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九寨沟7.0级地震烈度图发布:大部分房屋经受住考验

2017-08-13 15:55:24   今日头条

六度区

涉及四川省阿坝藏族羌族自治州九寨沟县、若尔盖县、红原县、松潘县,绵阳市平武县;甘肃省陇南市文县,甘南藏族自治州舟曲县、迭部县,面积14006平方千米。

(详见文首烈度图)

震害基本特点

根据大量现场调查数据、仪器观测,以及对本地区历次地震震害相关研究的归纳,本次地震灾害具有如下

4大特点:

一是此次地震震级大,达到了7.0级;震源偏深,有20千米;地震影响范围除四川外,还包括甘肃部分地区。但重灾区除景区人口集中外,其他区域村寨稀疏,总体人口密度较低,加之当地防震减灾能力近年来不断提升,因而本次地震人员伤亡和建筑物损毁程度都远低于青海玉树7.1级、四川芦山7.0级、云南鲁甸6.5级地震。

二是九寨沟县及附近区域设防烈度为八度,震区房屋建筑抗震设防水平较高,抗震性能总体较好,特别是经过汶川地震恢复重建后的新建建筑达到了抗震设防要求,经受住了此次地震的考验。四川省地震、住建等有关部门近年来加强了农村民居抗震设防管理和指导,从建筑设计、工匠培训、宣传教育等方面做了大量扎实工作,在这次地震中充分显现了成效。景区及城镇建筑物多采用了框架结构,乡村传统民居多采用穿斗木结构,抗震性能较强,房屋倒塌和严重损毁的比例很低,有效减少了人员伤亡。

三是本次地震对九寨沟诺日朗瀑布、火花海等旅游景观和旅游基础设施造成较严重破坏,对当地自然景观和生态环境造成较大影响。当地政府正在科学审慎地制定自然遗产保护和恢复重建方案。

四是震区属于高山峡谷区,地震引发的次生地质灾害较为严重,导致人员伤亡和部分道路交通中断,增加了救援和人员转移安置难度。

答记者问

中国地震局地质研究所研究员李志强:

九寨沟绝大部分海子完好,火花海诺日朗瀑布受到影响

新闻发布会上,中国地震局地质研究所研究员李志强在回答记者提问时,介绍了此次地震对九寨沟景区破坏情况。

他表示,经过勘查,目前九寨沟景区受到的主要破坏是滑坡和公路和走步道破坏。就景点来看,景区内有两个比较重要的景点,一个是火花海,可以看到围堰破坏后,里面的水没有了;另一个是诺日朗瀑布,你如果过去没有见过它,可能觉得没啥,但是地震把瀑布的水帘洞形状破坏了,水帘洞景观没有了。但是九寨沟景区绝大部分的海子是基本完好的。

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