摘要
在收集了沈阳及其附近地区 (12 1°30′～ 12 4°30′E ,4 1°～ 4 3°N)已有地震震源机制解成果的基础上 ,利用MAPSIS系统提供的P波初动求解方法 ,求解了 1974年 12月～ 2 0 0 1年 12月期间 ,该区域小震复合震源机制解 (平均解 )。结果表明 ,研究区主压应力轴P轴集中分布在NEE SWW方向 ,主张应力轴T轴集中分布在NNW SSE方向 ,这与本地区区域应力场的方向一致。
On the basis of that focal mechanism solutions in Shenyang region and its surrounding (longitude 121°30′to 124°30′,latitude 41° to 43°),using P wave first motion and MAPSIS system, the synthetic focal mechanism solutions of small earthquakes (average value) have been obtained in the region from December 1972 to December 2001.The result shows that the principal compression stress axes P are mostly in northeast-east and extensional axes T in the north-northwest direction.It is consistent with the stress field in this region.
出处
《地震地磁观测与研究》
2004年第5期35-39,共5页
Seismological and Geomagnetic Observation and Research
关键词
小震复合震源机制解
初动符号
沈阳地区
the synthetic focal mechanism solutions of small earthquakes,onset motion sign,Shenyang region
