Shyu, J. Bruce H. and Sieh, Kerry and Chen, Yue-Gau and Chuang, Ray Y. and Wang, Yu and Chung, Ling-Ho
Geomorphology of the southernmost Longitudinal Valley fault: Implications for evolution of the active suture of eastern Taiwan.
Art. No. TC1019.
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In order to understand fully the deformational patterns of the Longitudinal Valley fault system, a major structure along the eastern suture of Taiwan, we mapped geomorphic features near the southern end of the Longitudinal Valley, where many well-developed fluvial landforms record deformation along multiple strands of the fault. Our analysis shows that the Longitudinal Valley fault there comprises two major strands. The Luyeh strand, on the west, has predominantly reverse motion. The Peinan strand, on the east, has a significant left-lateral component. Between the two strands, late Quaternary fluvial sediments and surfaces exhibit progressive deformation. The Luyeh strand dies out to the north, where it steps to the east and joins the Peinan strand to become the main strand of the reverse sinistral Longitudinal Valley fault. To the south, the Luyeh strand becomes an E-W striking monocline. This suggests that the reverse motion on the Longitudinal Valley system decreases drastically at that point. The Longitudinal Valley fault system is therefore likely to terminate abruptly there and does not seem to connect to any existing structure further to the south. This abrupt structural change suggests that the development of the Longitudinal Valley suture occurs through discrete structural “jumps,” rather than by a continuous northward maturation.
|Additional Information:||© 2008 American Geophysical Union.
Received 16 October 2006; revised 3 September 2007; accepted 26 October 2007; published 29 February 2008.
We greatly appreciate the assistance of Y.-C.
Chen and T. Watanuki in the field. We have benefited significantly from the
information collected by and the stimulating discussions with the students
of two bi-national field classes of the National Taiwan University and
Caltech, held in the Peinanshan area in 2001 and 2005. We are also grateful
for valuable discussions with H.-T. Chu, J.-C. Lee, W.-T. Liang, D. V.
Wiltschko, Y.-M. Wu, and S.-B. Yu. Our mapping was facilitated by
J. Giberson, manager of the Caltech’s GIS laboratory. The 5-m DEM was
generously provided by the Central Geological Survey, MOEA, Taiwan.
Radiocarbon dating by M. Kashgarian in the Center for Accelerator Mass
Spectrometry, Lawrence Livermore National Laboratory, is greatly appreciated.
The comments and suggestions of E. Kirby and two anonymous
reviewers greatly helped us improve this manuscript. Our project in Taiwan
was supported by NSF grant EAR-0208505 and by the Gordon and Betty
Moore Foundation. This is Caltech Tectonics Observatory Contribution
|Group:||Caltech Tectonics Observatory, Caltech Tectonics Observatory. Taiwan Tectonics and Seismicity|
|Funding Agency||Grant Number|
|Gordon and Betty Moore Foundation||UNSPECIFIED|
|Subject Keywords:||Taiwan; tectonic geomorphology; Longitudinal Valley fault; river terraces; sutures
|Other Numbering System:|
|Other Numbering System Name||Other Numbering System ID|
|Caltech Tectonics Observatory||28|
|Official Citation:||Shyu, J. B. H., K. Sieh, Y.-G. Chen, R. Y. Chuang, Y. Wang, and L.-H. Chung (2008), Geomorphology of the southernmost Longitudinal Valley fault: Implications for evolution of the active suture of eastern Taiwan, Tectonics, 27, TC1019, doi:10.1029/2006TC002060|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited On:||17 Nov 2010 21:55|
|Last Modified:||18 Apr 2017 19:39|
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