2011年5月20日山东安丘ML3.7地震发震断层参数测定

地震 ›› 2012, Vol. 32 ›› Issue (3): 52-58.

2011年5月20日山东安丘M_L3.7地震发震断层参数测定

李艳娥, 郭祥云, 王恒信, 陈学忠

中国地震局地球物理研究所, 北京 100081

收稿日期:2011-08-31 修回日期:2012-04-26 发布日期:2021-08-19
作者简介:李艳娥(1983-), 女, 河北沧州人, 地球物理学硕士, 主要从事数字地震学及地震预报等研究。
基金资助:
中国地震局地球物理研究所基本科研业务专项(DQJB10B22)

Fault Plane Determination for the 2011 M_L3.7 Anqiu Earthquake, Shandong Province

LI Yan'e, GUO Xiang-yun, WANG Heng-xin, CHEN Xue-zhong

Institute of Geophysics, CEA, Beijing 100081, China

Received:2011-08-31 Revised:2012-04-26 Published:2021-08-19

摘要/Abstract

摘要： 在一维单侧有限移动震源模式下, 根据拐角频率随方位的变化, 利用相关系数法研究了2011年5月20日山东安丘M_L3.7地震的发震断层面参数。结果表明, 这次地震的断层面破裂方向为112.2°, 与震源机制的EW向节面一致。地震马赫数v/c约为0.2695, 即平均破裂速度大约为S波速度的1/4。若取横波速度为3.5 km/s, 则破裂长度约为0.1162 km。

Abstract: By considering 1D finite moving source model propagating unilaterally, the corner frequency is employed to determine the azimuth of rupture propagation direction and the parameters of fault plane of the Shandong Anqiu M_L3.7 earthquake on May 20, 2011, by means of correlation coefficient method. The results show that the azimuth angle of the fault plane for this event is about 112.2°, consistent with the EW nodal plane of the focal mechanism solution. The seismic Mach number v/c is about 0.2695, which means that the average rupture velocity is about a quarter of the S-wave velocity. Given the velocity of S wave 3.5 km/s, the fault length is about 0.1162 km.

Key words: Corner frequency, Correlation coefficient method, Parameters of fault plane, Seismic Mach number

中图分类号:

P315.7

李艳娥, 郭祥云, 王恒信, 陈学忠. 2011年5月20日山东安丘M_L3.7地震发震断层参数测定[J]. 地震, 2012, 32(3): 52-58.

LI Yan'e, GUO Xiang-yun, WANG Heng-xin, CHEN Xue-zhong. Fault Plane Determination for the 2011 M_L3.7 Anqiu Earthquake, Shandong Province[J]. EARTHQUAKE, 2012, 32(3): 52-58.

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