2013年芦山MS7.0地震震源区的地震波速度变化研究

地震 ›› 2015, Vol. 35 ›› Issue (3): 57-65.

2013年芦山M_S7.0地震震源区的地震波速度变化研究

周晨, 周连庆, 张正帅, 赵翠萍

中国地震局地震预测研究所, 北京 100036

收稿日期:2015-03-13 出版日期:2015-07-31 发布日期:2020-06-28
作者简介:周晨(1989-), 女, 辽宁瓦房店人, 在读硕士研究生, 主要从事数字地震学研究。
基金资助:
中国地震局地震预测研究所基本科研业务专项(2013IES010104, 2011IES010104)资助

Temporal Changes of Seismic Velocity in the Source Region before and after the 2013 Lushan M_S7.0 Earthquake

ZHOU Chen, ZHOU Lian-qing, ZHANG Zheng-shuai, ZHAO Cui-ping

Institute of Earthquake Science, CEA, Beijing 100036, China

Received:2015-03-13 Online:2015-07-31 Published:2020-06-28

摘要/Abstract

摘要： 本文利用四川区域台网的连续波形记录, 研究了2013年4月20日四川芦山地震前后震源区不同路径上介质速度的变化过程。结果显示, 在地震发生前, 本文使用的穿过震源区的所有路径上未能观测到速度变化, 而几个台站对(SMI-YZP、 XJI-EMS、 WCH-MDS)之间的路径上, 在地震发生后存在速度的快速减小, 量级为0.4%, 速度快速减小过程持续时间很短。只有少量台站对观测到速度变化, 表明芦山地震震源区介质变化不显著。

关键词: 背景噪声, 速度变化, 2013年芦山M_S7.0地震

Abstract: In this paper,we researched the temporal changes of different paths on medium speed before and after the Lushan earthquake on April 20, 2013, using continuous waveforms recorded by the Sichuan regional stations.The results show that, before the earthquake, we didn't observe speed changes on all the paths covering the focal region. It is the same as the cases of tectonic earthquakes above magnitude 6 that seismologists studied using the same method at home and abroad. After the earthquake, the velocity reduces rapidly on the paths of station pairs crossed the focal region, and the order of magnitude reaches 0.4%.This situation lasts for two months to disappear.

Key words: Ambient noise, Velocity change, The 2013 Lushan M_S7.0 earthquake

中图分类号:

P315.7

周晨, 周连庆, 张正帅, 赵翠萍. 2013年芦山M_S7.0地震震源区的地震波速度变化研究[J]. 地震, 2015, 35(3): 57-65.

ZHOU Chen, ZHOU Lian-qing, ZHANG Zheng-shuai, ZHAO Cui-ping. Temporal Changes of Seismic Velocity in the Source Region before and after the 2013 Lushan M_S7.0 Earthquake[J]. EARTHQUAKE, 2015, 35(3): 57-65.

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