ELEVATION AND SUBSIDENCE OF COASTAL ZONE OF SOUTHERN PUTIAN, FUJIAN 3600 YEARS BP

This paper describes the elevation and subsidence of coastal zone of southern Putian 3600 years BP, having basic characteristics of large magnitude, high frequency and fast rate. Among five times of elevation and subsidence ascertained so far, the largest magnitude of the subsidence is 12.5m, the largest magnitude of the elevation is 35.5 m, the difference of the magnitude of the elevation of beach rocks formed at the same time is 23.5 m, the average rate of the elevation and subsidence is from 5cm to 8 cm per year. The coastal elevation and subsidence over the last scores of years are of the faulted uplift zone in the south, of the faulted depression zone in the north, the average rates of the elevation and subsidence are respectively 6 cm per year and 8cm per year. In addition, it is found that the strong subsidences occurring in the past often have something to do with the big earthquakes.     

福建莆田南部海岸带三千多年以来的升降运动

本研究区海洋带位于福建省莆田县南部兴化湾以西、湄州湾以东的半岛和岛屿地带,属于山地丘陵海岸,面积约700多平方公里。作者通过野外调查和14C同位素年代测定等研究认为,就我国目前已有关于各地海岸带升降问题的研究报道来看,本研究区海岸带三千多年以来断块差异升降运动强烈,其升降幅度、变化频率和速率是罕见的。通过对海岸带沉降的研究发现,本研究区的强烈沉降往往与地震的发生有一定的对应关系。另外还发现,本研究区从海域的岛屿到大陆的半岛为两条北东向断隆带-断陷带所组成的现代差异升降带,并超越本区向北东延伸。