岫岩-海城5.4级地震前小震震源机制解与记录特征分析  

An analysis on the focal mechanism solutions of small earthquakes and the record characteristics before the Xiuyan-Haicheng earthquake of 5.4

作　　者：张萍[1] 于龙伟[1] 李涯 迮安民[3] 刘天阁 吴野[1] 杨红艳[1] 

机构地区：[1]辽宁省地震局,中国沈阳110031 [2]大连地震遥测通讯站,中国辽宁116012 [3]丹东地震台,中国辽宁118000 [4]岫岩地震台,中国辽宁118400

出　　处：《地震地磁观测与研究》2003年第1期29-38,共10页Seismological and Geomagnetic Observation and Research

基　　金：国家科技部01-01-06基金资助

摘　　要：采用Pn、Pg初始波初动符号,利用乌尔夫网上半球投影,用作图方法求解了岫岩-海城震区(1999年1月～1999年11月29日)主震前辽宁数字地震台网记录(ML≥2.5)的41个小震的震源机制参数。结合前震记录的某些特征,对主震前应力方向的时空变化,震源错动性质进行分析和讨论。In this paper, the focal mechanism solutions of 41 small earthquakes ( ML ≥ 2.5 ) before the main shock ( from January 1999 to November 29 1999 ) in Xiuyan-Haicheng earthquake country are determined with a graphical interpretation of Wolff s net and the initial motion sign data of Pn and Pg phases. Combined with other features of the records before main shock, the temporal and spatial variation of stress direction before main shock and characteristics of earthquake dislocation are analyzed and discussed.

关 键 词：初动符号 震源机制 岫岩-海城地震 作图方法 应力 时空变化 

分 类 号：P315.3[天文地球—地震学]