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Volume 58 Supplement 1

Special Issue: Special Section for the 2005 West Off Fukuoka Prefecture Earthquake (1)

Coseismic and postseismic surface displacements of the 10 December 2003 (MW 6.5) Chengkung, eastern Taiwan, earthquake

Abstract

The MW 6.5 Chengkung earthquake occurred in eastern Taiwan at 04:38 UTC on 10 December 2003. The GPS data from eighteen continuously recording stations (CORS) and 86 campaign-surveyed stations (CSS) collected 18 days to 9 months before and 6 days to 4 months after the main shock are utilized to analyze the coseismic and postseismic deformation associated with the Chengkung earthquake. The earthquake resulted from rupturing of the Chihshang fault, a 25-km-long segment of the Longitudinal Valley Fault (LVF). The coseismic horizontal displacements in the hanging wall showed a fan-shape distribution with vectors towards the west. On the other hand, the movements of the revealed a mirror fan-shape with relatively lesser amounts of displacement. The largest coseismic displacement, which reached 126 mm and 263 mm in the horizontal and vertical components, occurred near the epicenter area in the hanging wall. The largest postseismic displacements in 109 days, which approached 59 mm and 68 mm in the horizontal and vertical components, occurred near the surface trace of the Chihshang fault (TAPO) and near the epicenter area (CHEN), respectively. The stations near the Chihshang fault indicated a more significant postseismic displacement than coseismic one.

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Correspondence to Horng-Yue Chen.

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Chen, HY., Yu, SB., Kuo, LC. et al. Coseismic and postseismic surface displacements of the 10 December 2003 (MW 6.5) Chengkung, eastern Taiwan, earthquake. Earth Planet Sp 58, 5–21 (2006). https://doi.org/10.1186/BF03351908

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Key words

  • Coseismic displacement
  • postseismic deformation
  • Chengkung earthquake
  • Longitudinal Valley Fault