摘要
通过对2008年5月28日汶川M8.0级地震后滑坡和堰塞湖的形成和分布特征,以及震后地下喷发物和灾害形成与分布特征的考察,结合龙门山地区侏罗纪前的海洋环境和现今龙门山前川西坳陷存在大量圈闭构造和地下3km的巨厚底层含大量异常高压天然气体这一结构特征分析,发现地下异常高压气体在地震时高速膨胀,在地下裂隙和断层等面状通道快速剪开底层涌出,造成岩体飞移、流动和扩散是产生灾害的重要因素。
The landslides and the barrier lakes distribution caused by the Wenchuan M8.0 earthquake happened on May 28th, 2008 are analyzed in this paper. Our results suggest that the following factors are possibly responsible for the large disaster. Before the Jurassic Period Longmenshan tectonic in zone west Sichuan depression were under marine environment, which could lead to the huge stocks of unusual high-pressure gas at about 3km underground. The underground unusual high-pressure gas rapid expand when Wenchuan earthquake occurred, the gas in deep pulled up the overlying strata, and made the overlay rock spout, flow, and spread out.
出处
《震灾防御技术》
2009年第4期406-416,共11页
Technology for Earthquake Disaster Prevention
基金
中国地震局地壳应力研究所基本科研业务专项(ZDJ2009-14)资助
关键词
地震灾害
喷出坑体
气囊
板块
Earthquake disaster
Hang out body
Airbag
Plate
