| 短基线InSAR探测龙门山主断裂带两侧震后雨期的滑坡空间分布特征 |
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| 引用本文： | 程海琴,陈强,刘国祥,杨莹辉,刘丽瑶.短基线InSAR探测龙门山主断裂带两侧震后雨期的滑坡空间分布特征[J].测绘学报,2014,43(9):931-938. |
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| 作者姓名： | 程海琴 陈强 刘国祥 杨莹辉 刘丽瑶 |
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| 作者单位： | 1. 华东交通大学;
2. 西南交通大学 |
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| 基金项目： | 国家自然科学基金，四川省应急测绘与防灾减灾工程技术研究中心开放基金，中央高校基本科研业务费专项资金 |
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| 摘 要： | 为探测汶川震后龙门山主断裂带两侧滑坡灾害的空间分布特征，使用雨期前后的两幅超短基线PALSAR影像开展雷达干涉测量，提出三维空间因子SAR大气长波相位建模方法，利用雷达视线方向形变阈值扣除大气短波相位，联合地形坡度因子综合提取主断裂带两侧强降雨期的滑坡空间分布。计算结果表明，震后滑坡灾害基本沿映秀-北川主断裂带两侧呈条带状密集分布，其中90%滑坡分布于高程为（1000~3000）m区间，地形坡度因子则集中于(15~35)°范围，多数滑坡距离发震断层约为（3~15）km，70%滑坡分布于断层上盘区，上下盘滑坡数量和面积存在明显差异，表明震后滑坡受发震断层上盘逆冲运动特性的滞后效应较为显著。
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| 关 键 词： | 震后滑坡 主断裂带 短基线InSAR 空间特征 上盘逆冲效应 |
| 收稿时间： | 2013-12-09 |
| 修稿时间： | 2014-05-15 |
Post-earthquake Landslides Distribution along Longmenshan Major Fault during Rainy Season with Short-baseline InSAR |
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| CHENG Haiqin,CHEN Qiang,LIU Guoxiang,YANG Yinghui,LIU Liyao.Post-earthquake Landslides Distribution along Longmenshan Major Fault during Rainy Season with Short-baseline InSAR[J].Acta Geodaetica et Cartographica Sinica,2014,43(9):931-938. |
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| Authors: | CHENG Haiqin CHEN Qiang LIU Guoxiang YANG Yinghui LIU Liyao |
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| Institution: | 1. East China Jiaotong University;
2. Southwest Jiaotong University |
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| Abstract: | In order to investigate the spatial pattern of landslides along the major fault in Longmenshan area, the PALSAR interferometric pair with short baseline was utilized in the study. The atmospheric phase correction model with three dimensional geo-spatial factors was proposed to eliminate the long wavelength components. The LOS deformation threshold was set to reduce the short wavelength phase error. The terrain slope factor was 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. The majority of landslides were about (3~15) km away from the major fault. The statistics data suggested that almost 90 percent of the post-earthquake landslides located in the elevation range of (1000~3000) m and the terrain slope factor (15~35) degrees. The spatial distribution characteristics with 70% landslides scattered on the hanging wall indicated that the after effect of hanging wall upthrusting motion dominated the pattern of post-earthquake landslides. |
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| Keywords: | post-earthquake landslides major fault short baseline InSAR spatial pattern hanging wall thrusting effect |
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