Rapid estimation of fault rupture extent using envelopes of acceleration  

作　　者：Lan-Chi Kang Xing Jin Jun Li Yi Qiu Yong-Xiang Wei 

机构地区：[1]Seismological Bureau of Fujian Province

出　　处：《Earthquake Science》2013年第1期43-48,共6页地震学报（英文版）

基　　金：Spark program of earthquake sciences (XH13012, XH12026Y) ;National Key Technology R&D Program (2009BAK55B01)

摘　　要：We present a new strategy to estimate the geometry of a rupture on a finite fault for rapid reporting of seismic intensity. We use envelope attenuation relationships which were presented by Huo et al. （Acta Seismol Sin 16：519-525, 1994）. An important base of this work is the fault finiteness theory. We propose a new model to simulate high-frequency motions from earthquakes with large rupture dimension. The envelope of high-frequency ground motion from a large earthquake can be expressed as a rootmean-squared combination of envelope functions from smaller earthquakes. We use simulated envelopes of ground acceleration to estimate the direction and alongstrike length of a rupture. Using the Wenchuan and Jiji （Chi-Chi） earthquake dataset, we parameterize the fault geometry with an epicenter, a fault strike, and along-strike rupture lengths. So this methodology seems quite appropriate for the rapid reporting systems of seismic intensity.We present a new strategy to estimate the geometry of a rupture on a finite fault for rapid reporting of seismic intensity. We use envelope attenuation relationships which were presented by Huo et al. （Acta Seismol Sin 16：519-525, 1994）. An important base of this work is the fault finiteness theory. We propose a new model to simulate high-frequency motions from earthquakes with large rupture dimension. The envelope of high-frequency ground motion from a large earthquake can be expressed as a rootmean-squared combination of envelope functions from smaller earthquakes. We use simulated envelopes of ground acceleration to estimate the direction and alongstrike length of a rupture. Using the Wenchuan and Jiji （Chi-Chi） earthquake dataset, we parameterize the fault geometry with an epicenter, a fault strike, and along-strike rupture lengths. So this methodology seems quite appropriate for the rapid reporting systems of seismic intensity.

关 键 词：Rapid reporting of seismic intensityEnvelope Direction and along-strike length of arupture - Wenchuan and Jiji （Chi-Chi） earthquake 

分 类 号：P315.1[天文地球—地震学]