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科普:中巴科学家给莫克兰海沟做“CT扫描”

2018-01-27 16:41:17    新华网

莫克兰俯冲带也是地震频发地带。根据以往的研究,莫克兰俯冲带长约700多公里。但阿拉伯板块在向下俯冲的过程中,在什么部位被“卡住”?“卡住”的范围有多大、即地震带有多宽?目前,全球科学家都还不清楚,这也是中巴首次北印度洋联合考察的重要科学目标。

“我们给莫克兰海沟做‘CT扫描’,主要是研究阿拉伯板块和欧亚板块的物质成分。从而可以帮助理解,阿拉伯板块在向下俯冲过程中是在哪一段被‘卡住’?今后与陆地上的地震研究和大地测量相结合,就可以推算出地震带的具体分布。”杨宏峰说。

此外,因为莫克兰海沟是世界上最浅的海沟,有深厚的沉积物。而沉积物比较松软,即使发生比较小的地震,都有可能引起大面积的海底滑坡,引发比较大的海啸。1945年11月27日,莫克兰俯冲带的东部区域就曾经发生8.1级地震。除地震本身造成近300人死亡外,随后引发的海啸灾害更造成4000多人死亡。

杨宏峰说,中巴科学家联合研究莫克兰海沟的大尺度地质构造,可以为巴基斯坦海上安全与减灾提供科学依据,同时也为“一带一路”建设服务。

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