Coseismic deformation revealed by inversion of strong motion and GPS data: The 2003 Chengkung earthquake in eastern Taiwan

Jyr Ching Hu, Li Wei Cheng, Horng Yue Chen, Yih Min Wu, Jian Cheng Lee, Yue Gau Chen, Kuan Chuan Lin, Ruey Juin Rau, Hao Kuochen, Hui Hsuan Chen, Shui Bei Yu, Jacques Angelier

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A moderate earthquake of Mw = 6.8 occurred on 2003 December 10. It ruptured the Chihshang Fault in eastern Taiwan which is the most active segment of the Longitudinal fault as a plate suture fault between the Luzon arc of the Philippine Sea plate and the Eurasian plate. The largest coseismic displacements were 13 cm (horizontal) and 26 cm (vertical). We analyse 40 strong motion and 91 GPS data to model the fault geometry and coseismic dislocations. The most realistic shape of the Chihshang fault surface is listric in type. The dipping angle of the seismic zone is steep (about 60°-70°) at depths shallower than 10 km and then gradually decreases to 40°-50° at depths of 20-30 km. Thus the polygonal elements in Poly3D are well suited for modelling complex surfaces with curving boundaries. Using the strong motion data, the displacement reaches 1.2 m dip-slip on the Chihshang Fault and decreases to 0.1 m near surface. The slip averages 0.34 m, releasing a scalar moment of 1.6E26 dyne-cm. For GPS data, our model reveals that the maximal dislocation is 1.8 m dip-slip. The dislocations decrease to 0.1 m near the surface. The average slip is 0.48 m, giving a scalar moment of 2.2E26 dyne-cm. Regarding post-seismic deformation, a displacements of 0.5 m were observed near the Chihshang Fault, indicating the strain had not been totally released, as a probable result of near-surface locking of the fault zone.

Original languageEnglish
Pages (from-to)667-674
Number of pages8
JournalGeophysical Journal International
Volume169
Issue number2
DOIs
Publication statusPublished - 2007 May

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Taiwan
strong motion
Global positioning system
Earthquakes
GPS
earthquakes
inversions
slip
earthquake
dislocation
dip-slip fault
scalars
moments
Philippines
Philippine Sea plate
fault geometry
Eurasian plate
seismic zone
releasing
dipping

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Hu, Jyr Ching ; Cheng, Li Wei ; Chen, Horng Yue ; Wu, Yih Min ; Lee, Jian Cheng ; Chen, Yue Gau ; Lin, Kuan Chuan ; Rau, Ruey Juin ; Kuochen, Hao ; Chen, Hui Hsuan ; Yu, Shui Bei ; Angelier, Jacques. / Coseismic deformation revealed by inversion of strong motion and GPS data : The 2003 Chengkung earthquake in eastern Taiwan. In: Geophysical Journal International. 2007 ; Vol. 169, No. 2. pp. 667-674.
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title = "Coseismic deformation revealed by inversion of strong motion and GPS data: The 2003 Chengkung earthquake in eastern Taiwan",
abstract = "A moderate earthquake of Mw = 6.8 occurred on 2003 December 10. It ruptured the Chihshang Fault in eastern Taiwan which is the most active segment of the Longitudinal fault as a plate suture fault between the Luzon arc of the Philippine Sea plate and the Eurasian plate. The largest coseismic displacements were 13 cm (horizontal) and 26 cm (vertical). We analyse 40 strong motion and 91 GPS data to model the fault geometry and coseismic dislocations. The most realistic shape of the Chihshang fault surface is listric in type. The dipping angle of the seismic zone is steep (about 60°-70°) at depths shallower than 10 km and then gradually decreases to 40°-50° at depths of 20-30 km. Thus the polygonal elements in Poly3D are well suited for modelling complex surfaces with curving boundaries. Using the strong motion data, the displacement reaches 1.2 m dip-slip on the Chihshang Fault and decreases to 0.1 m near surface. The slip averages 0.34 m, releasing a scalar moment of 1.6E26 dyne-cm. For GPS data, our model reveals that the maximal dislocation is 1.8 m dip-slip. The dislocations decrease to 0.1 m near the surface. The average slip is 0.48 m, giving a scalar moment of 2.2E26 dyne-cm. Regarding post-seismic deformation, a displacements of 0.5 m were observed near the Chihshang Fault, indicating the strain had not been totally released, as a probable result of near-surface locking of the fault zone.",
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Hu, JC, Cheng, LW, Chen, HY, Wu, YM, Lee, JC, Chen, YG, Lin, KC, Rau, RJ, Kuochen, H, Chen, HH, Yu, SB & Angelier, J 2007, 'Coseismic deformation revealed by inversion of strong motion and GPS data: The 2003 Chengkung earthquake in eastern Taiwan', Geophysical Journal International, vol. 169, no. 2, pp. 667-674. https://doi.org/10.1111/j.1365-246X.2007.03359.x

Coseismic deformation revealed by inversion of strong motion and GPS data : The 2003 Chengkung earthquake in eastern Taiwan. / Hu, Jyr Ching; Cheng, Li Wei; Chen, Horng Yue; Wu, Yih Min; Lee, Jian Cheng; Chen, Yue Gau; Lin, Kuan Chuan; Rau, Ruey Juin; Kuochen, Hao; Chen, Hui Hsuan; Yu, Shui Bei; Angelier, Jacques.

In: Geophysical Journal International, Vol. 169, No. 2, 05.2007, p. 667-674.

Research output: Contribution to journalArticle

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T1 - Coseismic deformation revealed by inversion of strong motion and GPS data

T2 - The 2003 Chengkung earthquake in eastern Taiwan

AU - Hu, Jyr Ching

AU - Cheng, Li Wei

AU - Chen, Horng Yue

AU - Wu, Yih Min

AU - Lee, Jian Cheng

AU - Chen, Yue Gau

AU - Lin, Kuan Chuan

AU - Rau, Ruey Juin

AU - Kuochen, Hao

AU - Chen, Hui Hsuan

AU - Yu, Shui Bei

AU - Angelier, Jacques

PY - 2007/5

Y1 - 2007/5

N2 - A moderate earthquake of Mw = 6.8 occurred on 2003 December 10. It ruptured the Chihshang Fault in eastern Taiwan which is the most active segment of the Longitudinal fault as a plate suture fault between the Luzon arc of the Philippine Sea plate and the Eurasian plate. The largest coseismic displacements were 13 cm (horizontal) and 26 cm (vertical). We analyse 40 strong motion and 91 GPS data to model the fault geometry and coseismic dislocations. The most realistic shape of the Chihshang fault surface is listric in type. The dipping angle of the seismic zone is steep (about 60°-70°) at depths shallower than 10 km and then gradually decreases to 40°-50° at depths of 20-30 km. Thus the polygonal elements in Poly3D are well suited for modelling complex surfaces with curving boundaries. Using the strong motion data, the displacement reaches 1.2 m dip-slip on the Chihshang Fault and decreases to 0.1 m near surface. The slip averages 0.34 m, releasing a scalar moment of 1.6E26 dyne-cm. For GPS data, our model reveals that the maximal dislocation is 1.8 m dip-slip. The dislocations decrease to 0.1 m near the surface. The average slip is 0.48 m, giving a scalar moment of 2.2E26 dyne-cm. Regarding post-seismic deformation, a displacements of 0.5 m were observed near the Chihshang Fault, indicating the strain had not been totally released, as a probable result of near-surface locking of the fault zone.

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