利用数字化地震资料研究1995年永登5．8级地震的震源过程  

A STUDY OF HYPOCENTRAL PROCESS OF THE YONGDENG M S 5.8 EARTHQUAKE ON 22 JULY, 1995 USING NUMERICAL SEISMIC DATA OF THE AFTERSHOCKS

作　　者：闵祥仪[1] 王庭选[1] 刘凤祥[1] 杜承焕 

机构地区：[1]国家地震局兰州地震研究所

出　　处：《西北地震学报》1996年第3期25-29,共5页Northwestern Seismological Journal

摘　　要：利用兰州遥测地震台网数字化记录资料对１９９５年７月２２日永登ＭＳ５．８地震的１０次较强余震进行了精确定位，并由余震震源的空间分布图象讨论了该次地震的震源过程。余震震源明显分布在深度不同的呈立体交叉的两个断层面上，而且发震的时间段也具有明显的分组特征。主震震中位于断层立交部位。提出了在北东方向的区域应力场作用下，上地壳内不同层位的介质中可能有相互立体交叉的断层发育。Using the Lanzhou telemetered seismic net digital data, studies the geometric parameters of the sources of Yongdeng aftershocks in Gansu Province and discusses the source mechanism and the 3 D distribution pattern of aftershocks sources. The aftershocks of the Yongdeng earthquake are distributed on two crossed fault surfaces and their origin time has obvious group characters. The epicenter of main shock is just at the point where the two faults cross. The depths of two faults are also different. It is convinced that the source process of the Yongdeng M S 5.8 earthquake belongs to the interlayer gliding type.

关 键 词：甘肃 数字地震图 震源过程 层间滑动 地震数据 

分 类 号：P315.63[天文地球—地震学]