基于遥感调查的汶川地震极重灾区次生地质灾害分布特征

DISTRIBUTION CHARACTERISTICS OF SECONDARY GEOLOGICAL DISASTERS IN THE SEVERELY AFFLICTED AREA OF WENCHAN EARTHQUAKE BASED ON REMOTE SENSING SURVEY

汶川8.0级特大地震震区位于地质条件复杂、新构造运动活跃的四川省龙门山地区,此次地震是建国以来中国大陆发生的破坏性最严重的地震,造成了崩塌、滑坡、泥石流和堰塞湖等一系列次生地质灾害。分析和掌握次生地质灾害的分布与活动特征,可为灾区工程整治方案和防治措施提供科学的依据,为灾后重建选址提供参考,为其它地区灾害防治方案的制定提供借鉴。项目综合利用不同时相、不同传感器的光学影像和雷达影像以及其它地质地理资料,在相关遥感和地理信息软件的支持下,进行遥感图像专题信息解译和分析,获取了地震中四川省的10个极重灾县市的次生地质灾害解译数据,以此为基础探讨地震次生地质灾害的空间分布特征、发育特点与相关地质地理因素关系。结果表明,地震次生地质灾害与特定的地层岩性、构造破碎带、坡度等有着密切的联系。

The earthquake zone of Wenchuan Ms8.0 earthquake is located in Longmenshan areas in Sichuan Province.The areas have complex geological conditions,frequent neotectonic movements.This earthquake is the most serious destructive earthquake in China's Mainland since the P.R.China founded and it caused a series of secondary geological disasters such as the collapse,landslide,mud-rock flows.Analysing the disaster distribution and activity characteristic of secondary geology can provide a scientific basis for the dis...