Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan

Jyr Ching Hu, Chin Shyong Hou, Li Chung Shen, Yu Chang Chan, Rou Fei Chen, Chung Huang, Ruey Juin Rau, Hui-Hsuan Chen, Chii Wen Lin, Mong Han Huang, Pei Fen Nien

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Four campaigns of dense GPS measurements have been conducted since 1995 to investigate crustal deformation patterns in SW Taiwan. The station velocities decrease westwards from 42.2 to 55.5 mm/yr along the azimuths from 247.1° to 272.5°. In central part of the study area, GPS stations move nearly toward the west, whereas in the Pingtung-Kaohsiung coastal area, displacement vectors demonstrate a clear counter-clockwise deviation toward the SW. The transtensional deformation and the along-strike variation of southward increase of extensional deformation is due to the low lateral confining conditions related to the Manila subduction zone as a free boundary or/and the presence of the prominent Peikang High as a rigid indentor. The Chishan Fault is dominated by right-lateral motion with a fault slip rate ∼7 mm/yr in a N50°W direction. The Kaoping Fault is dominated by left-lateral motion with a ∼4-8 mm/yr in a N-S direction. The significant right-lateral component of motion of ∼24-30 mm/yr is accommodated along the active structures west of the Chishan Fault. The right-lateral and left-lateral structures facilitate the southwestward extrusion. The velocity gradients of the GPS stations across the Chaochou Fault are not significant. This implies that the Chaochou Fault is locked along the fault plane.

Original languageEnglish
Pages (from-to)287-302
Number of pages16
JournalJournal of Asian Earth Sciences
Volume31
Issue number3
DOIs
Publication statusPublished - 2007 Nov 15

Fingerprint

extrusion
GPS
crustal deformation
slip rate
fault slip
fault plane
azimuth
subduction zone
station

Keywords

  • Active fault
  • Crustal deformation
  • GPS
  • Taiwan

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan. / Hu, Jyr Ching; Hou, Chin Shyong; Shen, Li Chung; Chan, Yu Chang; Chen, Rou Fei; Huang, Chung; Rau, Ruey Juin; Chen, Hui-Hsuan; Lin, Chii Wen; Huang, Mong Han; Nien, Pei Fen.

In: Journal of Asian Earth Sciences, Vol. 31, No. 3, 15.11.2007, p. 287-302.

Research output: Contribution to journalArticle

Hu, Jyr Ching ; Hou, Chin Shyong ; Shen, Li Chung ; Chan, Yu Chang ; Chen, Rou Fei ; Huang, Chung ; Rau, Ruey Juin ; Chen, Hui-Hsuan ; Lin, Chii Wen ; Huang, Mong Han ; Nien, Pei Fen. / Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan. In: Journal of Asian Earth Sciences. 2007 ; Vol. 31, No. 3. pp. 287-302.
@article{c13ec68055cc4f6aa074fedd369ea930,
title = "Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan",
abstract = "Four campaigns of dense GPS measurements have been conducted since 1995 to investigate crustal deformation patterns in SW Taiwan. The station velocities decrease westwards from 42.2 to 55.5 mm/yr along the azimuths from 247.1° to 272.5°. In central part of the study area, GPS stations move nearly toward the west, whereas in the Pingtung-Kaohsiung coastal area, displacement vectors demonstrate a clear counter-clockwise deviation toward the SW. The transtensional deformation and the along-strike variation of southward increase of extensional deformation is due to the low lateral confining conditions related to the Manila subduction zone as a free boundary or/and the presence of the prominent Peikang High as a rigid indentor. The Chishan Fault is dominated by right-lateral motion with a fault slip rate ∼7 mm/yr in a N50°W direction. The Kaoping Fault is dominated by left-lateral motion with a ∼4-8 mm/yr in a N-S direction. The significant right-lateral component of motion of ∼24-30 mm/yr is accommodated along the active structures west of the Chishan Fault. The right-lateral and left-lateral structures facilitate the southwestward extrusion. The velocity gradients of the GPS stations across the Chaochou Fault are not significant. This implies that the Chaochou Fault is locked along the fault plane.",
keywords = "Active fault, Crustal deformation, GPS, Taiwan",
author = "Hu, {Jyr Ching} and Hou, {Chin Shyong} and Shen, {Li Chung} and Chan, {Yu Chang} and Chen, {Rou Fei} and Chung Huang and Rau, {Ruey Juin} and Hui-Hsuan Chen and Lin, {Chii Wen} and Huang, {Mong Han} and Nien, {Pei Fen}",
year = "2007",
month = "11",
day = "15",
doi = "10.1016/j.jseaes.2006.07.020",
language = "English",
volume = "31",
pages = "287--302",
journal = "Journal of Asian Earth Sciences",
issn = "1367-9120",
publisher = "Elsevier Limited",
number = "3",

}

TY - JOUR

T1 - Fault activity and lateral extrusion inferred from velocity field revealed by GPS measurements in the Pingtung area of southwestern Taiwan

AU - Hu, Jyr Ching

AU - Hou, Chin Shyong

AU - Shen, Li Chung

AU - Chan, Yu Chang

AU - Chen, Rou Fei

AU - Huang, Chung

AU - Rau, Ruey Juin

AU - Chen, Hui-Hsuan

AU - Lin, Chii Wen

AU - Huang, Mong Han

AU - Nien, Pei Fen

PY - 2007/11/15

Y1 - 2007/11/15

N2 - Four campaigns of dense GPS measurements have been conducted since 1995 to investigate crustal deformation patterns in SW Taiwan. The station velocities decrease westwards from 42.2 to 55.5 mm/yr along the azimuths from 247.1° to 272.5°. In central part of the study area, GPS stations move nearly toward the west, whereas in the Pingtung-Kaohsiung coastal area, displacement vectors demonstrate a clear counter-clockwise deviation toward the SW. The transtensional deformation and the along-strike variation of southward increase of extensional deformation is due to the low lateral confining conditions related to the Manila subduction zone as a free boundary or/and the presence of the prominent Peikang High as a rigid indentor. The Chishan Fault is dominated by right-lateral motion with a fault slip rate ∼7 mm/yr in a N50°W direction. The Kaoping Fault is dominated by left-lateral motion with a ∼4-8 mm/yr in a N-S direction. The significant right-lateral component of motion of ∼24-30 mm/yr is accommodated along the active structures west of the Chishan Fault. The right-lateral and left-lateral structures facilitate the southwestward extrusion. The velocity gradients of the GPS stations across the Chaochou Fault are not significant. This implies that the Chaochou Fault is locked along the fault plane.

AB - Four campaigns of dense GPS measurements have been conducted since 1995 to investigate crustal deformation patterns in SW Taiwan. The station velocities decrease westwards from 42.2 to 55.5 mm/yr along the azimuths from 247.1° to 272.5°. In central part of the study area, GPS stations move nearly toward the west, whereas in the Pingtung-Kaohsiung coastal area, displacement vectors demonstrate a clear counter-clockwise deviation toward the SW. The transtensional deformation and the along-strike variation of southward increase of extensional deformation is due to the low lateral confining conditions related to the Manila subduction zone as a free boundary or/and the presence of the prominent Peikang High as a rigid indentor. The Chishan Fault is dominated by right-lateral motion with a fault slip rate ∼7 mm/yr in a N50°W direction. The Kaoping Fault is dominated by left-lateral motion with a ∼4-8 mm/yr in a N-S direction. The significant right-lateral component of motion of ∼24-30 mm/yr is accommodated along the active structures west of the Chishan Fault. The right-lateral and left-lateral structures facilitate the southwestward extrusion. The velocity gradients of the GPS stations across the Chaochou Fault are not significant. This implies that the Chaochou Fault is locked along the fault plane.

KW - Active fault

KW - Crustal deformation

KW - GPS

KW - Taiwan

UR - http://www.scopus.com/inward/record.url?scp=35148833453&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35148833453&partnerID=8YFLogxK

U2 - 10.1016/j.jseaes.2006.07.020

DO - 10.1016/j.jseaes.2006.07.020

M3 - Article

AN - SCOPUS:35148833453

VL - 31

SP - 287

EP - 302

JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

SN - 1367-9120

IS - 3

ER -