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四问九寨沟 7.0级地震

2017-08-10 07:33:49   中国青年网

此次四川九寨沟7.0级地震究竟属于什么地震类型?怎么看此次地震后的次生灾害?地震预警该如何发挥作用?记者于震后第一时间采访了中国地震台网中心地震预报部主任蒋海昆研究员及有关专家。

与5.12汶川地震没有直接关联,只是总体都属于巴颜喀拉块体周边的地震活动

存在6级左右余震风险

可能出现滑坡、堰塞湖等次生灾害

震中周边200公里内近5年发生3级以上地震142次

追问1 属于什么地震类型

蒋海昆表示,从断层活动类型来看,这次地震是水平推挤,即“走滑型地震”,这也是中国大陆最常见的地震类型。他告诉记者:“无论是逆冲型地震,还是走滑型地震,只要靠近断层的地方,都会有比较大的破坏。”

专家介绍,此次地震发生的地区是地震多发区域,地震震中位于岷江断裂、塔藏断裂和虎牙断裂附近,发震构造推测为塔藏断裂南侧分支和虎牙断裂北段。

蒋海昆表示,此次地震与“‘5·12’汶川地震”总体都属于巴颜喀拉块体周边的地震活动。巴颜喀拉块体为昆仑山东延部分,该块体地震较为活跃,巴颜喀拉块体正面推挤产生了“‘5·12’汶川地震”,这次地震与该块体南东向推挤有关系。

追问2 与新疆地震有无关联

据国家地震台网测定,北京时间2017年8月9日7时27分,在新疆博尔塔拉州精河县附近(北纬44.27度,东经82.89度)发生6.6级地震,震源深度约11公里。中国地震台网中心地震预报部主任蒋海昆在接受媒体采访时表示,从地质构造而言,四川、新疆地震没有直接关系。

地震发生后,中国地震台网中心和新疆地震局紧急召开联合视频会商,认为此次地震发生在天山地震带库松木契克山前断裂附近,震源机制为逆冲型。

追问3 与汶川地震有何联系

这次地震使很多人联想到2008年的汶川地震,两者有什么关系?蒋海昆解释,两次地震发生的力学状态有所不同,表现形式则均为破坏性。

他进一步介绍,这两次地震均发生在巴颜喀拉地块上,但发生的断层是两个。其中,汶川地震是龙门山断层,这次则为龙门山断层偏西,两者相距较近。龙门山是逆冲型的地震,也就是挤上去的。这次则为“走滑型地震”,断层基本上是直立的。总的来说,两次地震可以反映出巴颜喀拉地块持续向东南推移的过程。

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