摘要
运用新近发展的适用于求解小震震源机制的广义极性振幅技术(GPAT),求解2016年8月20日唐山震群ML2.0以上地震事件的震源机制,结果显示:①震群的震源机制以正断型为主,占总数的69.5%;②对于震群中小于ML3.5的地震,GPAT得到的矩震级MW大于台网观测报告常用的ML震级,事件震级越小,差距越明显,最大震级偏差为1.0;③GPAT计算深度能够反映震源的真实深度。总之,GPAT方法在唐山震群震源机制反演中效果良好。
Measuring the source parameters of small earthquakes is a basic work to study the source and regional tectonic stress states.This study uses the recently developed Generalized Polarity and Amplitude Technique(GPAT)for solving the focal mechanism of small earthquakes above ML2.0 of Tangshan earthquake swarm on August 20,2016.The results show that:①The focal mechanism of the earthquake swarm is dominated by normal-fault types,accounting for 74.6%of the total.②For earthquakes smaller than ML3.6 in the earthquake swarm,the moment magnitude MW obtained by GPAT is larger than the ML magnitude commonly used in the observation report of the network,the smaller the magnitude of the event,the more obvious the gap,the maximum magnitude deviation is 1.0.③The GPAT depth reflects the true depth of the source.In short,the GPAT method works well in the inversion of the focal mechanism of the Tangshan earthquake swarm.
作者
王宁
蔡璐
王莉婵
王亚玲
郭垚嘉
刘丽
WANG Ning;CAI Lu;WANG Lichan;WANG Yaling;GUO Yaojia;LIU Li(Hebei Earthquake Agency,Shijiazhuang 050021,China;Heze Earthquake Agency,Heze 274000,China)
出处
《华北地震科学》
2020年第3期49-55,共7页
North China Earthquake Sciences
基金
河北省地震局三结合课题(DZ20190422039)
河北省地震局星火项目(DZ20180319008)
星火计划面上项目(DZ20190422038)
中国地震局震情跟踪课题(2019010105)。
关键词
广义极性振幅技术
唐山震群
小震
震源机制反演
generalized polarity and amplitude technique(GPAT)
Tangshan earthquake swarm
small earthquakes
focal mechanism inversion
