Fifteen years of surface deformation in Western Taiwan: Insight from SAR interferometry
Journal
Tectonophysics
Journal Volume
692
Pages
252-264
Date Issued
2016
Author(s)
Abstract
Geodetically measured surface displacements are produced by a combination of underlying deformation processes acting at different spatial and temporal scales. A complete history of surface measurements in an area can help discriminate contributions from tectonic, hydrologic, and anthropogenic processes. In this study, we use Synthetic Aperture Radar (SAR) images of the active mountain front and adjacent coastal plain of southwestern Taiwan to generate time series of surface deformation from 1995 to 2001 and from 2005 to 2008 based on the InSAR small baseline method. The InSAR measurements agree well with LOS motions estimated from continuous GPS measurements of 3D displacements between 2006 and 2008. A significant range increase in line of sight (LOS) is dominated by land subsidence in the coastal area of western and southwestern Taiwan. Subsidence rates vary with annual periods and are highly correlated with seasonal precipitation, which are likely associated with groundwater recharge and withdrawal. The long-term deformation is dominated by long-term tectonic loading in SW Taiwan during the interseismic period of the earthquake cycle, including elastic strain along or continuous creep on the active faults. Our results show the ability of InSAR to reveal spatiotemporal crustal deformation in western Taiwan with high spatial resolution and accuracy, which is potentially important for evaluating seismic hazards. © 2016 Elsevier B.V.
Subjects
Crustal deformation; InSAR; Land subsidence; Taiwan
Other Subjects
Creep; Deformation; Faulting; Groundwater; Interferometry; Subsidence; Surface measurement; Tectonics; Crustal deformations; High spatial resolution; InSAR; Land subsidence; Seasonal precipitations; Spatial and temporal scale; Synthetic aperture radar (SAR) images; Taiwan; Synthetic aperture radar; accuracy assessment; active fault; coastal plain; crustal deformation; GPS; radar interferometry; seismic hazard; seismotectonics; spatiotemporal analysis; synthetic aperture radar; time series analysis; Taiwan
Type
journal article