2010年2月27日智利地震破裂过程快速反演

Fast inversion of the rupture process of 27 February 2010 Chile earthquake

运用地震破裂过程快速反演方法,在2010年2月27日智利地震发生后,采用全球地震台网(GSN)的宽频带地震资料,反演了这次地震的破裂过程,在震后约3.5小时得到了这次地震破裂过程的反演结果.结果表明,这次智利地震的破裂过程具有如下基本特征:①矩震级为MW8.6;②地震破裂持续时间约为150s;③包括4个滑动量集中分布区域,最大滑动量约为8m,最大滑动速率约为0.8m/s;④这次地震总体上是一次不对称的双侧破裂事件,破裂从破裂起始点(震源)开始,同时向南北两个方向扩展,但以向北扩展的破裂为主.

The rupture process of 27 February 2010 Chile earthquake was obtained by inverting the broadband seismic data of Global Seismographic Network（GSN） based on the fast inversion method of earthquake rupture process.It is found that the Chile earthquake has several basic characteristics as follows：① Moment magnitude is about MW8.6;② Rupture duration time is about 150 s;③ There are 4 slip patches and the peak slip and sliprate are about 8 m and 0.8 m/s,respectively;④ This earthquake is mainly a bilateral rupture event with the rupture propagating both southward and northward from the rupture initiation point（hypocenter）,and mainly propagating northward.