Rapid deformation rates due to development of diapiric anticline in southwestern Taiwan from geodetic observations

Kuo-En Ching, Jonathan R. Gourley, Yuan Hsi Lee, Shu Chin Hsu, Kwo Hwa Chen, Chien Liang Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We adopted 106 campaign-mode GPS observations and 310 precise leveling measurements between 2002 and 2010 to understand the present-day crustal deformation in mudstone area and to estimate the earthquake potential of the Hsiaokangshan (HKSF) and the Chishan faults (CHNF) in southwest Taiwan. Horizontal velocities east of the CHNF are ~ 66 mm/yr, 270° and gradually decrease westward to ~ 15 mm/yr, N259°. A horizontal velocity gradient of ~ 15 mm/yr is shown between the HKSF and CHNF. Subsidence rates west of the HKSF and east of the CHNF are ~ 5–10 mm/yr, while the uplift is observed between these two faults in the highest elevation with the maximum rate of ~ 18 mm/yr. The observed deformation patterns are difficult to be fully modeled by 2D kinematic fault model. Field relationships within the vertical shear zones of the mudstone therefore indicate that the deformation pattern may be also controlled by a relic onshore mud diapir that is still experiencing vertical uplift. Consistency between the geological and geodetic vertical velocities, weak rock strength, and no destructive earthquakes over the last 100 years imply that faults (HKSF) within the mudstone area are creeping. However, the CHNF or the associated décollement may still have earthquake potential.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalTectonophysics
Volume692
DOIs
Publication statusPublished - 2016 Dec 5

Fingerprint

anticlines
Taiwan
anticline
earthquakes
leveling
mud
subsidence
mudstone
kinematics
earthquake
rocks
shear
gradients
uplift
estimates
weak rock
diapir
rate
crustal deformation
shear zone

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth-Surface Processes

Cite this

Ching, Kuo-En ; Gourley, Jonathan R. ; Lee, Yuan Hsi ; Hsu, Shu Chin ; Chen, Kwo Hwa ; Chen, Chien Liang. / Rapid deformation rates due to development of diapiric anticline in southwestern Taiwan from geodetic observations. In: Tectonophysics. 2016 ; Vol. 692. pp. 241-251.
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Rapid deformation rates due to development of diapiric anticline in southwestern Taiwan from geodetic observations. / Ching, Kuo-En; Gourley, Jonathan R.; Lee, Yuan Hsi; Hsu, Shu Chin; Chen, Kwo Hwa; Chen, Chien Liang.

In: Tectonophysics, Vol. 692, 05.12.2016, p. 241-251.

Research output: Contribution to journalArticle

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