基于SBAS-InSAR的鲜水河断裂带蠕滑型滑坡特征研究

发布时间：2018-04-30 02:05

本文选题：短基线集 + 鲜水河断裂　；参考：《现代地质》2017年05期

【摘要】：鲜水河断裂带是青藏高原东部川滇地块的一条重要边界断裂,全新世以来活动强烈,断裂带沿线岩土体结构破碎强烈,在断裂活动诱发地震、断裂蠕滑和强降雨等因素作用下,断裂带沿线滑坡、泥石流等地质灾害发育密度大,危害严重。在前人研究的基础上,采用短基线集(SBAS-InSAR)的方法,基于日本对地观测卫星(ALOS-1)所获得的2007—2011年期间15景PALSAR数据,对鲜水河断裂带道孚至炉霍段的活动速率进行分析计算,获取了该段断裂带内蠕滑型滑坡5年间的时间序列形变特征。研究结果表明:鲜水河断裂带道孚至炉霍段近年来以蠕滑滑动为主,蠕滑速率为(9.4±0.78)mm/a,断裂的蠕滑作用对区域构造应力场和断裂带内滑坡具有重要的控制作用,表现为距离鲜水河断裂带越近,影像间相干性越强,稳定的相干点越多,干涉效果越好,滑坡滑动累计位移越大。沿鲜水河断裂道孚至炉霍段,共识别出98个蠕滑型滑坡,沿鲜水河断裂带两侧呈线性展布,并分析了典型蠕滑型滑坡的地表形变特征。基于SBAS-InSAR的雷达数据处理方法,可以有效地分析地表的缓慢变形以及区域性蠕滑型滑坡的发育发展变化规律,研究结果对于鲜水河断裂带沿线防灾减灾及类似构造活动地区的地质灾害研究具有一定的指导作用。
[Abstract]:The Xianshuihe fault zone is an important boundary fault in the Sichuan-Yunnan block in the eastern part of the Qinghai-Xizang Plateau. It has been active since Holocene, and the structure of rock and soil along the fault zone has been broken up. Landslide, debris flow and other geological disasters along the fault zone have high density and serious harm. On the basis of previous studies, using the method of SBAS-InSAR), based on the 15 PALSAR data obtained from Japan Earth observation Satellite (ALOS-1) for the period 2007-2011, the activity rate from Daofu to Ruhuo in the Xianshuihe fault zone is analyzed and calculated. The time series deformation characteristics of creeping landslide in this fault zone are obtained. The results show that the creep slip is dominant in the Daofu to Luoho section of the Xianshuihe fault zone in recent years, and the creep slip rate is 9.4 卤0.78 mm / a. The creeping slip of the fault plays an important role in controlling the regional tectonic stress field and the landslide in the fault zone. The closer it is to the Xianshuihe fault zone, the stronger the coherence between the images is, the more stable coherent points are, the better the interference effect is, and the greater the cumulative displacement of landslide sliding is. A total of 98 creep-slip landslides were identified along the Xianshuihe fault from Daofu to Luohuo and distributed linearly along both sides of the Xianshuihe fault zone. The surface deformation characteristics of typical creep landslides were analyzed. The radar data processing method based on SBAS-InSAR can effectively analyze the slow deformation of the surface and the law of development and change of regional creeping landslide. The results are helpful to the study of geological hazards along the Xianshuihe fault zone and similar tectonic activities.
【作者单位】：中国地质科学院地质力学研究所;中国地质大学(北京)地球科学与资源学院;国土资源部新构造运动与地质灾害重点实验室;
【基金】：中国地质调查局项目(12120113038000) 国家自然科学基金项目(41402321) 中铁二院科研计划项目(二院科字201303)
【分类号】：P642.22

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