【摘要】 <正>本文是笔者在珠江口至红海湾沿岸进行第四纪地质、地貌和新构造调查的基础上,对活动断裂所作的初步分析。 一、活动断裂的形成和演变 该区位于莲花山断褶带的西南段,南缘濒临南海(图版I),主要构造线为北东和北东东向,它们是本区的主要构造成分,控制着本区的地貌和地质构造的演化。在漫长更多还原

【Abstract】 The present study deals with the forming and evolution of the active fracture in the studied region, the macroscopic geological and geomorpholo-gical features of the fracture, the relationship of the active fracture with earthquakes, as well as the relationship of the active fracture with construction projects.The authors suggest that the Cathysian fracture (ENE-NE) formed in the Primary Group has largely indurated recently.The East Asia System fracture(NNE-NE)formed from the active margin in Mesozoic era was partly carrying on the movement recently and with obvious signs of geological and geomorphological activities and seismic records of historical periods. The South China Sea System (ENE-EW) caused by epicontinental spreading in Cenozoic era is a tension fracture system and is more active with strong seismic records in its history, constituting a main faulted-seismicity zone along the coast of South China.The authors consider that no over mid-strong active fractures pass through the Peninsulas of Pinghai, Dapeng,Jiulong and Shekou in the studied region.This is a weak seismic area with relatively calm seismic activities. Provided that sections with obvious ground surface activities in the mid-weak and weak active fracture zones can be avoided, there should be no serious damages to any large construction projects.更多还原