2013年12月1日新疆柯坪M_S5.3地震序列特征及震前异常分析

ANALYSIS ON CHARACTERISTICS OF KEPING M_S5.3 EARTHQUAKE SEQUENCE AND ANOMALY ON DECEMBER 1^(st),2013

介绍了2013年12月1日新疆柯坪MS5.3地震基本参数、震源机制解、地震序列特征,分析了震前、震中及相邻构造区地震活动特征以及200 km范围内定点前兆异常特征。研究结果表明:(1)本次地震发生在柯坪断裂,震源断错类型为兼左旋走滑分量的逆断类型;(2)该地震序列为主余型,余震衰减快且呈北东向展布;(3)震前地震活动性异常有2~4级地震嵌套平静、柯坪块体4级地震平静、3级地震条带、普昌断裂中等地震异常增强区和地震学参数;(4)定点前兆观测资料主要异常特征以突变为主。除哈拉峻钻孔倾斜外,其他定点前兆观测异常在空间分布上呈现出由近及远、向震中外围迁移的现象。

This paper introduced basic parameters, focal mechanism solutions, and earthquake se- quence characteristics of Keping MsS. 3 earthquake sequence and anomaly on December 1st,2013, and analyzed seismic activity before the earthquake, adjacent tectonic features and fixed precursory anomaly within 200 km range area. Research indicates ： （ 1 ） the earthquake occurred in keping frac- ture, focal faulted type was sinistral strike-slip component of reverse fault type ; （2） earthquake se- quence type was main aftershock, decaying quickly and NE trending; （3） abnormal seismic activity before the earthquake had Ms2 to Ms4 earthquake nested calm, Keping block Ms4.0 seismic quies- cence, Ms3 seismic belts, Pu Chang fault moderate earthquakes abnormal enhancement zone and seismology parameters ; （4） anomaly characteristics of precursory observation data was mainly muta- tion based. Except for borehole inclinometer in Halajun, other abnormal precursor observation on spatial distribution scale exhibited from near to far, showed phenomenon of migration to epicenter periphery.