利用InSAR技术研究青藏高原冻土形变特征

doi:10.12196/j.issn.1000-3274.2020.03.014

Abstract

Abstract: The geodetic observation network in the Tibetan Plateau (TP) is sparse due to the limitation of natural environment, which is insufficient for motoring regional crustal movement. Interferometric Synthetic Aperture Radar (InSAR) technique is an important method for monitoring crustal movement in a non-contact mode; however, it is affected by permafrost in the plateau. Based upon the C-band radar data collected by Sentinel-1 satellites during 2014~2018, this paper analyze the spatiotemporal characteristics of permafrost deformation using the InSAR technique. The spatial filtering is used to remove the localized common errors (e.g., the atmospheric delay and topographic effect) in InSAR displacement time series, and improve the signal-to-noise ratio of the data. The results show that there are two distinct categories of permafrost movements in the Tibetan Plateau: similar seasonal fluctuation and certain long-term subsidence in most permafrost areas, compared to nearby mountain (bedrock) region; and abnormal rapid subsidence in a few permafrost areas, e.g., the sedimentary basin to the southwestern of the Burog Co lake in central Tibet exists a cone-shaped subsidence region of the diameter of about 2 km and with a maximum subsidence rate of about 10±2.1 mm/a in the line-of-sight (LOS) direction. The tectonic activity in the plateau produced a large sum of rivers and lakes along the fault traces; and the permafrost is widely spread in riverbed or sedimentary basins. This poses great challenges for describing accurately tectonic deformation. The results obtained in this paper can be regarded as a helpful criterion for discerning between permafrost motion and tectonic deformation; and is useful for studies on physical properties and dynamic mechanism of permafrost.

Key words: InSAR, Permafrost, Subsidence, Tectonic deformation, Tibetan Plateau

CLC Number:

P315.7

LUO Yi, TIAN Yun-feng, ZHANG Su, ZHANG Jing-fa. Study on Characteristics of Permafrost Deformation in the Tibetan Plateau Using InSAR Technique[J]. EARTHQUAKE, 2020, 40(3): 179-188.

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Study on Characteristics of Permafrost Deformation in the Tibetan Plateau Using InSAR Technique

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