Abstract: The latest active tectonic zones,consisting of several NWW-trending uplifts and denressions. have been formed gradually in Fujian-Guangdong-Taiwan coastal area since Taiwan orogeny. These tectonic zones along with the known NE-NNE-trending uplift-depression zones have constituted a regional mosaic structure framework.In addition to plate collision and subduction,as well as the upwarping of upper mantle materials,the principal features of the region,such as the large amplitude of the fault throw or the upheaval of Moho surface,the great thickness of low velocity layer,crustal thinning,significant differential movement of the earth surface in the last 2000—3000 years and the NWW-trending tectonic activity in Taidong offshore,also provide important tectonic background for the occurrence of large earthquake.

Key words: The latest NWW-trending tectonic zone, Fujian-Guangdong-Taiwan coastal area, Coastal elevation and subsidence, High-level beach rock, tectonic indicators of large earthquake

摘要： 闽粤台沿海自台湾运动以来逐渐形成了多条北西西向隆起—拗陷的最新活动构造带,与已知的北东—北北东向隆起、拗陷带构成了区域性镶嵌构造格局。研究区内除板块相互碰撞、俯冲及上地幔物质上涌形成大震构造背景外,莫霍面隆起或隆起断距大、低速层厚、地壳变薄、近两、三千年地表抬升差异活动显著以及台东近海有北西西向构造活动等,也都是发生大震的重要构造背景。

关键词: 闽粤台沿海, 北西西向最新构造带, 海岸升降, 高位海滩岩, 大震的构造标志