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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。
On July 30, 2010, ML3.8 and 3.3 earthquakes occurred one after another in Yixian County, Hebei Province. The epicentral distance was only 7 km from Yixian Seismostation. The main deformation observation stations were located near the epicenter. Although the magnitude of the earthquake is relatively small, the 12 deformation measurements have different degrees of coseismic response, which is a prominent earthquake case in the coseismic response analysis of small and medium earthquakes. Based on the seismic waveform data of Hebei station network, the earthquake was repositioned. According to the earthquake epicenter and repositioning epicenter respectively, the focal mechanism of two earthquakes is calculated. The focal fault is initially determined as NEE fault, and the fault shows normal and dextral strike-slip.