2013年芦山MS7.0地震震源区的地震波速度变化研究

Abstract

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

CLC Number:

P315.7

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

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Temporal Changes of Seismic Velocity in the Source Region before and after the 2013 Lushan MS7.0 Earthquake

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