2010年4月14日青海玉树地震破裂过程快速反演  

Fast inversion of rupture process for 14 April 2010 Yushu,Qinghai,earthquake

作　　者：张勇[1] 许力生[1] 陈运泰[1,2] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]北京大学地球与空间科学学院,中国北京100871

出　　处：《地震学报》2010年第3期361-365,共5页Acta Seismologica Sinica

基　　金：中国博士后科学基金项目(20080440435);中国地震局地震行业科研专项(200808068;200708031)共同资助

摘　　要：基于远震资料的破裂过程反演方法,通过反演2010年4月14日玉树地震的全球宽频带地震垂直向P波波形记录,先后4次反演得到了玉树地震的破裂过程,并比较和讨论了这4次结果.结果表明,玉树地震的破裂过程具有如下基本特征:①地震主要由两次子事件组成,分别对应于震中附近以及震中东南方向上的两块滑动量集中的破裂区域,其中与第2次子事件对应的震中东南方向上滑动集中的区域破裂贯穿至地表;②最大滑动量和最大滑动速率分别为2.1m和1.1m/s,断层滑动速率较大;③玉树地震总体上是一次单侧破裂事件,破裂从初始破裂点(即仪器测定的震源位置)开始,主要向震中东南方向扩展,由"地震多普勒效应"导致在震中东南方向上产生强烈能量聚焦,是玉树城区遭受严重破坏在震源方面的主要原因.Four inversion results of the rupture process of 14 April 2010 Yushu,Qinghai,earthquake,obtained by inverting the broadband seismic data of Global Seismographic Network （GSN） based on the inversion method of earthquake rupture process,was compared and discussed. It is found that the Yushu earthquake has several basic characteristics as follows： ① There exist two principal sub-events which correspond to two slip-concentrated patches locating near the hypocenter and to the southeast of the epicenter. The rupture of the slip-concentrated patch to the southeast of the epicenter broken though the ground surface; ② The peak slip and peak slip-rate are about 2.1 m and 1.1 m/s,respectively,indicating that the Yushu earthquake is an event with large slip-rate on the fault plane; ③ Overall the Yushu earthquake is a unilateral rupture event with the rupture mainly propagating southeastward. The strong focusing of the seismic energy in the southeast of the epicenter due to the ＂seismic Doppler effect＂ reasonably accounts for the tremendous damage of Yushu city.

关 键 词：地震破裂过程 快速反演 青海玉树地震 地震应急响应 

分 类 号：P315.3[天文地球—地震学]