摘要
基于河北数字地震台网和流动台站的观测数据,利用HYPODD方法对2013年5月20日河北赞皇小震群进行重新定位,定位结果显示,地震呈NE向展布,震群震源深度集中在4—8 km,采用模拟退火算法和高斯—牛顿算法相结合的有效算法进行断层参数反演计算,计算结果与震源机制解断层面结果一致性较好,均为右旋走滑类型。
Based on the data from Hebei Digital Seismic Network stations and mobile stations, we relocated the earthquakes of Zanhuang small earthquake swarm which occurred on May 20 th, 2013 through HYPODD methods. The results show that the distribution of those earthquakes is along NE and the source depths are mainly between 4 km to 8 km. The result from the method combined simulated annealing algorithm and Gauss- Newton algorithm shows that the focal tomography is strike 41°, dip 77°, rake-156°. The focal mechanism for eight earthquakes with magnitude higher than M_L 2.0 in this earthquake swarm through inversion all show strike NE and NW tendency nodal plane which are consistent with the focal plane with dextral strike-slip fault type.
出处
《地震地磁观测与研究》
2015年第6期19-25,共7页
Seismological and Geomagnetic Observation and Research
基金
2014年测震台网青年骨干项目(20140302)
河北省重点地区壳幔结构及地震监测预报关键技术研究(132754071)联合资助
关键词
赞皇震群
重新定位
震源机制
断层面解
Zanhuang earthquake swarm
HYPODD relocation
focal mechanism
fault plane solution
