远场GPS同震位移的变形特征分析——以2011年日本东北大地震为例  

Research on the Far-Field GPS Co-Seismic Displacement Deformation:The 2011 Tohoku-Oki Earthquake (Mw 9.0)

作　　者：杨君妍 易爽 孙文科 YANG Junyan YI Shuang SUN Wenke(University of Chinese Academy of Sciences, A19 Yuquan Road, Beijing 100049, China Key Laboratory of Computational Geodynamics, A19 Yuquan Road, Beijing 100049, China)

机构地区：[1]中国科学院大学,北京市玉泉路19号甲100049 [2]中国科学院地球动力学计算重点实验室,北京市玉泉路19号甲100049

出　　处：《大地测量与地球动力学》2017年第11期1112-1117,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41331066;41474059);中国科学院科学研究重点计划(QYZDY-SSW-SYS003);中国科学院/国家外国专家局创新团队国际合作伙伴计划(KZZD-EW-TZ-19)~~

摘　　要：利用2011日本东北大地震的亚洲东部GPS远场水平位移数据,通过计算及比较分析4个独立震源解和倾/滑角效应,研究了远场地震变形的空间分布特征和规律。结果表明,对于低角度逆冲型地震来说,水平位移格林函数在远场位移场中占主导作用。基于此确定了远场GPS水平位移场能在反演中有效利用的空间范围,为联合远场GPS数据和近场GPS数据反演断层滑动分布作理论准备,并为远场数据反演位错Love数(h、l)提供理论依据。After the 2011 Tohoku-Oki earthquake（Mw9.0）,near-field GPS data and Ocean GPS data were separately derived for the fault slip model or joint inversion.However,up to now,far-field GPS data are rarely used for inverting the slip pattern.By calculating and comparing the dip and rake angle of four independent source solutions,the paper studies spatial distribution characteristics and rules of the far field earthquake horizontal deformation using GPS data from eastern Asia.Results show that for subduction earthquakes with low dip angles,the horizontal tensile displacement Green Function is the main part of the far-field horizontal displacement.We can also determine the range of effective GPS horizontal displacement data in the inversion.It provides the theoretical basis for joining far-field and near-field GPS observations to invert the fault slip models of the 2011 Tohoku-Oki earthquake（Mw 9.0）and to invert the dislocation Love numbers hand l.

关 键 词：远场GPS同震位移 地震位错 2011日本东北大地震(MW9.0) 断层滑动反演 

分 类 号：P315[天文地球—地震学]