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Slope deformation prior to Zhouqu, China landslide from InSAR time series analysis

机译:InSAR时间序列分析的中国舟曲滑坡前的边坡变形

摘要

A major landslide in Zhouqu, China occurred on August 8, 2010 and caused widespread damage and over 1700 casualties. We study the deformation of the slopes over a time period of about three years prior to the landslide by an enhanced StaMPS-SB technique with 16 ascending ALOS/PALSAR images. In particular, the orbit error and stratified troposphere that were not well dealt with in the original StaMPS-SB method have been satisfactorily corrected by a novel phase ramp correction method. The deformation in four regions of the study area has been retrieved with a maximum of up to 70. mm/yr. In the Luojiayu-Sanyanyu valley, the slopes where the 2010 giant landslide occurred have been found to be quite unstable before the event. Deformation exceeding 30. mm/yr has been detected in the Suoertou slope, which is a well-known place for an ancient fault zone landslide. Fast movement larger than 40. mm/yr is observed in the Xieliupo slope, which poses threats of landslide dam and dammed lake to the Pai-lung River together with another slope deformation detected in the opposite slope. In the Nanshanqiaotou slope, the detected ~. 30. mm/yr deformation can be viewed as the prelude of the large landslide occurred in October 2010. More important, it is found that the slope deformation time series has strong correlation with the precipitation in the area as well as with the devastating Wenchuan earthquake that occurred in May 2008 whose epicenter is about 300. km away from Zhouqu.
机译:2010年8月8日,中国舟曲发生了严重的山体滑坡,造成了广泛的破坏,造成了1700多人伤亡。我们通过使用增强的StaMPS-SB技术和16个上升的ALOS / PALSAR图像研究了滑坡发生之前大约三年的时间段内的斜坡变形。尤其是,原始的StaMPS-SB方法未能很好地处理的轨道误差和分层对流层已通过新型相位斜坡校正方法得到了令人满意的校正。研究区域的四个区域中的变形已被恢复,最大值不超过70. mm / yr。在罗家yu-三眼yu河谷,发现2010年巨灾之前发生的山坡非常不稳定。在Suoertou斜坡发现了超过30. mm / yr的变形,这是一个古老的断裂带滑坡的著名地方。谢里坡坡观测到的快速运动大于40. mm / yr,这对滑坡水坝和堰塞湖构成了威胁,对排龙河以及在相反坡面发现的另一坡度变形构成威胁。在南山桥头坡上,发现〜。 30. mm / yr变形可以看作是2010年10月发生大滑坡的序幕。更重要的是,发现斜坡变形时间序列与该地区的降水以及汶川地震具有强烈的相关性。发生在2008年5月,震中距舟曲约300公里。

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