Science Service System

Summary of Proposal GEO1871

TitleMapping blind faults and subsidence regions in North China by combing TerraSAR-X InSAR time series with C/L-band InSAR systems and GPS data
Investigator Sun, Jianbao - Institute of Geology, China Earthquake Admnistration, Lab. Earthquake Dyanamics
Team Member
Associate Prof. Jianbo, Sun - Institute of Geology, China Earthquake Administration, Lab. of Earthquake Dynamic
Assistant Researcher Wang, Zhiguo - Beijing Earthquake Administration, N/A
Assistant Researcher Liang, Fang - Beijing Earthquake Administration, N/A
Prof. Wang, Min - Institute of Geology, China Earthquake Administration, Lab. of Earthquake Dynamic
Master student Zheng, Qian - Institute of Geology, China Earthquake Administration, InSAR crustal deformation, Lab. of Earthquake Dynamic
Master student Xuwei, Luo - Peking University, Geophysics department
SummaryNorth China is one of the most geologically complicated areas in the world suffering from various hazards, such as seismic, subsidence, landslides etc. The area hosts several very large cities in China and a large number of population. The geodesy approaches, such as GPS and InSAR, are vital tools to study hazards of this area, due to the facts that thick sedimentary covering blind faults, and great deformation gradients induced by exceeding water extraction. In the past tens of years, especially from the era of SAR satellites, a lot of radar data had been archived, while no through study has been made. In this proposal, we dedicate to study the complex deformation process of the area by utilizing multiple data sources, such as C/L/X-band SAR systems and GPS, to qualitatively and quantitatively define the seismic hazard and subsidence issues around this area. The radar data have different resolution, wavelengths, and acquisition times, which will be helpful for resolving multiple scale of crustal deformation, and identifying different origins of it, so that different hazards can be separated. Furthermore, the C/L/X-band SAR systems also span common time interval (with GPS measurements), and it would be useful for resolving 3D crustal deformation and analyzing the interactions of different sources, so that we can better understand the seismic and geological hazards of this area, and prepare for them. The TerraSAR-X data will be analyzed by time series analysis using both SBAS and PS-InSAR techniques for the test site across the study area, and calibrated and verified by projecting cGPS measurements into Line-of-Sight directions of radar satellites. By using this high-resolution data, the deformation retrieved from ALOS PALAR and ESA's satellite data can be better refined to the scale of a building. The major faults identified on PALSAR data, such as the NW-SE striking Nankou-Sunhe fault, can be mapped in great details by using TerraSAR-X data, so that the seismic potential of faults can be established. The fault motion will be quantitatively retrieved by excluding subsidence signals using 3D analysis of different SAR systems. The temporal evolution of crustal deformation with microseismicity will be used for tracing the interaction signals between subsidence and seismic events in their common acquisition times.

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DLR 2004-2016