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In-situ stress at the northern portion of the Chelungpu fault, Taiwan, estimated on boring cores recovered from a 2-km-deep hole of TCDP

Earth, Planets and Space volume 60, pages 809–819 (2008)Cite this article

Abstract

We have investigated the depth variation in the stress state at the northern part of the Chelungpu fault, Taiwan, which slipped during the 1999 Chi-Chi earthquake (Mw 7.6). In-situ stress around the fault was estimated based on the stress memory of rocks recovered from five depths (739–1316 m) of a 2-km-deep-hole. The borehole intersects a fault zone at a depth of 1111 m (FZ1111), which is the best candidate for the Chelungpu fault. Our main results are: (1) the SHmax direction is parallel to the slip for the Chi-Chi earthquake and agrees with those of the local, regional, or tectonic scales estimated from various stress indicators; (2) significant aspects of the stress field are identical to those of paleostress; (3) the horizontal differential stress was significantly reduced just above FZ1111, which may be attributable to the existence of a significantly deformable zone at this depth.

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Authors and Affiliations

  1. Observation Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Yasuo Yabe

  2. Department of Geosciences, National Taiwan University, P. O. Box 13-318, Taipei, 106, Taiwan

    Sheng-Rong Song

  3. Institute of Geophysics, National Central University, No. 300, Jhongda Rd., Jhongli, 32001, Taiwan

    Chien-Ying Wang

Authors
  1. Yasuo Yabe
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  2. Sheng-Rong Song
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  3. Chien-Ying Wang
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Correspondence to Yasuo Yabe.

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Yabe, Y., Song, SR. & Wang, CY. In-situ stress at the northern portion of the Chelungpu fault, Taiwan, estimated on boring cores recovered from a 2-km-deep hole of TCDP. Earth Planet Sp 60, 809–819 (2008). https://doi.org/10.1186/BF03352832

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  • DOI: https://doi.org/10.1186/BF03352832

Key words

  • 1999 Chi-Chi earthquake
  • Chelungpu fault
  • TCDP
  • crustal stress
  • stress memory
  • core method