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Journal of Mountain Science

, Volume 10, Issue 1, pp 84–94 | Cite as

Tectonic mechanism of the Suining (Ms5.0) earthquake, center of Sichuan Basin, China

  • Rong-jun Zhou
  • Yong LiEmail author
  • Laurence Svirchev
  • Yong-jiu Zhang
  • Deng-fa He
  • Yu-lin He
  • Pei-lin Zhao
  • Zan-jun Wang
  • Feng Long
  • Jin-rong Su
  • Shi-yuan Wang
  • Ming-jian Liang
  • Yu-fa Liu
  • Chuan-chuan Kang
Article

Abstract

On Jan. 31 of 2010, the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin. It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic environment and a low-level historical seismicity. The macro-epicenter of the earthquake is located at Moxi town of Suining city, Sichuan province, China. The earthquake intensity of the epicenter area is degree VII, and the long axis of the isoseismal line trends in NE orientation. The Suining earthquake caused the collapse or destruction of 460 family houses. The earthquake focal mechanism solution and records of the near-field seismographic stations showed the earthquake occurred at the reverse fault at a depth 3–4 km. Based on the waveform and focal mechanism, we consider the Suning earthquake is triggered by the reverse fault and not by the gravitational collapse or man-made explosive sources. Basing on seismic refraction profile and borehole, we consider that the earthquake is triggered by the backthrust fault of Moxi anticline rooted in detachments at a depth 3–4 km.Furthermore, we infer that tectonic mechanism of the Suining (Ms5.0) Earthquake is driven by the horizontal crustal shortening and stress adjustment on a shallow detachment after the Wenchuan (Ms 8.0) earthquake.

Keywords

Suining (Ms5.0) earthquake Disaster Tectonic mechanism Horizontal crustal shortening Backthrust fault Shallow detachment Sichuan Basin 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rong-jun Zhou
    • 1
  • Yong Li
    • 2
    Email author
  • Laurence Svirchev
    • 3
  • Yong-jiu Zhang
    • 1
  • Deng-fa He
    • 4
  • Yu-lin He
    • 1
  • Pei-lin Zhao
    • 5
  • Zan-jun Wang
    • 5
  • Feng Long
    • 1
  • Jin-rong Su
    • 1
  • Shi-yuan Wang
    • 1
  • Ming-jian Liang
    • 1
  • Yu-fa Liu
    • 1
  • Chuan-chuan Kang
    • 1
  1. 1.Earthquake Administration of Sichuan ProvinceChengduChina
  2. 2.National Key Laboratory of Oil and Gas Reservoir Geologyand ExploitationChengdu University of TechnologyChengduChina
  3. 3.Royal Roads University, School of Peace and Conflict ManagementVictoriaCanada
  4. 4.China University of GeoscienceBeijingChina
  5. 5.Earthquake Administration of Chongqing MunicipalityChongqingChina

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