| 摘要: |
| 中更新世以来,南黄海西南部的活动断裂比较发育。活动断裂的 方向主要有NNW、NW向,次为NEE和EW向。活动断裂的特点为:①在平面上,主要分布于南黄海南部盆地的中南部。②活动性明显,它们控制了岸线和水下 深槽的方向,在浅层反射地震剖面上具有晚更新世的断层;地震频繁,1910年以来,平均每7.6年发生一次破坏性地震。③本区NNE向断裂不发育,尚未获 得NNE向断裂的活动证据,这一点与邻近陆地和东海不同。区内的NNW向沿岸大断裂十分重要,它是华东、华北一系列NNW向活动大断裂中的一个。 |
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| ACTIVE FAULTS IN THE SOUTHWEST OF SOUTHERN YELLOW SEA |
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| Abstract: |
| Magnetic, gravity and seismic survey shows the directions of tectonic move merit in the Southwest of Southern Yellow Sea are mainly NEE, WE and NW. The faults existed before early pleistocene and active or activated after middle pleistocene are called active faults. Through analysis of modern topography and shallow seismic data, especially the relationship between medium-strong earthquakes and tectonic structure, the run of active fault in the southwest of southern Yellow Sea is mainly NNW and NW, secondly NEE and WE. The features of the active faults are as follows. 1. High frequency of earthquake occurrence, average destructive earthquake occurring once every 7.6 years since 1910. 2. Active faults mainly in the middle south of the southern basin of Southern Yellow Sea. 3. Main NNW action direction of the faults according to the active zone of premonition phase, isoseismal lines and the distribution of post shock. The last feature is in accord with the fact that the tectonic line of NNW (especially NW) almost cuts and offsets all of the tectonic system in the maritime area. |
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