Study of Slow-moving Landslide Characteristics Based on the SBAS-InSAR in the Xianshuihe Fault Zone

Abstract

Abstract:

Xianshuihe Fault is one of the most important boundary fault on the eastern Tibetan Plateau of Sichuan-Yunnan block, and it is strongly active since the Holocene. The rock-mass and soil-body structures are porous along the Xianshuihe Fault zone. Under the action of earthquake caused by the active fault and its slowly moving and heavy rainfalls, landslides and debris flows occur frequently and have caused serious harm in this area. On the basis of the previous studies, SBAS-InSAR (small baseline subset interferometric synthetic aperture radar) method is employed to analyze and calculate the activity rate of Daofu to Luhuo section in Xianshuihe Fault zone combined with fifteen PALSAR scene data acquired by ALOS-1 during 2007-2011. And the deformation characteristics of time series are also acquired about the creeping landslide occurring along Xianshuihe Fault in these five years. The results show that in recent years the creeping in Daofu to Luhuo section is the mainly active type for the fault, and the creeping rate is about (9.4±0.78) mm/a, and the creeping effect of the fault has an important influence on the occurrence of landslides in this area. While the distance from Xianshuihe Fault is closer, the coherence among images is stronger, and coherent points are more stable and the interference effect is better, thus the cumulative displacement of landslides is greater. Ninety-eight creeping landslides along Daofu to Luhuo section of Xianshuihe Fault are identified, linearly distributing along both sides of the fault; the surface deformation characteristics of the typical creep landslide is also analyzed. Based on SBAS-InSAR Radar Data Processing method, we can effectively analyze the slow deformation of the surface, and the changing and developing laws of these regional creeping landslides. This study plays a certain guiding role on the prevention and mitigation of geohazards along Xianshuihe Fault and in the other similar areas.

Key words: small baseline subsets, Xianshuihe Fault, creeping, landslide

CLC Number:

P642.2
P627

LIU Xiaoyi, YANG Zhihua, GUO Changbao, SHEN Wei, SU Fangrui. Study of Slow-moving Landslide Characteristics Based on the SBAS-InSAR in the Xianshuihe Fault Zone[J]. Geoscience, 2017, 31(05): 965-977.

Figures/Tables 15

References 51

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影像获取时间	轨道号	幅号	极化方式	入射角 /(°)	图幅中心 (E/N)
20070126	480	610	FBS	34.3	100.814/31.202
20070613	480	610	FBD	34.3	100.832/31.165
20070729	480	610	FBD	34.3	100.833/31.203
20071214	480	610	FBS	34.3	100.843/31.195
20080129	480	610	FBS	34.3	100.846/31.191
20080315	480	610	FBS	34.3	100.847/31.202
20080430	480	610	FBD	34.3	100.855/31.201
20081216	480	610	FBS	34.3	100.812/31.179
20090131	480	610	FBS	34.3	100.814/31.196
20090618	480	610	FBD	34.3	100.821/31.199
20091219	480	610	FBS	34.3	100.830/31.200
20100203	480	610	FBS	34.3	100.841/31.171
20100621	480	610	FBD	34.3	100.842/31.184
20100921	480	610	FBD	34.3	100.843/31.2
20110206	480	610	FBS	34.3	100.853/31.199

影像获取时间	轨道号	幅号	极化方式	入射角 /(°)	图幅中心 (E/N)
20070126	480	610	FBS	34.3	100.814/31.202
20070613	480	610	FBD	34.3	100.832/31.165
20070729	480	610	FBD	34.3	100.833/31.203
20071214	480	610	FBS	34.3	100.843/31.195
20080129	480	610	FBS	34.3	100.846/31.191
20080315	480	610	FBS	34.3	100.847/31.202
20080430	480	610	FBD	34.3	100.855/31.201
20081216	480	610	FBS	34.3	100.812/31.179
20090131	480	610	FBS	34.3	100.814/31.196
20090618	480	610	FBD	34.3	100.821/31.199
20091219	480	610	FBS	34.3	100.830/31.200
20100203	480	610	FBS	34.3	100.841/31.171
20100621	480	610	FBD	34.3	100.842/31.184
20100921	480	610	FBD	34.3	100.843/31.2
20110206	480	610	FBS	34.3	100.853/31.199

剖面线	速率均值	北东盘速率	南西盘速率	断层两盘相对运动
A	-5.21±0.19	-1.32±0.25	-10.46±0.42	9.14±0.67
B	-4.36±0.37	-2.12±0.39	-12.73±0.43	10.61±0.82
C	-5.55±0.37	-4.68±0.25	-13.33±0.45	8.65±0.67
D	-4.18±0.48	-1.76±0.46	-11.23±0.61	9.47±1.07
E	-4.91±0.30	-3.43±0.28	-12.56±0.60	9.13±0.88
F	-3.65±0.18	-1.24±0.17	-10.64±0.40	9.40±0.57
平均值	-4.635±0.42	-2.43±0.30	-11.83±0.48	9.40±0.78

剖面线	速率均值	北东盘速率	南西盘速率	断层两盘相对运动
A	-5.21±0.19	-1.32±0.25	-10.46±0.42	9.14±0.67
B	-4.36±0.37	-2.12±0.39	-12.73±0.43	10.61±0.82
C	-5.55±0.37	-4.68±0.25	-13.33±0.45	8.65±0.67
D	-4.18±0.48	-1.76±0.46	-11.23±0.61	9.47±1.07
E	-4.91±0.30	-3.43±0.28	-12.56±0.60	9.13±0.88
F	-3.65±0.18	-1.24±0.17	-10.64±0.40	9.40±0.57
平均值	-4.635±0.42	-2.43±0.30	-11.83±0.48	9.40±0.78