摘要
利用137个震源机制解的资料,反演了广东及邻区的应力场,获得了12个地区的构造应力张量数据.结果表明,福建西南部、江西南部、广东河源、珠江三角洲地区最大主应力σ1的方位大致为WNW;广东阳江地区最大主应力σ1的方位为NW,广西东部两区和北部湾地区最大主应力σ1的方位为近NNW.从东到西,最大主应力σ1方位大体上呈WNW--NW--NNW变化;最小主应力σ3的方位大体上呈NNE到ENE变化.中等主应力σ2相对大小R值在北部湾地区最小,福建龙岩地区最大.断层运动以走滑型为主.
We determine the stress field of Guangdong and its adjacent area by using focal mechanism solutions of 137 earthquakes and obtain tectonic stress tensors in 12 zones. The result shows that the azimuth of maximum principal stress σ1 is approximately WNW in southwestern Fujian, southern Jiangxi, Guangdong＇s Heyuan and the Pearl River Delta, NW in Guangdong＇s Yangjiang, and nearly NNW in the two zones of eastern Guangxi and Beibuwan Gulf （the Northern Gulf）, varying clockwise in WNW-NW-NNW from east to west. The azimuth of minimum principal stress σ3 varies from NNE to ENE. The relative magnitude of medium principal stress σ2 （R value）, is the smallest in Beibuwan and largest in Longyan of Fujian. Strike-slip faulting is dominated in the study area.
出处
《地震学报》
CSCD
北大核心
2008年第1期59-66,105,共8页
Acta Seismologica Sinica
基金
广东省科技计划重点项目(2005B32601003)
关键词
震源机制
应力张量
平均应力场
focal mechanism
stress tensor
mean stress field
