关键词: 邢台, 束鹿断陷盆地, 新河断裂, 发震构造

Abstract: Based on the recent data from petroleum geological prospecting and the reexplana-tion of the relevant segment of deep seismic sounding profile from Yuanshi county, He-bei Province to Jinan, Shandong Province, the tectonic background and causative fault of Xingdai MS7.2 earthquake have been analysed in this paper. The results have shown that the epicentre of MS7.2 earthquake was located at the eastern margin of southern sub-depression within Shulu fault basin. The sub-depression developed in a fault block which was formed from the cover of platform cut and bound by four listric faults. There are two high angle faults beneath the fault block. By contrast with previous opinion, the authors propose that there is no simple corelation between seismicity, major fault and fault-controlled depression. The causative fault of MS7.2 earthquake was neither the gentle-dipping Xinghe listric fault, nor the high angle F3 fault, and the deep-seated eastern fault, but was the combination of the three faults. The high angle fault was the main part of the causative fault.

Key words: Xingdai, Shulu fault basin, Xinghe -fault, Causative fault of Xingdai Ms7.2 earthquake