HR: 0800h
AN: G21A-0109    [Abstracts]
TI: Application of DInSAR in Monitoring the Metropolitan Land-Surface Deformation: Jungli Industry Park as an Example
AU: * Chang, C
EM: cpchang@csrsr.ncu.edu.tw
AF: Center for Space and Remote Sensing Research, National Central University, 300, Jungda Rd., Jungli, 320 Taiwan
AU: Ho, S
EM: u8107200@cc.ncu.edu.tw
AF: Institute of Geophysics, National Central University, 300, Jungda Rd., Jungli, 320 Taiwan
AB: Measuring the crustal deformation caused by human activity is difficult, because it­Ýs local and unsteady. Moreover, human activity is generally concentrated in urban areas, where cover and shadow from buildings raise errors in GPS observation. In this study, we try to use the InSAR technique to overcome this task. Ten ERS1/2-SAR images recorded in the last ten years are used for determining the land-surface deformation in the Jungli Industry Park in northern Taiwan. The interferometric results reveal a circular-shape subsidence, which is situated within center of this industry park. Quantitative analysis shows that this subsidence event occurred from 1996, reached its maximum rate around 1999, and ceased after 2000. The rapid change of subsidence rate and the circular-shape distribution indicate that the artificial influence, for example, groundwater pumping may be important factor for the land subsidence of the Jungli Industry Park. In fact, our field investigation shows that a steel factory located within the park center had largely pumped groundwater for its cooling system since 1996. This factory has moved out in 2000. Therefore, we can believe that the land-subsidence of this area occurs as dewatering of the acquifer below reduces the buoyant support of the sediments. A numerical simulation of land subsidence in terms of discharge/recharge of groundwater has also been carried out in this study. This simulation can substantiate in advance the relationship between the land deformation and the groundwater influence for the Jungli area.
DE: 8107 Continental neotectonics
DE: 8158 Plate motions--present and recent (3040)
DE: 1206 Crustal movements--interplate (8155)
DE: 1208 Crustal movements--intraplate (8110)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting