【摘要】 <正> 南海北部沿岸晚第三纪以来的构造迹象十分显著,历来引起人们的重视。但在七十年代以前,地质、地理学者对它的研究主要侧重于海岸升降方面,而对其他方面,诸如活动性断裂、褶皱、地震地质等,论述颇少。从七十年代开始,由于各省相继成立了地震大队,为了预测地震的发生和发展,对上述几个方面的研究才日益重视。更多还原

【Abstract】 This paper discusses some problems of recent crustal movements in this areawith various data of the geological, geomorpholofical, seismic and geodestic fields,and draws conclusions as follows: 1. There are three groups of main faults in this area--NE, NW, EW. Theyare still active faults and intersect each other, forming network fracture picture.The most of strong earthquake epicenters and hot springs occurred along the inter-section portion. 2. The broad area of peneplain occurred during the early tertiary. But it wasrejuvenated along the old fault zones in different directions in Neogene. The amplitude of the emergence and submergence was about 5km. Now it is still recurrentalong the old fault zones. 3. Recent volcanic activity in this area concentrats in the Northern Hainan island and Leichow peninsula. It is subdivided into 10 eruptive stages and 58 eruptivecycles.更多还原