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地理科学  2010 

海南岛东寨港红树林区岩芯地球化学特征及其古地震指示

, PP. 777-782

Keywords: 历史地震,沉积突变,地震沉陷,红树林海岸,海南岛

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Abstract:

地震对海岸带地貌与沉积有明显影响,1605年海南岛琼山地震造成东寨港地区发生严重陷落事件。对采自东寨港红树林区258cm柱状岩芯YBL孔进行了粒度和元素地球化学分析,发现地球化学元素含量在125cm附近有明显突变,对应于沉积相从陆向海的转变,125cm以下岩芯沉积物为暗红棕色陆相沉积,125cm以上为灰色-橄榄灰色海相粉砂沉积。推测该沉积相突变是对海南岛东寨港地震陷落事件响应,结合采样点潮位高程推测1605年琼山地震导致东寨港区域沉陷幅度至少为1.6~1.8m。

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