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Huo Enjie
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Huo Enjie Earthquake Administration of Shanghai Municipality, Shanghai 200062, China 
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基金项目:上海市科委资助项目(012512003)
Preliminary Study on Cenozoic Group and Fault Activity in the Sea Area Near the Yangtze River Mouth
Huo Enjie
Abstract:
By shallow seismic prospecting, the Cenozoic Group in the sea area near the Yangtze River Mouth can be divided into five seismic sequences. They correspond to the Quaternary, Pliocene, Upper Miocene, Lower Miocene and Eocene respectively. The Quaternary System covers all the detecting area. The Tertiary System overlaps and thins out from NE to SW. The sedimentary basement mainly consists of volcanic rock (J 3) and acidic rock (r 3 5). Paleogene or Late Cretaceous basins are not found there. The faults that have been detected are all normal faults. They can be divided into three groups (NE, NW, near EW) by their trend. The NE and NW trending faults are predominant, and agree with aeromagnetic anomaly. Their length and displacement are larger than that of the EW trending faults. The activity of the NE trending faults is different in different segments. The SW segment is a Quaternary fault, the middle segment is a Neogene fault, The NE is Paleogene. But the segment of the NW trending fault is not obvious. The average vertical displacement rate is about 0 015mm/a.
Key words:  Sea area near the Yangtze River mouth  Cenozoic layering  Fault structure