基于 CAP 方法的震源机制研究

长江科学院院报 ›› 2010, Vol. 27 ›› Issue (5): 81-84.

基于 CAP 方法的震源机制研究

赵凌云¹ , 邓津², 陈俊华¹ , 申学林¹ , 戴苗¹ , 魏贵春¹

1. 湖北省地震局，武汉 430071 ； 2. 甘肃省地震局，兰州 730000

出版日期:2010-05-01 发布日期:2010-05-01

Study on Source Mechanism of Ms 4.1 and Ms 3.2 Earthquakes in Hubei-Zigui with CAP Method

ZHAO Ling-yun¹ ， DENG Jin² ， CHEN Jun-hua¹ ， SHEN Xue-lin¹ ， DAI Miao¹ ， WEI Gui-chun¹

1.Earthquake Administration of Hubei Province, Wuhan 430071 ， China ； 2. Earthquake Administration of Gansu Province, Lanzhou 730000 ,China

Published:2010-05-01 Online:2010-05-01

摘要/Abstract

摘要： 利用来源于湖北区域台网共 6 个台的宽频带数字地震记录，采用 CAP 法 (Cut and Paste Method) 反演了 2008 年 11 月 22 日湖北 - 秭归 Ms4.1 级地震和 09 月 27 日 Ms3.2 中小震的震源机制解。结果显示， 2 次地震的震源机制解有一些差别，但是均为逆冲兼走滑分量性质断层，主压应力 P 轴主要集中在 NE 向，与区域主压应力方向有一定一致性。分析认为秭归地震可能是仙女山断裂受库水渗透和载荷变化影响引发的水库构造地震。通过与 P 波初动地震震源机制结果对比发现，该地震的震源机制的反演结果有较好的一致性，结果较可信。

关键词: 秭归地震, 震源机制解 , CAP 法 (Cut and Paste Method

Abstract: On the basis of the records of 6 stations in Hubei regional seismic network ， we obtained the focal mechanisms of the Ms 4.1 and Ms3.2 earthquakes in Zigui on Nov.22,2008 and Sep.27,2008, respectively with the Cut and Paste(CAP) method. The result shows that earthquakes have strike-slip and strike-slip fault mechanisms and the orientations of maximum compressional stresses are mainly in NE. It is certainly consistent with the orientation of the regional maximum compressional stresses .We deduce the earthquake is the reservoir induced earthquake by water permeation and dynamic changes load.The comparison shows that the focus mechanism of two events presented in this paper is consistent with that of small  moderate earthquakes determined by P-wave first-motion.

Key words: Zigui earthquake , focus mechanism solution , CAP method

中图分类号:

P315.6

赵凌云 , 邓津 , 陈俊华 , 申学林 , 戴苗 , 魏贵春. 基于 CAP 方法的震源机制研究[J]. 长江科学院院报, 2010, 27(5): 81-84.

ZHAO Ling-yun1 ， DENG Jin， CHEN Jun-hua ， SHEN Xue-lin ， DAI Miao ， WEI Gui-chun. Study on Source Mechanism of Ms 4.1 and Ms 3.2 Earthquakes in Hubei-Zigui with CAP Method[J]. Journal of Changjiang River Scientific Research Institute, 2010, 27(5): 81-84.