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巴颜喀拉板块近年强震频发 汶川、九寨都处版块边缘

2017-08-10 09:15:26   中国青年网

8月8日21时19分,四川阿坝州九寨沟县发生里氏7.0级地震,突如其来的地震让川蜀大地又一次地动山摇。对此,多位地震专家在8月9日接受澎湃新闻采访时表示,本次九寨沟地震和2008年汶川地震都发生在巴颜喀拉板块的边缘地带,同属南北地震带上的板块内地震。

三轴压缩下岩石(锁固段)变形破坏过程示意图“巴颜喀拉板块以长条形从新疆帕米尔高原一直延伸到四川的龙门山断层,是近几十年来地震最为活跃的地区,汶川地震、芦山地震、玉树地震都与此相关。”中国地震局预报研究员陈会忠对澎湃新闻说。

而中国科学院地质与地球物理研究所研究员秦四清也对澎湃新闻表示,九寨沟地震与汶川地震为同一岩石破坏过程中的事件,“显然两次地震密切相关”。

此外,多位地震专家还表示,南北地震带南起云南和四川,向北从甘南延伸至陕西、宁夏、内蒙古西部、新疆东部最后到贝尔加尔湖,这一地震带上发生强烈地震的可能性仍很大。

“严格来说,南北地震带随时都有发生强烈地震的危险,实际上四川、云南都比较活跃,基本每年都有6级以上的地震,每隔5年到10年就有7级地震,说明南北地震带还是非常活跃的。”陈会忠说道。

近年来大地震多发生在巴颜喀拉板块边缘

针对公众关心的本次九寨沟地震是否与汶川地震有关的疑问,陈会忠表示,“如果两个地震的联系,我只能说汶川地震和九寨沟地震都是发生在巴颜喀拉板块的边缘地带。”

陈会忠解释称,除开印度洋板块、欧亚板块等全世界几大一级板块外,科学上还有二级板块的概念,中国内陆分为六大二级板块,其中巴颜喀拉板块是近十年来地震活动最为活跃的地区。

“比如说2008年和2014年的新疆于田地震,2001年的昆仑山口8.1级地震,都是在巴颜喀拉板块的北部边缘,然后汶川地震和芦山地震是在巴颜喀拉板块的东部边缘,和四川盆地相接的区域,还有就是青海玉树地震,是在巴颜喀拉板块的南部边缘,巴颜喀拉板块是一个长条形状从帕米尔高原一直延伸到四川的龙门山断层,这些都是巴颜喀拉板块边缘地带的地震。”陈会忠说道。

对此,中国灾害防御协会灾害史专业委员会主任、中国地震局地质研究所研究员高建国表示认同,“当然有两种说法,还有的说没有联系,我认为是有联系的,汶川地震不是点源地震而是线源地震,九寨沟也位于汶川地震的九度烈度主震区。”

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