长江口海域的第四纪断层与新构造活动
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摘要
高分辨率多道地震调查表明,在长江口及其附近海域发现数条第四纪断层。他们有的切穿第四系底部,有的切入中更新统甚至晚更新统之中。结合对该区历史地震及近期地震资料的分析,这些第四纪断层可能与地震活动有着密切的联系,特别是其中切穿上更新统底部的F12(NE向)断层,与1996年11月9日的Ms6.1级地震震中及1505年10月19日Ms6 34级地震震中的距离都比较近。该断层与这两次地震的发生极有可能存在某种内在的联系。同时也说明该区域第四纪断层的出现不是一种孤立的现象,它是地壳新构造活动的反映。
Several Quaternary faults have been found in the Yangtze River estuary by high resolution multi-trace seismic surveying.These faults thrust into the bottom of the Quaternary period or the middle Pleistocene series,even reach the late Pleistocene series.These faults might have the close relationship with earthquake activity indicated by the study of the regional earthquake history and the latest earthquake record.Among the faults,fault F12thrusting into bottom of the late Pleistocene series is close to the earthquake epicenter of MS6.1 on November 9,1996 and MS63/4 on October 19,1505.The faults might have very close relationship with the two earthquakes.These cases show that the Quaternary faults are the result of Neotectonic movement.
Several Quaternary faults have been found in the Yangtze River estuary by high resolution multi-trace seismic surveying.These faults thrust into the bottom of the Quaternary period or the middle Pleistocene series,even reach the late Pleistocene series.These faults might have the close relationship with earthquake activity indicated by the study of the regional earthquake history and the latest earthquake record.Among the faults,fault F12thrusting into bottom of the late Pleistocene series is close to the earthquake epicenter of MS6.1 on November 9,1996 and MS63/4 on October 19,1505.The faults might have very close relationship with the two earthquakes.These cases show that the Quaternary faults are the result of Neotectonic movement.
引文
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