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Posts Tagged ‘mining related earthquake’

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)
  • 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

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)
  • 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 »

Mining sets off earthquake in Poland

Posted by feww on August 7, 2009

Magnitude 4.1 Quake Strikes Near Lubin Copper Mine NW of Wroclaw, Poland

The earthquake struck at a depth of 5km close to Poland’s Lubin underground copper [and silver mine] about 85km NW of Wroclaw, Poland.

In June 2008, an earthquake measuring 4.7Mw, the largest of a swarm that has hit the mining area since 1990 [see Historic Seismicity below,] occurred at an identical depth of 5km.

10-degree Map Centered at 50°N,20°E

lubin quake
Earthquake location map. Source: USGS

Earthquake Details

  • Magnitude: 4.1
  • Date-Time:
    • Friday, August 07, 2009 at 03:33:18 UTC
    • Friday, August 07, 2009 at 05:33:18 AM at epicenter
  • Location: 51.623°N, 16.151°E
  • Depth: 5 km (3.1 miles) set by location program
  • Region: POLAND
  • Distances
    • 85 km (50 miles) NW of Wroclaw, Poland
    • 100 km (65 miles) SSW of Poznan, Poland
    • 125 km (80 miles) E of Cottbus, Germany
    • 340 km (210 miles) W of WARSAW, Poland
  • Location Uncertainty:  horizontal +/- 5.5 km (3.4 miles); depth fixed by location program
  • Parameters:  NST= 25, Nph= 25, Dmin=142.4 km, Rmss=0.84 sec, Gp= 40°, M-type=body wave magnitude (Mb), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009kaaf

Historic Seismicity

neic_kaaf_s lubin hist
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS

Note: the swarm in the center of image relates to the mining activity in the Lubin area. The second swarm of quakes in the image seen on the right [SE of Wroclaw, Poland, ] relates to the coal mining activity in the coal-rich region which extends from the Ostrava coal field in the Czech Republic to the south all the way to the Wujek coal field in Poland to the NW of the region.

neic_kaaf_w - lubin
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS

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Posted in Earthquakes, Lubin quake, Poland, Wroclaw, Wujek coal mine | Tagged: , , , , | 6 Comments »