Analysis of Hebei Zhuolu M4.3 Earthquake on Sep.6, 2014

On September 6, 2014, a M4.3 earthquake occurred in Hebei Zhuolu. This earthquake break the M_L≥4.0 seismic quiescence in the Yanhuai basin and its surrounding area (39.8°～41.0°N,114.1°～116.1°E) since the Yuxian M3.4 earthquake occurred on Aug.31, 2005. The epicenter of earthquake is on the Yanfan fault zone in the Yanhuai basin. The earthquake is analyzed from the following aspects: geological background, earthquake sequence, focal mechanism and seismic activity. The result shows that, the main rupture surface of the earthquake is consistent with the Yanfan active fault and is mainly caused by striking fault. The earthquake sequence is belongs to main shock-aftershock type. According to previous earthquakes in this area, the earthquake may have significance for medium and strong earthquake forecasting in North China in the future.