Fault creep and segmentation of the Longitudinal Valley fault from PS-InSAR and Continuous GPS in eastern Taiwan
The Longitudinal Valley fault (LVF) is a plate suture fault between the Luzon arc of the Philippine Sea plate and the Chinese continental margin of the Eurasian plate, in eastern Taiwan. With respect to Paisha station, S01R, the stations of Coastal Range shows the velocities of 40.5-72.3 mm/yr towards azimuth 307°-309°. The stations in the Longitudinal Valley and Central Range revealed velocities in the range 19.0-49.3 mm/yr towards azimuths 285o-318o. This study presents the results about vertical velocity on the Coastal Range and Longitudinal Valley in eastern Taiwan from Continuous Global Positioning System using data acquired from 1999 to 2009. In the vertical velocity pattern, the significant subsidence appears in northern Coastal Range about -15.7 ±0.3 mm/yr, but the uplift in southern Coastal Range about 20.6 ±0.2 mm/yr respectively. Furthermore, the vertical variation presents a discontinuity across the Chihshang Fault nearly 28.9 ±1.2mm/yr. These results can be compared with Persistent Scatterer InSAR measurements using data acquired by ALOS satellite provided by JAXA to characterize the vertical deformation in different segments of the LVF. The obtained map of ground mean velocity for which displacements are measured along the line of sight, show surface deformation of the Valley with an unprecedented spatial density (about 40 points per km2). The striking feature is the nearly continuous superficial creeping phenomena along the LVF that vanished North of Yuli and south of Lu-Ye. Location of the creep is in very good agreement with field evidences of fault activity. Across the discontinuity, the relative change of LOS velocity is about 2 cm/year but shows significant variations along the fault which can be compared to other geodetic measurements.
Longitudinal Valley fault creeping segmentation, PS-InSAR,
Jyr-Ching Hu Johann Champenois Kuan-Chuan Lin Erwan Pathier Benoit
Department of Geosciences, National Taiwan University, Taipei, Taiwan Université Paris-Est, Marne-la-Vallée, France Geosciences Azur, Nice Sophia Antipolis University, Ni University Joseph Fourier, Grenoble, France ISTeP, UMR 7193 UPMC et ENSG, France
国内会议
哈尔滨
英文
1-4
2011-08-01（万方平台首次上网日期，不代表论文的发表时间）