An earthquake slip zone is a magnetic recorder

Yu Min Chou, Sheng Rong Song, Charles Aubourg, Teh Quei Lee, Anne Marie Boullier, Yen Fang Song, En-Chao Yeh, Li Wei Kuo, Chien Ying Wang

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

During an earthquake, the physical and the chemical transformations along a slip zone lead to an intense deformation within the gouge layer of a mature fault zone. Because the gouge contains ferromagnetic minerals, it has the capacity to behave as a magnetic recorder during an earthquake. This constitutes a conceivable way to identify earthquake slip zones. In this paper, we investigate the magnetic record of the Chelungpu fault gouge that hosts the principal slip zone of the Chi-Chi earthquake (Mw 7.6, 1999, Taiwan) using Taiwan Chelungpu-fault Drilling Project core samples. Rock magnetic investigation pinpoints the location of the Chi-Chi millimeter-thick principal slip zone within the 16 cm thick gouge at ~1 km depth. A modern magnetic dipole of Earth's magnetic field is recovered throughout this gouge, but not in the wall rocks nor in the two other adjacent fault zones. This magnetic record resides essentially in two magnetic minerals: magnetite in the principal slip zone, and neoformed goethite elsewhere in the gouge. We propose a model where the magnetic record (1) is preserved during interseismic time, (2) is erased during co-seismic time, and (3) is imprinted during post-seismic time when fluids cooled down. We suggest that the identification of a stable magnetic record carried by neoformed goethite may be a signature of a frictional heating process in a seismic slip zone.

Original languageEnglish
Pages (from-to)551-554
Number of pages4
JournalGeology
Volume40
Issue number6
DOIs
Publication statusPublished - 2012 Jun 1

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earthquake
goethite
fault zone
fault gouge
magnetic mineral
wall rock
magnetite
drilling
magnetic field
heating
fluid
mineral
rock

ASJC Scopus subject areas

  • Geology

Cite this

Chou, Y. M., Song, S. R., Aubourg, C., Lee, T. Q., Boullier, A. M., Song, Y. F., ... Wang, C. Y. (2012). An earthquake slip zone is a magnetic recorder. Geology, 40(6), 551-554. https://doi.org/10.1130/G32864.1

An earthquake slip zone is a magnetic recorder. / Chou, Yu Min; Song, Sheng Rong; Aubourg, Charles; Lee, Teh Quei; Boullier, Anne Marie; Song, Yen Fang; Yeh, En-Chao; Kuo, Li Wei; Wang, Chien Ying.

In: Geology, Vol. 40, No. 6, 01.06.2012, p. 551-554.

Research output: Contribution to journalArticle

Chou, YM, Song, SR, Aubourg, C, Lee, TQ, Boullier, AM, Song, YF, Yeh, E-C, Kuo, LW & Wang, CY 2012, 'An earthquake slip zone is a magnetic recorder', Geology, vol. 40, no. 6, pp. 551-554. https://doi.org/10.1130/G32864.1
Chou YM, Song SR, Aubourg C, Lee TQ, Boullier AM, Song YF et al. An earthquake slip zone is a magnetic recorder. Geology. 2012 Jun 1;40(6):551-554. https://doi.org/10.1130/G32864.1
Chou, Yu Min ; Song, Sheng Rong ; Aubourg, Charles ; Lee, Teh Quei ; Boullier, Anne Marie ; Song, Yen Fang ; Yeh, En-Chao ; Kuo, Li Wei ; Wang, Chien Ying. / An earthquake slip zone is a magnetic recorder. In: Geology. 2012 ; Vol. 40, No. 6. pp. 551-554.
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