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Posts Tagged ‘Earthquake Clusters’

Deadly 7.0Mw Quake Strikes N. Qinghai, China

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.

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Posted in China earthquake, earthquake, earthquake report, Northern Qinghai quake, Seismic Hazard | Tagged: , , , , | 2 Comments »

Strong EQ Strikes Northern Qinghai, China

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

N QINGHAI, CHINA
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)

qinghai seismic hist
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: , , , , , | 5 Comments »

Another Deadly Earthquake Cluster Hits China

Posted by feww on August 31, 2008

China quake damages more than 100,000 homes, 25 dead

Revised figures in brackets are from a more recent report by AP.

BEIJING, Aug 31 (Reuters) – An earthquake that hit southwest China’s Sichuan and Yunnan provinces has killed [32] people [another 467 people injured], damaged or destroyed more than 258,000 homes and affected at least 600,000 residents [about 152,000 were evacuated,] state media said on Sunday.


Li Fucui, 47, cries in front of the debris of her collapsed house, which buried her brother-in-law, in Huili County, Sichuan Province. (Image: Reuters). Image may be subject to copyright.

The epicenter of Saturday’s quake, which struck around 4:30 p.m. (0730 GMT), was about 20 miles (30 km) southeast of Panzhihua, near Sichuan’s border with Yunnan, according to the U.S. Geological Survey. The quake was about 6 miles (10 km) deep.

The USGS put the magnitude of the quake at 5.7, while China’s official Xinhua news agency said it measured 6.1.

A 5.6-magnitude aftershock hit the same area 24 hours later, the USGS said on Sunday. There were no immediate reports of further damage.

Xinhua said Saturday’s quake had injured more than 250 people, and three more were missing.

It added that 656 schools had also been damaged and that heavy rain and difficult terrain were hampering rescue efforts, with mobile telephone communications patchy.

State television showed pictures of houses with large cracks in their sides, broken tiles on the road and people receiving medical attention under tents.

The government was rushing disaster relief to the affected areas, including thousands of tents and blankets and tonnes of food and water, Xinhua said.

Parts of Sichuan province were devastated by an earthquake that killed about 70,000 people in May. The province, known for its pandas and fiery cuisine, has struggled to rebuild after the disaster, which left 10 million people homeless. (Reporting by Ben Blanchard; Editing by Alex Richardson)

China should prepare for another massive earthquake in the Sichuan and Yunnan border area this winter!

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