芦山4.20地震破裂过程及其致灾特征初步分析
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摘要
采用全球地震台网的远震地震波数据快速反演了2013年4月20日雅安芦山地震(芦山4.20地震)的破裂过程,在震后3小时得到并发布了相关测定结果.结果显示这次地震的震级约MW6.8,包括两次破裂子事件,但都发生在断层面上震源(破裂起始点)附近,整个地震没有表现出明显的破裂方向性.雅安芦山地震的破裂没有大规模出露地表,主要地震灾害集中在断层上盘,位于芦山县和宝兴县一带.
Fast inversion for the rupturing process of the 20 April 2013 Lushan,Ya′an earthquake was conducted about 3 hours after the earthquake occurrence by using the GSN teleseismic waveform data.The obtained moment magnitude is MW6.8.It included two sub-events during the rupturing process,which occurred near the hypocenter or rupture initiation point and did not show significant rupture direction.The rupture of the earthquake did not break through the ground surface,and seismic disaster is concentrated on the hanging wall of the fault,around Lushan county and Baoxing county of Sichuan Province.
Fast inversion for the rupturing process of the 20 April 2013 Lushan,Ya′an earthquake was conducted about 3 hours after the earthquake occurrence by using the GSN teleseismic waveform data.The obtained moment magnitude is MW6.8.It included two sub-events during the rupturing process,which occurred near the hypocenter or rupture initiation point and did not show significant rupture direction.The rupture of the earthquake did not break through the ground surface,and seismic disaster is concentrated on the hanging wall of the fault,around Lushan county and Baoxing county of Sichuan Province.
引文
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[3]Zhang Y,Chen Y T,Xu L S.Fast and robust inversion ofearthquake source rupture process and its application toearthquake emergency response.Earthq.Sci.,2012,25(2):121-128.
[4]Chen Y T,Xu L S.A time-domain inversion technique forthe tempo-spatial distribution of slip on a finite fault planewith applications to recent large earthquakes in the TibetanPlateau.Geophys.J.Int.,2000,143:407-416.
[5]Xu L S,Chen Y T,Teng T L,Patau G.Temporal andspatial rupture process of the 1999Chi-Chi earthquake fromIRIS and GEOSCOPE long period waveform data usingaftershocks as empirical Green′s functions.Bull.Seism.Soc.Am.,2002,92:3210-3228.
[6]张勇,冯万鹏,许力生等.2008年汶川大地震的时空破裂过程.中国科学D辑:地球科学,2008,38(10):1186-1194Zhang Y,Feng W P,Xu L S,et al.Spatio-temporal ruptureprocess of the 2008great Wenchuan earthquake.Sci.ChinaSer.D.,2009,52(2):145-154.
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