【摘要】 主要讨论了南沙海槽断裂带的活动性和构造演化过程,并对海槽及附近海域的地质稳定性因素进行了分析。发现南沙海槽有活动断裂、火山岩侵入、海底滑塌和地震等不稳定因素。南沙海槽形成演化过程较为复杂,经历过多期逆冲推覆变形和褶皱隆升等构造活动,其中逆冲和隆升等活动现今可能仍在进行,属于次不稳定区域。另外,海槽西南端有滑塌现象和海底阶梯存在,工程地质条件较差。所以,海槽及邻近海区的工程建设需要特别注意这些不稳定因素,应尽量避开不稳定地区或采取工程加固措施等。更多还原

【Abstract】 According to the information of the seismic profiles,the paper analyses the basic characteristics and the activity of the Nansha Trough fault zone as well as the regional stability of the Nansha Trough and its adjacent area. At the same time,the hazard geological factors of the study area are discussed. There are many geological hazardous factors (landslip,active faults,et.) which endanger the marine development,oil and gas exploration and seabed pipe line directly and indirectly.更多还原