| 汶川大震前扰动异常的震源区定位探索 |
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| 引用本文： | 张希,李瑞莎,贾鹏,王庆良.汶川大震前扰动异常的震源区定位探索[J].武汉大学学报(信息科学版),2012,37(3):310-313. |
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| 作者姓名： | 张希 李瑞莎 贾鹏 王庆良 |
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| 作者单位： | 中国地震局第二监测中心,西安市西影路316号,710054 |
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| 基金项目： | 中国地震局地震行业科研专项资助项目 |
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| 摘 要： | 利用2008年5月12日汶川8.0级地震发生前,震区及周围数百km范围内青海、四川地区定点前兆观测获得的、类似前驱波特征的扰动异常,根据其异常分量、幅度、出现时间、空间位置与所处构造断裂展布等信息,构建＂源兆信号＂传播函数,借助拟牛顿最小二乘法反演可能的＂未来震源区＂。所得模拟震源位于龙门山断裂北段,距实际震中约134km,传播起始时间为震前近13h。
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| 关 键 词： | 汶川地震 前驱波 震源区 |
Epicentre-Source Area from Disturbance Abnormity Before Wenchuan Earthquake |
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| ZHANG Xi,LI Ruisha,JIA Peng,WANG Qingliang.Epicentre-Source Area from Disturbance Abnormity Before Wenchuan Earthquake[J].Geomatics and Information Science of Wuhan University,2012,37(3):310-313. |
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| Authors: | ZHANG Xi LI Ruisha JIA Peng WANG Qingliang |
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| Institution: | 1(1 The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi’an 710054,China) |
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| Abstract: | We use disturbance abnormity with features of precursor wave from pointing-precursor observation of epicenter area and nearby within hundreds kilometers in Qinghai-Sichuan area before the Wenchuan Ms 8.0 earthquake on May 12,2008 to search possible epicenter-source area.According to its abnormity vector,extent,time,space-location and the distribution characteristics of tectonic fracture,aided by construction of source-spreading function and inversion of quasi-Newton least square method.Computed epicenter-source is located on the northern segment of Longmenshan fracture,about 134 km away from real epicenter,occurred nearly 13 hours before this earthquake. |
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| Keywords: | Wenchuan Earthquake precursor wave epicenter-source area |
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