Pure and Applied Geophysics

, Volume 174, Issue 6, pp 2257–2267 | Cite as

Stress Distribution Near the Seismic Gap Between Wenchuan and Lushan Earthquakes

  • Yihai Yang
  • Chuntao Liang
  • Zhongquan Li
  • Jinrong Su
  • Lu Zhou
  • Fujun He
Article
  • 249 Downloads

Abstract

The Wenchuan M S 8.0 earthquake and Lushan M S 7.0 earthquake unilaterally fractured northeastward and southwestward, respectively, along the Longmenshan fault belt. The aftershock areas of the two earthquakes were separated by a gap with a length of nearly 60 km. We have determined the focal mechanisms of 471 earthquakes with magnitude M ≥ 3 from Jan 2008 to July 2014 near the seismic gap using a full waveform inversion method. Normal, thrust and strike-slip focal mechanisms can be found in northern segment. But in a significant contrast, focal mechanisms of the earthquakes in the southern segment are dominated by thrust faulting. Based on the determined source parameters, we further apply a damped linear inversion method to derive the regional stress field. The southern segment is characterized by an obvious thrust faulting stress regime with a nearly horizontal maximum compression that orients in SE–NW direction. The stress environment in the northern segment is a lot more complicated. The maximum compressional stresses appear to rotate around the “asperity” near west of the Dujiangyan city. Stress field also shows strong variation with time and depth. Before 2009, the seismic activities are more concentrated on the Pengxian–Guanxian fault and Yingxiu–Beichuan fault with dominant strike-slip faulting and normal faulting, while after 2009, the seismic activities are dominated by thrust faulting from north to south, while the activities are more concentrated on the Wenchuan–Maoxian fault in northern segment and Pengxian–Guanxian fault in southern segment. The maximum compressional stresses vary in different depths from north to south, thus may imply the decoupled movement in shallow and in depth.

Keywords

Wenchuan earthquake Lushan earthquake seismic gap focal mechanism stress field 

Notes

Acknowledgments

We appreciate Mian Liu and one anonymous reviewer for their constructive comments and suggestions that have helped to improve this paper. This work was partially supported by National Natural Science Foundation of China (41340009), Sichuan Science and Technology Support Plan (2015RZ0032, 2015SZ0224) and the Creative Team Plan of Chengdu University of Technology.

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Copyright information

© Springer International Publishing 2016

Authors and Affiliations

  • Yihai Yang
    • 1
    • 2
  • Chuntao Liang
    • 1
    • 2
  • Zhongquan Li
    • 3
    • 4
  • Jinrong Su
    • 5
  • Lu Zhou
    • 1
    • 2
  • Fujun He
    • 1
    • 2
  1. 1.State Key Laboratory of Geohazard Prevention and Geoenviroment ProtectionChengdu University of TechnologyChengduChina
  2. 2.Key Laboratory of Earth Exploration and Information Technique of Education Ministry of ChinaChengdu University of TechnologyChengduChina
  3. 3.State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationChengdu University of TechnologyChengduChina
  4. 4.Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir, Ministry of Land and ResourcesChengdu University of TechnologyChengduChina
  5. 5.Earthquake Administration of Sichuan ProvinceChengduChina

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