2013年7月22日岷县MS6.6地震前后视应力研究

Abstract

Abstract: Based on waveform data observed by the regional seismic network of Gansu province, we calculated apparent stress of 422 M_L≥2.0 earthquakes occurred in the Minxian earthquake zone and its surrounding area from January 2010 to July 2014, obtained and analyzed temporal-spatial variations of apparent stress before and after Minxian earthquake. The results show that (1) high apparent stress of earthquakes with M_L≥4.0 is concentrated in the epicenter area while that of earthquakes with M_L<4.0 is distributed in the surrounding area before the Minxian earthquake. (2) Apparent stress in the epicenter area show an obvious increasing process before Minxian earthquake and the increasing process has continued after the earthquake, which may suggests that the study area is still in the danger of strong earthquake.

Key words: Apparent stress, Earthquake risk, The 2013 Minxian M_S6.6 earthquake

CLC Number:

P315.7

CHEN Li-juan, LI Yan-e, YANG Li-ming, CHEN Ji-feng, CHEN Xue-zhong. Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian M_S6.6 Earthquake[J]. EARTHQUAKE, 2015, 35(4): 30-42.

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Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian M_S6.6 Earthquake

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Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian MS6.6 Earthquake

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Temporal-spatial Variations of Apparent Stress before and after the 22 July 2013 Minxian M_S6.6 Earthquake