HR: 0800h
AN: T51A-0313    [Abstracts]
TI: Preliminary results of surface deformation in suburban central Taiwan observed by PSInSAR
AU: * Yen, J
EM: jyyen@mail.nhlue.edu.tw
AF: Institute of Earth Sciences, National Hualien University of Education, No. 123, Huasi Rd., Hualien, 970, Taiwan
AU: Chang, C
EM: cpchang@csrsr.ncu.edu.tw
AF: Center for Space and Remote Sensing Research, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan
AU: Hung, W
EM: khung@ITRI.ORG.TW
AF: Energy & Resource Laboratories, Industrial Technology Research Institute, Bldg. 24, 195 Sec.4, Chung Hsing Rd., Chutung, 310, Taiwan
AU: Chen, K
EM: dkschen@csrsr.ncu.edu.tw
AF: Center for Space and Remote Sensing Research, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan
AU: Huan, J
EM: cheinway@mail.nctu.edu.tw
AF: Department of Civil Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, 300, Taiwan
AB: Precise leveling revealed up to 10 cm/yr of land subsidence occurred in the suburban central Taiwan during the past decades. Although the general trend of subsidence is known, the spatial pattern of subsidence and the exact nature of the subsidence is still far from clear. In order to quantify different types of deformation and further mitigate the hazards caused by both tectonic and anthropogenic activities, many geodetic measurements were deployed in Taiwan. However, the spatial density of these geodetic measurements were generally very low due to the high cost of the instrument or the time required for the campaign. An alternative method was using SAR interferometry, however, the vegetations and farmland in central Taiwan prevent the radar signal from having high enough coherence to form meaningful interferogram. Persistent scatterer InSAR was therefore deployed in our study area to acquire the deformation signal. Radar images were processed using Diapason software to form interferograms and the phase signals were processed using Matlab. The result showed that a significant amount of area in central Taiwan was subjected to a very rapid subsidence rate of up to 10 cm/yr. Precise leveling in this area also provided evidence for such a rapid subsidence in this area. Further works are needed in order to precisely map out the area affected and find out the causes of the phenomenon.
DE: 1209 Tectonic deformation (6924)
DE: 1211 Non-tectonic deformation
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 8169 Sedimentary basin processes
SC: Tectonophysics [T]
MN: 2007 Fall Meeting