【摘要】 以浅层地震勘探结果为主 ,研究了上海地区的断裂活动性。结果表明 ,上海地区NW向断裂的活动性要较其它方向强 ,最新活动时间一般为中更新世 ,有的可延续至晚更新世 ,但整体仍属弱活动性断裂。上海地区的地震活动性与所揭示的断裂活动性也相吻合。通过分析现有资料 ,认为上海地区不具备发生≥ 6级地震的构造条件 ,但有发生 5级左右地震的构造环境。更多还原

【Abstract】 The Quaternary activity of faults in the Shanghai region has been studied by means of shallow seismic prospecting. It shows that the NW-trending faults more active relatively than the other strikes in the Shanghai region. The latest activity of the NW-trending faults occurred generally in middle Pleistocene, but in some segments it might continue to late Pleistocene. But it still belong in weak activity as a whole. The seismicity agrees with faults activity revealed. According to historical earthquakes, the current activity of small earthquakes and Quaternary fault activity in this area, it is suggested that there’s no condition for the occurrence of M S≥6.0 earthquakes within this area, but it would not be surprising if an M S≈5.0 earthquake should occur in the future.更多还原