The characteristics of Quaternary activity of faults in the sea area near the Yangtze River mouth

摘要

By shallow seismic prospecting, it is showed that the faults in the sea area near the Yangtze River mouth are mainly the NE and NW-trending faults. The main activity time of fault is Pliocene to Early Pleistocene, and the latest activity is up to Middle Pleistocene. The maximum of fault is generally several tens meters with the throw decreased upward. The dislocation near the bottom of Middle Pleistocene is 12～13 m. The average vertical displacement rate is on a level of 10-3 mm/a.