河北易县M_L3.8、3.3地震同震形变响应及其震源机制

Co-seismic Deformation Response and Focal Mechanism Solution of Yixian M_L3.8 and M_L3.3 Eearthquakes in Hebei Province

摘要:

2010年7月30日河北省易县相继发生ML3.8、3.3地震,震中距离易县地震台仅7km,震中附近主要以形变观测台站为主。虽然地震震级相对较小,但是12个形变测项均有不同程度的同震响应,这在中小地震的同震响应分析中是较为突出的震例。根据河北台网的地震波形资料对地震进行了重新定位。根据速报震中和重新定位震中分别计算两次地震的震源机制,震源断层初步断定为NEE向断层,断层表现为正断兼右旋走滑。

Abstract:

On July 30,2010,ML3.8 and ML3.3 earthquakes occurred in Yixian,Hebei province.The epicenters were located about 7 kilometers from the Yixian seismic station.The stations around the epicentres mainly are deformation stations.Although magnitude of Yixian earthquakes are small,but there were co-seismic responses in 12 observation items,that is outstanding case for moderate-small earthquakes.The earthquakes are relocated according to seismic waveform data from seismic network of Hebei province.The focal mechanism solutions according to both the rapid report directory and the relocation result.The trends of focal fault of two earthquakes are NEE,and the nature of the fault are positive and right-lateral strike-slip.