2004年东乌珠穆沁旗地震震源参数研究

地震 ›› 2008, Vol. 28 ›› Issue (3): 61-68.

2004年东乌珠穆沁旗地震震源参数研究

张爱萍^1,2, 倪四道^1,2, 杨晓勇²

1.蒙城地球物理国家野外科学观测研究站, 安徽蒙城 233500;
2.中国科学技术大学地球与空间科学学院, 合肥安徽 230026

收稿日期:2007-12-11 修回日期:2008-02-02 出版日期:2008-07-31 发布日期:2021-10-29
作者简介:张爱萍(1980-), 女, 河南沈丘人, 2005年在读硕士研究生, 主要从事壳幔速度结构、地震震源参数等研究。
基金资助:
自然科学杰出青年基金(40425005); 中国科学院知识创新项目(kzcx2-yw-116)

Source parameters of 2004-03-24 Xilin Gol League earthquake

ZHANG Ai-ping^1,2, NI Si-dao^1,2, YANG Xiao-yong²

1. Mengcheng National Geophysical Observatory, Mengcheng 233500;
2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received:2007-12-11 Revised:2008-02-02 Online:2008-07-31 Published:2021-10-29

摘要/Abstract

摘要： 利用波形反演方法, 研究并确定了2004年3月24日发生在内蒙古东乌珠穆沁旗与西乌珠穆沁旗交界处地震的震源机制及深度。近震波形对震源机制有很好的约束, 而远震体波对于震源深度分辨率很高, 因此综合利用了近震和远震波形数据。对于近震宽频带波形记录, 用CAP方法反演震源机制解。利用远震直达P波、 pP波和sP波的到时能较好的确定震源深度。综合利用近震宽频带波形和远震体波波形记录, 反演得出2004年03月24日地震为逆冲型, 震级为M_W5.3。其两个节面分别为: 节面I的走向、倾角、滑动角分别为147°、 22°、 87°, 节面Ⅱ的走向、倾角、滑动角分别为 330°、 68°、 91°; 震源深度为(12±2) km, 是一个典型的浅源上地壳地震。与前震序列对比, 节面Ⅰ是可能的发震构造。

关键词: 波形反演, 震源机制, 震源深度, 东乌珠穆沁旗地震

Abstract: Using waveform inversion method, we studied the focal mechanism and depth of 2004-03-24 earthquake occurred in Inner Mongolia (Latitude, Longitude ). Local waveform has better constraints on focal mechanism, while teleseismic waveform has high resolution on source depth. Both methods were employed to invert source parameters. Focal mechanism was inverted by CAP method. The inverted depth was confirmed by teleseismic P wave modeling. The earthquake is determined as a thrust event with focal planes as 330-68-91 and 147-22-87, magnitude of M_W5.3 and focal depth: 12 2 km. So, the earthquake occurred in upper crust instead of 30 km at depth as reported by many other papers.

Key words: Waveform inversion, Focal mechanism, Focal depth, Earthquake

中图分类号:

P315.7

张爱萍, 倪四道, 杨晓勇. 2004年东乌珠穆沁旗地震震源参数研究[J]. 地震, 2008, 28(3): 61-68.

ZHANG Ai-ping, NI Si-dao, YANG Xiao-yong. Source parameters of 2004-03-24 Xilin Gol League earthquake[J]. EARTHQUAKE, 2008, 28(3): 61-68.

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