Changes in paleostress and its magnitude related to seismic cycles in the Chelung-pu Fault, Taiwan

Yoshitaka Hashimoto, Kota Tobe, En-Chao Yeh, Weiren Lin, Sheng Rong Song

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5 Citations (Scopus)

Abstract

Paleostress analysis was conducted through a multiple stress inversion method using slip data recoded for the core samples from the Taiwan Chelung-pu Fault Drilling Project (TCDP). Two stress fields were obtained; one of these had horizontally plunging σ1, and the other has horizontally plunging σ2 or σ3 in the compressional stress direction of the Chi-Chi earthquake. Stress magnitude for both the stress fields was constrained by stress polygons, which indicated larger SHmax for horizontally plunging σ1 than that in the case of horizontally plunging σ2 or σ3. These differences in stress orientations and stress magnitude suggest that the change in stress filed can be caused by stress drop and stress buildup associated with seismic cycles. The seismic cycles recoded in the core samples from TCDP could include many events at geological timescale and not only the 1999 Chi-Chi earthquake.

Original languageEnglish
Pages (from-to)2418-2428
Number of pages11
JournalTectonics
Volume34
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

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Keywords

  • Taiwan
  • microfault inversion
  • paleostress
  • paleostress magnitude
  • seismic cycle
  • the Chelung-pu Fault

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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