5.12汶川地震四川省平武县次生地质灾害遥感分析

Analysis on the Secondary Geological Disaster in Pingwu of 5.12 Wenchuan Earthquake,Sichuan Based on Remote Sensing Information

5.12汶川特大地震诱发了大量次生地质灾害,形成了堰塞湖等。以多类型、多时相的遥感图像为信息源,在地学知识的支撑下,采用人机交互的方式解析了5.12汶川地震形成的次生地质灾害及潜在地质灾害体。运用地理信息系统叠加技术,探讨了四川省平武县次生地质灾害发生、分布与基础地质背景条件的关系。结果表明:沿平通镇—南坝镇北东向断裂带(为区域上的龙门山中央断裂带北段)分布大量的滑坡体,水观乡—坝子乡—南坝镇一带震旦系地层区灾害点的数量、规模明显高于其他地层区,山河再造中导致了巨大的损失。其研究成果对灾害遥感机理研究具有科学意义,对灾后重建、地震多发地区的防灾具有借鉴作用。

The 5.12 Wenchuan Earthquake induced serious secondary geological disasters and formed many barrier lakes. China Geological Survey started a project of researching on the secondary geological disaster of 5.12 Wenchuan Earthquake by using the human-computer interaction technology based on multi-type and multi-temporal remote sensing images and the geosciences knowledge and analysed the secondary geological disasters and the potential geological disaster body. Also, they studied the basic geological background of the secondary geological disaster occurrence and distribution in Pingwu, Sichuan, using the overlay analysis technique of GIS. The results show that. there are many landslides along the fault zone of Pingtong town-Nanba town; the quantity and the scale of the disaster point in the Shuiguan town-Bazi town-Nanba town of the Sinian strata region is more than the other areas. They believe that these findings should be significant in the mechanism on disaster remote sensing research and can be good reference for the reconstruction in the area.