2009年10月7日瓦努阿图地震破裂过程快速反演
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摘要
运用地震破裂过程快速反演方法,在2009年10月7日瓦努阿图地震发生后,采用全球地震台网(GSN)的宽频带地震资料,快速反演了这次地震的破裂过程,在震后3小时内得出了这次地震破裂过程的反演结果.结果表明,这次瓦努阿图地震的破裂过程具有如下基本特征:①矩震级约为MW7.8;②地震主要破裂持续时间约为80s;③滑动量在断层面上的分布比较简单,整个地震破裂只包含一个滑动量较大的区域;④这次地震的破裂模式接近圆盘破裂,其中心位于震源处.
The rupture process of 2009 October 7 Vanuatu earthquake was obtained by inverting the broadband seismic data of Global Seismographic Network (GSN) based on the fast inversion method of earthquake rupture process within 3 hours after the earthquake occurrence. It is found that the Vanuatu earthquake has several basic characteristics as follows: ① Moment magnitude is about MW7.8;② Rupture duration time is about 80 s;③ The static slip distribution is simple and the overall rupture process contains only one slip concentrated patch;④ The rupture plane of this earthquake appears to be a circular plane with the hypocenter locating at the center.
The rupture process of 2009 October 7 Vanuatu earthquake was obtained by inverting the broadband seismic data of Global Seismographic Network (GSN) based on the fast inversion method of earthquake rupture process within 3 hours after the earthquake occurrence. It is found that the Vanuatu earthquake has several basic characteristics as follows: ① Moment magnitude is about MW7.8;② Rupture duration time is about 80 s;③ The static slip distribution is simple and the overall rupture process contains only one slip concentrated patch;④ The rupture plane of this earthquake appears to be a circular plane with the hypocenter locating at the center.
引文
张勇.2008.震源破裂过程反演方法研究[D].北京:北京大学地球与空间科学学院:1-158.
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Chen Y T,Xu L S.2000.Ati me-domain inversion technique for the tempo-spatial distribution of slip on a finite faultplane with applications to recent large earthquakes in the Tibetan Plateau[J].Geophys J Int,143:407-416.
Kennett B L N.1983.Seismic Wave Propagation in Stratified Media[M].Cambridge:Cambridge University Press:1-339.
Kennett B L N,Engdahl E R.1991.Travel ti mes for global earthquake location and phase identification[J].Geophys JInt,105:429-465.
Xu L S,Chen Y T,Teng T L,Patau G.2002.Temporal and spatial rupture process of the1999Chi-Chi earthquake fromIRIS and GEOSCOPElong period waveformdata using aftershocks as empirical Greens functions[J].Bull SeismSocAmer,92:3210-3228.
张勇,冯万鹏,许力生,周成虎,陈运泰.2008.2008年汶川大地震的时空破裂过程[J].中国科学:D辑,38(10):1186-1194.
Chen Y T,Xu L S.2000.Ati me-domain inversion technique for the tempo-spatial distribution of slip on a finite faultplane with applications to recent large earthquakes in the Tibetan Plateau[J].Geophys J Int,143:407-416.
Kennett B L N.1983.Seismic Wave Propagation in Stratified Media[M].Cambridge:Cambridge University Press:1-339.
Kennett B L N,Engdahl E R.1991.Travel ti mes for global earthquake location and phase identification[J].Geophys JInt,105:429-465.
Xu L S,Chen Y T,Teng T L,Patau G.2002.Temporal and spatial rupture process of the1999Chi-Chi earthquake fromIRIS and GEOSCOPElong period waveformdata using aftershocks as empirical Greens functions[J].Bull SeismSocAmer,92:3210-3228.
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