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Using differential SAR interferometry to map land subsidence: a case study in the Pingtung Plain of SW Taiwan 总被引:3,自引:2,他引:1
Hsieh Chia-Sheng Shih Tian-Yuan Hu Jyr-Ching Tung Hsin Huang Mong-Han Angelier Jacques 《Natural Hazards》2011,58(3):1311-1332
Synthetic aperture radar (SAR) interferometry (InSAR) is a geodetic tool widely applied in the studies of earth-surface deformation.
This technique has the benefits of high spatial resolution and centimetre-scale accuracy. Differential SAR interferometry
(DInSAR) is used to measure ground deformation with repeat-pass SAR images. This study applied DInSAR and persistent scatterers
InSAR (PSInSAR) for detecting land subsidence in the Pingtung Plain, southern Taiwan, between 1995 and 2000. In recent years,
serious land subsidence occurred along coastal regions of Taiwan as a consequence of over-pumping of underground water. Results
of this study revealed that the critical subsidence region is located on the coast near the estuary of Linpien River. It is
also found that subsidence was significantly higher during the dry season than the wet season. The maximum annual subsidence
rate of the dry season is up to −11.51 cm/year in critical subsidence region and the vertical land movement rate is much slower
during the wet season. The average subsidence rates in wet and dry seasons are −0.31 and −3.37 cm/year, respectively. As a
result, the subsidence rate in dry seasons is about 3 cm larger than in wet seasons. 相似文献
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On 12th May 2008, a MW7.9 earthquake occurred on the Longmenshan fault in the mountains to the west of Sichuan Province, which shook many Asian cities and killed at least 69 000 people. 相似文献
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