Fire Earth

Earth is fighting to stay alive. Mass dieoffs, triggered by anthropogenic assault and fallout of planetary defense systems offsetting the impact, could begin anytime!

Posts Tagged ‘Worldwide Earthquakes’

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.

Related Links:

Posted in China earthquake, earthquake report, Earthquakes, seismic activity report, Seismic event, Seismic Hazard | Tagged: , , , , , | 5 Comments »

Major Earthquakes Increase 47 % in 3 Decades

Posted by feww on December 13, 2008

Worldwide Earthquakes [Magnitude 6 to 9.9] have increased by 47 percent in under 3 decades

A total of  1,085 earthquakes measuring magnitude 6 or greater occurred between 1980 to 1989, averaging 109 per year over the decade. In the 1990s the decadal total increased to 1,492 averaging at 149 major earthquake  per year over the period.

Since January 1, 2000 [ see table below for the date and time] a total of 1,438 major earthquakes have so far occurred worldwide raising the annual total over the last 9 years to 160 with more than 12 and a half months to go to the decade’s end.

The increase from 109 to 160 major earthquakes per year in the 1980 to 2008 period translates to a rise  of 47 percent in just under three decades.

major-worldwide-earthquakes
Major Worldwide Earthquakes [Magnitude 6 to 9.9] – 1980 to 2008 – Source of data: USGS.

Other Data

With an estimated total death toll of 88,072 [as of Dec 3, 2008,] this year has seen the second worst number of human casualties caused by earthquakes since 1980. The largest earthquake/ tsunami related casualties for the 29-year period occurred in 2004 with an estimated total of 228,802 deaths.  [The stats are based on USGS data.

Related Links:

Posted in Earthquake Information, geology, Seismology, Subduction, Tectonic Boundaries | Tagged: , , , , | 5 Comments »