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| 2003年大姚6.2级、6.1级地震序列震源位置及震源区速度结构的联合反演 | |
| 引用本文： | 周龙泉,刘杰,马宏生,周俊杰.2003年大姚6.2级、6.1级地震序列震源位置及震源区速度结构的联合反演[J].地震,2009,29(2). |
| 作者姓名： | 周龙泉 刘杰 马宏生 周俊杰 |
| 作者单位： | 1. 中国地震台网中心,北京,100045 2. 中国地震局地震预测研究所,北京,100036 3. 河北工程大学资源学院,河北,邯郸,056038 |
| 摘 要： | 采用震源位置和速度结构的联合反演方法确定2003年大姚6.2级、6.1级地震序列的分布和震源区的速度结构.该方法首先确定研究区的速度结构,然后在该速度结构的基础上对地震重新定位.结果表明:① 大姚6.2级地震序列明显分为地震较密集的东南段和地震较稀疏的北西段,而且这两段存在一定的错动,速度结构也显示出高、低速交界带在错动处具有转折特点;② 大姚6.2级地震序列在深度上呈"V"字形分布,这与该地区呈倒三角形分布的低速体相对应,即余震主要分布在高、低速交界带附近;③ 大姚6.2级、6.1级地震的破裂区都位于倒三角形低速体的东南侧,6.2级地震沿高、低速交界带往下破裂,而6.1级地震沿高、低速交界带往上破裂;④ 6 km深度的速度分布显示震源区具有高、低速度体交替呈四象限分布特征,而且余震主要沿北西向的高低速交界带分布;⑤ 大姚6.2级主震的东南侧的高、低速交界带处的低速体速度值较北西侧低速值高,其对6.2级地震往东南方向破裂具有阻碍作用,即东南侧处于能量积累状态,有利于6.1级地震的发生. |
| 关 键 词： | 大姚地震 联合反演 地震定位 速度结构 |
Simultaneous Inversion for the 2003 Dayao M6.2 and M6.1 Earthquakes Sequence Locations and Velocity Structure in the Hypocentral Area |
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| ZHOU Long-quan,LIU Jie,MA Hong-sheng,ZHOU Jun-jie.Simultaneous Inversion for the 2003 Dayao M6.2 and M6.1 Earthquakes Sequence Locations and Velocity Structure in the Hypocentral Area[J].Earthquake,2009,29(2). | |
| Authors: | ZHOU Long-quan LIU Jie MA Hong-sheng ZHOU Jun-jie |
| Institution: | 1.China Earthquake Networks Center;Beijing 100045;China;2.Institute of Earthquake Science;CEA;Beijing 100036;3.College of Natural Resource;Hebei University of Engineering;Handan 056038;China |
| Abstract: | We determined the 2003 Dayao M6.2 and M6.1 earthquakes sequence location and velocity structure of the hypocentral area by a simultaneous inversion method.First the velocity structure is determined by the method,and then earthquake location is performed on the basis of velocity structure.The results show that the M6.2 earthquake sequence can divided into two segments,the relatively dense southeast segment and the relatively sparse northwest segment,and there is a dip offset between the two segments,characte... |
| Keywords: | Dayao earthquakes Simultaneous inversion Earthquake location Velocity structure |
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