天山北部强震活动对区域应力扰动的分析以2012年伊犁M6.6地震和2017年精河M6.6地震为例

Abstract

Abstract: In order to explore the influence of Moderate-Strong earthquake on the regional crustal deformation and seismic activity in Tian Shan, we calculated the coseismic and postseismic effects of the Yili M_S6.6 earthquake in 2012 and Jinghe M_S6.6 earthquake in 2017 on crustal deformation and stress, by adopting the elastic dislocation theory and the layered lithospheric model. The calculated results show that the both the M_S6.6 earthquakes lead to coseismic displacement in the magnitude of several centimeters and crustal deformation in the magnitude of 10^-7 within 80 km away from the epicenter. Compared with the annual average tectonic deformation characteristics in the northern Tianshan area, the M6.6 earthquakes release the accumulation of tectonic strain of nearly 10 years. The change of regional Coulomb stress is above 1 kPa near the epicenter within 80km, and is slight in the area far away from the epicenter. Combining the tectonic settings and seismic activity after the Jinghe earthquake, we find these two M_S6.6 earthquakes have a significant triggering effect on post-earthquake aftershocks near the epicenter, while the influences on regional deformation and seismic activity are comparatively small.

Key words: Tienshan region, Strong earthquakes greater than M6.0, Co-seismic and post-seismic effects, Crustal stress changes, Seismic activity

CLC Number:

P315.7

PANG Ya-jin, CHENG Hui-hong, DONG Pei-yu, SHI Yao-lin. Analysis of Regional Stress Disturbance Caused by Strong Earthquakes in Northern Tianshan: Taking 2012 Yili M6.6 Earthquake and 2017 Jinghe M6.6 Earthquakes as an Example[J]. EARTHQUAKE, 2019, 39(3): 127-137.

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Analysis of Regional Stress Disturbance Caused by Strong Earthquakes in Northern Tianshan: Taking 2012 Yili M6.6 Earthquake and 2017 Jinghe M6.6 Earthquakes as an Example

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