Monitoring of Surface Deformation in Northern Taiwan Using InSAR Techniques
Speaker: Kai-Ting Fan
Abstract
Synthetic aperture radar (SAR) interferometry is a technique that provides high-resolution measurements of the ground displacement associated with many geophysical processes. We investigated the surface deformation of the northern Taiwan area, including the Taipei basin and its surrounding mountainous areas using the SAR interferometry. Although the Taipei basin now is well developed and amenable to research gathering using the D ifferential I nterferometric S ynthetic A perture R adar (DInSAR) technique, the mountainous areas surrounding the basin are densely covered with various vegetation inducing high noise ratio in interferograms. As a result, we developed the P ersistent S catterer (PS) InSAR and Small baseline InSAR technique to extract the phase signal of the chosen PS points, and the analysis result shows that the atmospheric disturbance and DEM residual can be successfully reduced and the precise information of surface deformation can be effectively obtained by the PSInSAR and Small baseline InSAR technique not only in the basin but also in the mountainous areas. Integrating these results, we observed deformation events in northern Taiwan including the the slight uplift in the Western Foothills, the Tatun volcanoes, the Linkou Tableland and t he displacements along the Shanchiao and Chinshan Faults are large enough to be observed.
Reference
Chang, C. P., J. Y. Yen, A. Hooper, F. M. Chou, Y. A. Chen, C. S. Hou, W. C. Hung, and M. S. Lin (2010), Monitoring of surface deformation in northern Taiwan using DInSAR and PSInSAR techniques. Terr. Atmos. Ocean., 21 (3), 447-461,doi: 10.3319/TAO.2009.11.20.01(TH).
Hooper, A. (2008), A multi-temporal InSAR method incorporating both persistent scatterer and small baseline approaches. Geophys. Res. Lett., 35, L16302, doi: 10.1029/2008GL034654.