摘要
本文介绍了2019年4月7日北京海淀M2.9及4月14日北京怀柔M3.0地震的基本参数速报情况,并利用区域台网波形数据,采用全波形反演方法 ISOLA获得了这两次地震的最佳双力偶解。反演结果显示:M2.9地震的节面Ⅰ走向29°,倾角70°,滑动角-149°,节面Ⅱ走向288°,倾角61°,滑动角-22°;矩心深度14 km,矩震级MW=3.4。M3.0地震的节面Ⅰ走向93°,倾角84°,滑动角-30°,节面Ⅱ走向186°,倾角60°,滑动角173°;矩心深度16 km,矩震级MW=3.4。震源机制反演结果表明,两次地震均为走滑型为主的地震,其与震源区域附近历史地震震源机制解具有相同性质。
The parameters of the April 7,2019 Haidian M2.9 and the April 14,2019 Huairou M3.0 earthquakes in Beijing are rapidly determined by the CENC. The best double-couple solutions of the two earthquakes in Beijing are studied by the ISOLA full-waveform method using the observed waveform data from the regional seismic networks. The result of this study shows:for the M2.9 earthquake:strike=29°,dip=70° and rake=-149° for nodal plane I,and strike=288°,dip=61° and rake=-22° for nodal plane II.The centroid depth is about 14 km and the moment magnitude(MW) is 3.4;And for the M3.0 earthquake:strike=93°,dip=84° and rake=-30° for nodal plane I,and strike=186°,dip=60° and rake=173° for nodal plane II;the centroid depth is about 16 km and the moment magnitude(MW) is 3.4.The focal mechanism inversion shows that these 2 earthquakes are both strike-slip events,which are of the same type as the historical quakes in the adjacent area.
作者
刘敬光
黄志斌
梁姗姗
Liu Jingguang;Huang Zhibin;Liang Shanshan(Institute of Disaster Prevention,Hebei Yanjiao 065201,China;China Earthquake Networks Center,Beijing 100045,China)
出处
《国际地震动态》
2019年第9期2-6,共5页
Recent Developments in World Seismology
基金
中央高校基本科研业务费（ZY20190302）资助
关键词
地震参数
全波形反演
震源机制解
earthquake parameter
full-waveform inversion
focal mechanism solution
