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这次地震到底咋回事?三问四川九寨沟7.0级地震

2017-08-09 15:37:21   新华网

原标题:这次地震到底咋回事?三问四川九寨沟7.0级地震

新华社北京8月9日电题:这次地震到底咋回事?四问四川九寨沟7.0级地震

新华社记者胡喆、林碧锋

8月8日21时19分,中国地震台网正式测定:四川阿坝藏族羌族自治州九寨沟县发生7.0级地震。“一方有难八方支援”,一时间关于九寨沟地震的消息牵动着亿万华夏儿女的神经……

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?新华社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。

此次四川九寨沟7.0级地震属于什么地震类型?

经初步了解,此次地震已造成100多人伤亡。九寨沟县通讯畅通,电力已恢复,漳扎镇部分房屋垮塌,局部道路受损。九寨沟干海子景区附近山体垮塌,交通不畅,救援人员正在疏通道路。

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。

怎么看此次地震后的次生灾害?

余震、堰塞湖、山体滑坡等地震次生灾害一直是震后各方关注的焦点,也是影响抗震救灾工作的重要方面。截至9日零时整,共记录到地震总数为108次,其中,3.0至3.9级地震3次。

四川省水利厅有关负责人介绍,盆景滩以上、火花海以下并未形成堰塞湖。经核查,受堵塞河道为火花海下游一条小河,垮塌体体积并不大。至9日凌晨,河道已经正常过流,河床水位抬高并不明显,“从上下游的流量看,过流没有受影响。”

学术界认定堰塞湖的标准为:堰塞体10米高以上;库容10万立方米以上。“显然,受堵塞河道达不到这个标准。”有关专家表示,根据观测,目前河道和水流平稳,附近群众不必惊慌。

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