Active deformation of coastal plain near the deformation front in SW Taiwan by persistent SAR interferometry
Taiwan is situated along the collision boundary between the Eurasian plate and Philippine Sea plate and the ongoing subduction with different polarity occurs in northeastern and southwestern offshore area near Taiwan. The northward extension of Manila trench losses its subduction signature and connects to the deformation front of an accretionary wedge offshore southwestern Taiwan and Taiwan orogenic mountain belt. The most southwestern surface exposure of the fold-and-thrust belt is considered along the western edge of the Tainan tableland, an elongated north-south-trending topography with an altitude of 20-25 m. It is the significant morphological feature of an active growing folding near the deformation front close to the foreland belt of southwestern Taiwan. The fast uplift rate of about 1 cm/yr and the nonlinear deformation rate across the Tainan tableland have been well studied by GPS, DInSAR, PSInSAR and precise leveling. The new results of PSInSAR from 2005 to 2008 demonstrate a deformation rate change along the LOS toward to satellite of 5-10 mm/yr in Tawan lowland west of Houchiali fault. The previous study demonstrated a slight subsidence in the same area observed in 1995-1999. In addition, the maximum SRD rate of about 20 mm/yr are observed from the coastal plain northern of Hsinhua fault towards to the junction of the Hinshua, the Tsochen fault and Lonchou fault. This significant uplift area is located the southern margin of the Peikang High with high seismicity. It implies that the compressional deformation is propagated from western Foothills to coastal plain with active growing folding initiated by western propagation of major thrust systems.
PSInSAR deformation front fold-and-thrust belt Tainan tableland
Yuyia Wu Jyr-Ching Hu Chung-Pai Chang Chih-Heng Luc
Department of Geosciences, National Taiwan University, Taipei, Taiwan National Central University, Chungli, Taiwan
国内会议
哈尔滨
英文
1-5
2011-08-01（万方平台首次上网日期，不代表论文的发表时间）