Present-day kinematics of active mountain building in Taiwan from GPS observations during 1995-2005

Kuo-En Ching, Ruey-Juin Rau, Kaj M. Johnson, Jian Cheng Lee, Jyr Ching Hu

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We characterize the kinematics of modern crustal deformation in Taiwan and evaluate the potential for large earthquakes by computing tectonic block motions and fault slip rates from 531 GPS horizontal velocities. These new GPS velocity field indicates that lateral extrusion in the southern transition from collision to subduction is primarily achieved by motion along several major reverse faults and internal distortion of blocks. The northern transition is characterized by asymmetric opening of the Okinawa trough and collision-induced rotation between the Ryukyu trench and Okinawa trough. We suggest that the differences in style of deformation in northern and southern Taiwan are a result of differences in trenchward motions between the overriding plate and forearc sliver. Along-strike variations in basin thickness and the presence of foreland basement obstacles in central Taiwan result in clockwise rotation with sinistral motion on faults and counterclockwise rotation with dextral motion on faults north and south of the obstacle, respectively. In eastern Taiwan, high slip rate of ∼43 mm/yr on the southern Longitudinal Valley fault (LVF) is responsible for the full collision of Taiwan orogeny. E-W syn-orogenic extension in the southern Central Range has been inferred by our model. Patches with high slip rate deficits on the LVF and the Chelungpu fault from our model, respectively, mainly correspond to the source areas of the 1951 M 7.1 Longitudinal Valley earthquake sequence and of the 1999 Mw 7.6 Chi-Chi earthquake.

Original languageEnglish
Article numberB09405
JournalJournal of Geophysical Research: Solid Earth
Volume116
Issue number9
DOIs
Publication statusPublished - 2011 Sep 1

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Taiwan
mountains
Global positioning system
Earthquakes
Kinematics
kinematics
GPS
slip rate
mountain
valleys
Fault slips
slip
earthquakes
collision
troughs
valley
earthquake
collisions
Tectonics
trough

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

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abstract = "We characterize the kinematics of modern crustal deformation in Taiwan and evaluate the potential for large earthquakes by computing tectonic block motions and fault slip rates from 531 GPS horizontal velocities. These new GPS velocity field indicates that lateral extrusion in the southern transition from collision to subduction is primarily achieved by motion along several major reverse faults and internal distortion of blocks. The northern transition is characterized by asymmetric opening of the Okinawa trough and collision-induced rotation between the Ryukyu trench and Okinawa trough. We suggest that the differences in style of deformation in northern and southern Taiwan are a result of differences in trenchward motions between the overriding plate and forearc sliver. Along-strike variations in basin thickness and the presence of foreland basement obstacles in central Taiwan result in clockwise rotation with sinistral motion on faults and counterclockwise rotation with dextral motion on faults north and south of the obstacle, respectively. In eastern Taiwan, high slip rate of ∼43 mm/yr on the southern Longitudinal Valley fault (LVF) is responsible for the full collision of Taiwan orogeny. E-W syn-orogenic extension in the southern Central Range has been inferred by our model. Patches with high slip rate deficits on the LVF and the Chelungpu fault from our model, respectively, mainly correspond to the source areas of the 1951 M 7.1 Longitudinal Valley earthquake sequence and of the 1999 Mw 7.6 Chi-Chi earthquake.",
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Present-day kinematics of active mountain building in Taiwan from GPS observations during 1995-2005. / Ching, Kuo-En; Rau, Ruey-Juin; Johnson, Kaj M.; Lee, Jian Cheng; Hu, Jyr Ching.

In: Journal of Geophysical Research: Solid Earth, Vol. 116, No. 9, B09405, 01.09.2011.

Research output: Contribution to journalArticle

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