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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (3) : 114-120     DOI: 10.6046/gtzyyg.2020.03.15
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Detecting tiny differential deformation of Tangshan urban active fault using multi-source SAR data
ZHANG Ling(), LIU Bin, GE Daqing, GUO Xiaofang
China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
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Abstract  

The active faults deformation, with distinct temporal and spatial variations, requires long-term and effective monitoring. InSAR (interferometry synthetic aperture Radar), with the advantages of high efficiency, wide coverage and low cost, is one of the main technical means for ground surface deformation survey in recent years. In this paper, the small differential deformation of the main active faults in Tangshan urban area was monitored by the interferometric point target analysis. Two kinds of radar data were used: the Wide strip mode of RADARSAT-2 C-band with 30m spatial resolution and the Strip mode of TerraSAR-X X-band with 3 m spatial resolution. The results show that the differential deformation of Tangshan-Guye active fault is obvious with the maximum differential velocity of 2 mm/a. In this case, the deformation results from RADARSAT-2 C-band medium resolution data can clearly show the tiny differential deformation between the two sides of the active faults. However, TerraSAR-X X-band data, with shorter wavelength, is more obviously affected by the change of surface cover. Compared with this deformation, the vertical differential deformation between the two sides of active faults is too small to be separated from the TerraSAR results.
Keywords InSAR      active fault      differential deformation      tiny surface deformation     
:  P237  
Issue Date: 09 October 2020
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Ling ZHANG
Bin LIU
Daqing GE
Xiaofang GUO
Cite this article:   
Ling ZHANG,Bin LIU,Daqing GE, et al. Detecting tiny differential deformation of Tangshan urban active fault using multi-source SAR data[J]. Remote Sensing for Land & Resources, 2020, 32(3): 114-120.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.03.15     OR     https://www.gtzyyg.com/EN/Y2020/V32/I3/114
测量值 精度(1σ)
平均形变速率(LOS)/(mm·a-1) 1
单次差分测量(LOS)/mm 5
东向/m 6
北向/m 3
高程/m 1.5
Tab.1  Typical values of precision
Fig.1  Data processing chart
编号 日期 编号 日期 编号 日期 编号 日期
1 2012/11/18 10 2013/11/13 19 2014/12/02 28 2016/03/26
2 2013/01/05 11 2013/12/07 20 2014/12/26 29 2016/04/19
3 2013/01/29 12 2014/02/17 21 2015/02/12 30 2016/05/13
4 2013/04/11 13 2014/04/06 22 2015/04/01 31 2016/06/06
5 2013/05/05 14 2014/04/30 23 2015/05/19 32 2016/06/30
6 2013/06/22 15 2014/08/04 24 2015/07/30 33 2016/08/17
7 2013/08/09 16 2014/08/28 25 2015/08/23 34 2016/09/10
8 2013/09/02 17 2014/09/21 26 2015/10/10 35 2016/10/28
9 2013/09/26 18 2014/11/08 27 2016/02/07
Tab.2  Data list of RADARSAT-2
编号 日期 编号 日期 编号 日期 编号 日期
1 2012/12/06 4 2013/04/28 7 2013/09/29 10 2013/12/04
2 2013/02/10 5 2013/06/11 8 2013/10/21 11 2013/12/26
3 2013/03/15 6 2013/08/27 9 2013/11/12
Tab.3  Data list of TerraSAR-X
Fig.2  Baseline graph of interferometric images combination
Fig.3  Subsidence velocity map of Tangshan urban area in 2013
Fig.4  Comparison of different profile data in 2013
Fig.5  Tiny differential deformation of active fault in the study area from 2013 to 2016
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