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《Acta Geodaetica et Cartographica Sinica》 2014-09
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Post-earthquake Landslides Distribution along Longmenshan Major Fault during Rainy Season with Short-baseline InSAR

CHENG Haiqin;CHEN Qiang;LIU Guoxiang;YANG Yinghui;LIU Liyao;Department of Remote Sensing and Geoinformation Engineering,Southwest Jiaotong University;School of Civil Engineering and Architecture,East China Jiaotong University;  
In order to investigate the spatial pattern of landslides along the major fault in Longmenshan area,the PALSAR interferometric pair with short baseline is utilized in the study.The atmospheric phase correction model with three dimensional geo-spatial factors is proposed to eliminate the long wavelength components.The LOS deformation threshold is set to reduce the short wavelength phase error.The terrain slope factor is introduced to analyze the spatial pattern of post-earthquake landslides triggered by the rainstorm.The results show that the active landslides presented clearly a linearly distribution along both sides of Yingxiu-Beichuan fault.Most of the landslides are about 3~15km away from the major fault.The statistical data suggested that almost 90%of the post-earthquake landslides locate in the elevation range of 1000~3000mand the terrain slope factor of 15°~35°.The spatial distribution characteristics with 70%landslides on the hanging wall indicated that the after effect of hanging wall upthrusting motion dominated the pattern of post-earthquake landslides.
【Fund】: 国家自然科学基金(41472255;41072220);; 四川省应急测绘与防灾减灾工程技术研究中心开放基金(K2014B006);; 中央高校基本科研业务费专项资金(2682014BR014)
【CateGory Index】: P225.1;P237;P642.22
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