAN region, China, in the 18-hour period since the mainshock devastated several townships in the region.


Bigger earthquakes have more and larger aftershocks. The bigger the main shock the bigger the largest aftershock will be, on average. The difference in magnitude between the main shock and largest aftershock ranges from 0.1 to 3 or more, but averages 1.2 (a M5.5 aftershock to a M6.7 main shock for example). There are more small aftershocks than large ones. Aftershocks of all magnitudes decrease at the same rate, but because the large aftershocks are already less frequent, the decay can be noticed more quickly. Large aftershocks can occur months or even years after the main shock. (Source: USGS)


A rescuer searches for victims after an earthquake in Chongqing municipality, May 12, 2008. REUTERS/Stringer. Image may be subject to copyright. See FEWW Fair Use Notice.

Related Links:

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