Analysis and Study on Prediction of Medium-strong Earthquake in the Yanshan-Bohai Fault Zone

The characteristic of history and modern earthquake activities in the Yanshan-Bohai fault zone is studied.We also discuss the temporal and dimensional characteristic of the earthquakes.The result shows that the possibility of earthquake with over M7 is not large,but the possibility of earthquakes with over M6 occurring in the future should not be eliminated.The location in which a medium-strong earthquake may occur will still be in the east of the western and middle parts of the fault zone.The possibility that the next earthquake migrates to the east of the middle part is much.