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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。
In this paper, the continuous waveforms of the Sichuan regional network are used to study the change of medium velocities on different paths in the source region before and after the Lushan earthquake in Sichuan Province on April 20, 2013. The results show that before the earthquake, no velocity changes were observed on all paths through the source region used in the present study, whereas the path between several station pairs (SMI-YZP, XJI-EMS, WCH-MDS) , There is a rapid decrease in velocity after the earthquake, on the order of 0.4%, and the rapid reduction in velocity has a short duration. Only a small number of stations on the observed changes in velocity, indicating that the Lushan earthquake focal zone medium change is not significant.