海城-岫岩地区较大地震前震源机制的比较

详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文

英文篇名：THE COMPARISON OF FOCAL MECHANISM BEFORE LARGE EARTHQUAKES IN HAICHENG-XIUYAN AREA 中文刊名：防灾减灾学报 英文刊名：Journal of Disaster Prevention and Reduction 作者：邹向荣 ; 张萍 英文作者：ZOU Xiang-rong1 ; ZHANG Ping2(1.Seismic Station of Chaoyang City ; Liaoning Chaoyang 122000 ; China ; 2.Earthquake Administration of Liaoning Province ; Liaoning Shenyang 110034 ; China) 中文关键词：震群 ; 震源机制 ; 海城-岫岩地区 英文关键词：earthquake swarms ; local mechanism ; Haicheng-Xiuyan area 出版日期：2012-03-15 机构：朝阳地震台;辽宁省地震局; 年：2012 期：01 出版单位：防灾减灾学报

摘要

海城-岫岩地区是辽宁省小震、震群多发地区。本文选用1975年以来具有一定发震规模,且仪器记录相对较完整的3个显著震群(1975年海城7.3级,1999年岫岩5.4级和2008年海城ML4.8级地震),将其较大地震前ML≥4.0级地震震源机制结果进行比较,发现海城7.3级和岫岩5.4级地震前ML≥4.0级地震震源机制解与主震有较好的一致性,而2008年11月海城4.8级地震前ML≥4.0级地震震源机制一致性较差。我们对能否借鉴前震震源机制一致性的差异快速判断中强震发展的趋势,进行了探讨和研究。
Haicheng-Xiuyan area is an earthquake fluently-happened region in Liaoning Province.We selected 3 large scale earthquake swarms with complete instrumental records since 1975,which are Haicheng 7.3 magnitude earthquake in 1975,Xiuyan 5.4 magnitude earthquake in 1999 and Haicheng ML4.8 earthquake in 2008.We compared the focal mechanism of ML≥4.0 earthquakes before each main shock and found that the consistency between them is significant in Haicheng 7.3 magnitude earthquake and Xiuyan 5.4 magnitude earthquake but not in Haicheng ML4.8 earthquake.Then we researched the rapid determination of development of earthquakes by means of former earthquake focal mechanism consistency.

引文

[1]李宇彤,焦明若,李芳.岫岩MS5.4与海城MS7.3地震的共振和个性研究[J].地震研究,2005,28(3):231-235.
    [2]顾浩鼎,陈运泰,高祥林,等.1975年2月4日辽宁省海城地震的震源机制[J].地球物理学报,1976,19(4):271-285.
    [3]张萍,蒋秀琴.岫岩-海城Ms5.4地震序列的震源机制解及应力特征[J].地震地磁观测与研究,2001,22(2):76-82.