Quantitative analysis of Lushan earthquake background activity with earthquake multi-parameters

doi:10.7523/j.issn.2095-6134.2015.02.013

Abstract

Abstract:

The M_s7.0 Lushan earthquake occurred in the southern part of Longmenshan fault on 20 April 2013. We calculate several kinds of seismic activity parameters to analyze the background activity of Lushan earthquake and relate them with Wenchuan earthquake. The results show that 1) there were only three great earthquakes above M6.0 occurring in the southern part of Longmenshan fault, which indicates existence of earthquake gap in historic earthquake background; 2) based on the values of a, the background earthquake activity was high during the 30 years before Lushan earthquake; and 3) the spatial difference in b-value before and after Wenchuan earthquake shows decrease of b-value and increase of stress only in part of southern Longmenshan fault zone while Lushan earthquake occurred in the region where b-value decreased apparently.

Key words: Lushan earthquake, earthquake activity, a-value, b-value

CLC Number:

P315.08

WANG Jingjing, ZHANG Huai, PANG Yajin, SHI Yaolin. Quantitative analysis of Lushan earthquake background activity with earthquake multi-parameters[J]. , 2015, 32(2): 235-242.

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