九江—瑞昌序列震源位置及震源区速度结构的联合反演  

Simultaneous Inversion for Hypocentral Location and Velocity Structure of Jiujiang-Ruichang Sequence

作　　者：曾庆平 汤兰荣 李涛 

机构地区：[1]江西省地震局,江西南昌330039 [2]云南省红河州地震局,云南蒙自661100

出　　处：《华南地震》2009年第1期61-68,共8页South China Journal of Seismology

基　　金：中国地震局2008年度三结合课题"九江-瑞昌地震序列震源位置及震源区速度结构的研究";地震科学基金(A07124)

摘　　要：采用震源位置和速度结构的联合反演方法确定2005年九江—瑞昌5.7级地震序列的分布和震源区的速度结构。结果显示九江—瑞昌地震序列存在NW330°方向和NE55°方向的两组共轭分布,其中NW330°方向的优势分布更为明显;震源深度分布在3～18km的范围,地震主体破裂发生在上地壳—中地壳过渡层的P波速度低速区内,主震发生后余震向东南与西北方向两头扩展,其中往西北方向破裂时可能遇到了障碍体,积累的能量转向西南—北东方向继续破裂,引发了4.8级强余震。The hypocentral locations and velocity structure of the 2005 Jiujiang-Ruichang MsS.7 earthquake sequence have been identified using the simultaneous inversion method. The results show that this sequence displays two conjugated distributions at the directions of NW330° and NE55° respectively, but the former is more obvious. The focal depths vary from 3km to 18km and the main rupture occurred in the low P wave velocity zone of the upper-middle crust transition layer. Aftershocks developed along the southeast and northwest directions, but the latter probably encountered an asperity, and continued to rupture along the southeast-northeast direction and triggered the Ms4.8 strong aftershock.

关 键 词：地震定位 九江—瑞昌地震 联合反演 速度结构 

分 类 号：P315.61[天文地球—地震学]