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半月三次被地震"刷屏" 专家:今年地震不比往年频繁

2016-11-27 08:03:45   科技日报


新疆克孜勒苏柯尔克孜自治州阿克陶县,地震导致房屋坍塌。

11月25日22时24分,新疆阿克陶发生6.7级地震。截至26日11时30分,地震造成1人死亡,100间房屋倒塌。

11月13日新西兰8.0级、22日日本福岛近海7.2级地震,半个月内,我们三次被地震“刷屏”。不少“吃瓜群众”发问:“最近大地震为什么这么多?”“新疆的地震跟国外的地震有关系吗?”“下一步会不会地震频发?”带着这些问题,科技日报记者采访中国地震台网中心相关专家。

阿克陶区域历史上强震活跃

根据26日公布的资料,本次地震发震断层位于喀喇昆仑断裂与奥依塔克断裂附近。

中国地震台网中心专家在接受科技日报记者采访时说,这一区域历史上强震活跃,震中100千米范围内曾记录到17次6级以上地震,其中7级以上地震4次,距离此次震中最近的为1974年乌恰7.3级地震,约25千米;时间最近的地震为2016年6月26日吉尔吉斯斯坦6.7级地震,距这次地震区约58千米。

专家强调,此次地震位于高海拔地区,人烟稀少,而且当地近些年来实施了富民安居工程,民众居所总体抗震性能较好,预判不会导致大的人员伤亡。

今年地震活动较之往年并不突出

全球范围内接连发生大地震的情况并不是第一次。最让大家记忆犹新的是,今年4月全球发生了5次7级以上地震,包括4月10日阿富汗7.1级,4月13日缅甸7.2级,4月16日日本九州岛7.3级,4月17日厄瓜多尔7.5级和4月29日瓦努阿图群岛7.0级地震。

对此专家表示:时间分布不均匀是全球地震活动的特征,有的时段密集、有的时段稀疏,这是地震活动的一种正常状态。

尽管大家感觉今年的大震比较多,但专家们并不同意这一说法。根据中国地震台网中心的统计,今年截止到11月26日,全球共发生7级以上地震14次,其中8级地震1次。自1900年以来全球平均每年发生7级地震18次,因而对比来看,今年全球的7级地震活动并不显著。

“与去年对比,2015年全球发生7级以上地震20次,其中8级地震一次,可见今年的活动水平较之去年也不突出,”专家强调。

国外大震与国内小震关联度不明显

我国大陆位于欧亚地震带东端,大陆东侧及西南侧分别受太平洋板块和印度板块的推挤作用,地震活动及地震灾害始终十分强烈。进入新世纪以来,我国大陆呈现了地震活跃的特征,在南北地震带及新疆地区已经发生一系列强烈地震。

我国发生的这些地震与国外的大震是不是有关联?

专家表示,从地震研究的角度看,专业人员确实有时会把全球视为一个大的地震活动系统,来寻求时间上和空间上的相互影响关系。在某些时间段,我国的小震活跃与全球大震活跃呈现相关性,但某些时间段也没有,也即两者之间关联度不明显。

(原题为《今年全球地震活动不比往年频繁》)


责任编辑:李东舰 CN031
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