1976 Songpan–Pingwu earthquake

1976 Songpan–Pingwu earthquake
UTC time  
  A: 1976-08-16 14:06:46
  B: 1976-08-21 21:49:53
  C: 1976-08-23 03:30:07
ISC event  
  A: 709871
  B: 710167
  C: 710223
USGS-ANSS  
  A: ComCat
  B: ComCat
  C: ComCat
Local date August 16, 22, and 23
Local time  
  A: 22:06 [1]
  B: 05:49 [2]
  C: 11:33 [3]
Magnitude  
  A: 6.7 Mw, 7.0 Ms[4]
  B: 6.3 Mw, 6.6 Ms[5]
  C: 6.4 Mw, 6.7 Ms[6]
Depth A: 8 km (5 mi)
B: 15 km (9 mi)
C: 19 km (12 mi)
Epicenter 32°41′N 104°12′E / 32.69°N 104.2°E / 32.69; 104.2Coordinates: 32°41′N 104°12′E / 32.69°N 104.2°E / 32.69; 104.2 [7]
Fault Huya[8]
Type Reverse and left-lateral [9]
Areas affected Songpan and Pingwu, Sichuan
Max. intensity VII[10]
Foreshocks Three year swarm

The 1976 Songpan–Pingwu earthquake struck Songpan and Pingwu in Sichuan, China. The earthquake was preceded by an earthquake swarm lasting three years. The mainshock occurred on August 16 at 14:06:47 UTC with a magnitude of 6.7 Mw. Several large aftershocks (6.7 and 7.2 Mw) occurred within several days [11]. During the period from August 16 to August 30, following the mainshock, there were over 400 aftershocks that were recorded with a magnitude greater than or equal to 3.0.[12]

Short term earthquake warning were issued 3 months before the earthquake[13]. There were 38 dead in the four counties being striked - Songpan, Pingwu, Maowen and Nanping. More than 5,000 houses collapsed and 2800 heads of livestock lost. [11].The earthquake was felt as far as Gaotai, Gansu to the west, Kunming, Yunnan to the south, Hohhot, Inner Mongolia to the north, and Changsha, Hunan to the east, an area with a max radius of 1150 kilometers (714 miles) [14]. The total casualties were 800, 600 of them slightly injured mostly due to mudslides[13]. The Earthquake Administration of Sichuan won the Chinese National Science and Technology Award of 1978 for successfully predicting the earthquake[15].

See also

Notes

  1. ↑ Jones et al. 1984, p. 7700.
  2. ↑ Jones et al. 1984, p. 7700.
  3. ↑ Jones et al. 1984, p. 7701.
  4. ↑ ISC-EHB Event 70987 [IRIS].
  5. ↑ ISC-EHB Event 70987 [IRIS].
  6. ↑ ISC-EHB Event 70987 [IRIS].
  7. ↑ ISC-GEM Event 709781 [IRIS].
  8. ↑ Jones et al. 1984, p. 7697.
  9. ↑ Jones et al. 1984, p. 7697.
  10. ↑ ANSS: Sichuan 1976a.
  11. 1 2 "Major earthquakes on Chinese mainland since 1966". Consulate-General of the People's Republic of China in Sydney.
  12. ↑ Jones et al. 1984.
  13. 1 2 "Past successful Chinese earthquake predictions". Liaoning Earthquake Administration.
  14. ↑ Xinhua News Agency. "Earthquake with scale 6 or higher Since 1976". China Earthquake Administration.
  15. ↑ "30th anniversary of the Songpan–Pingwu earthquake". Sichuan Earthquake Administration.

Sources

  • ANSS, "Sichuan 1976a: M 6.9 - Sichuan-Gansu border region, China", Comprehensive Catalog, U.S. Geological Survey .
  • ANSS, "Sichuan 1976b: M 6.4 - Sichuan-Gansu border region, China", Comprehensive Catalog, U.S. Geological Survey .
  • ANSS, "Sichuan 1976c: M 6.7 - Sichuan-Gansu border region, China", Comprehensive Catalog, U.S. Geological Survey .
  • International Seismological Centre, ISC-EHB Bulletin, Thatcham, United Kingdom, http://www.isc.ac.uk/ .
  • International Seismological Centre, ISC-GEM Global Instrumental Earthquake Catalogue, Thatcham, United Kingdom, http://www.isc.ac.uk/ .
  • Jones, L. M.; Han, W.; Hauksson, E.; Jin, A.; Zhang, Y.; Luo, Z. (1984), "Focal mechanisms and aftershock locations of the Songpan earthquakes of August 1976 in Sichuan, China" (PDF), Journal of Geophysical Research, 89 (B9): 7697–7707, Bibcode:1984JGR....89.7697J, doi:10.1029/jb089ib09p07697 .


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