长江口海域断裂第四纪活动性特征  

THE CHARACTERISTICS OF QUATERNARY ACTIVITY OF FAULTS IN THE SEA AREA NEAR THE YANGTZE RIVER MOUTH

作　　者：章振铨[1] 火恩杰[1] 刘昌森[1] 王锋[1] 

机构地区：[1]上海市地震局,中国上海200062

出　　处：《地震学报》2004年第4期426-431,共6页Acta Seismologica Sinica

基　　金：上海市科学技术委员会资助项目 (0 12 5 12 0 0 3)

摘　　要：通过浅层人工地震勘察获知 ,长江口海域断裂构造发育 ,以北东、北西向断裂为主 .断裂以上新世 -早更新世活动为主 ,最新活动可至中更新世 .断裂的最大断距一般为几十米 ,往上断距变小 ,中更新统底界的断距在 12～ 13m .断裂平均垂直位移速率为 10 - 3mm/a量级 .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 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.

关 键 词：断裂 活动性 长江口海域 

分 类 号：P546[天文地球—构造地质学]