An earthquake slip zone is a magnetic recorder

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題名:	An earthquake slip zone is a magnetic recorder
作者:	郭力維;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
貢獻者:	地球科學學院地球科學學系
關鍵詞:	Asia;Cenozoic;Chi-chi earthquake 1999;Chinshui Formation;cores;Deformation;dipole moment;displacements;Earth Sciences;Earthquakes;Environmental Sciences;Far East;fault zones;Faults;Ferromagnetism;friction;Geology;Global Changes;goethite;gouge;Holocene;identification;magnetic field;Magnetic fields;magnetic minerals;magnetite;magnetization;Minerals;natural remanent magnetization;oxides;paleomagnetism;Quaternary;Quaternary geology;Recorders;remanent magnetization;Rock;Sciences of the Universe;Seismic phenomena;Seismology;Signatures;Slip;Taiwan;Tectonics;thermoremanent magnetization
日期:	2012-06-01
上傳時間:	2026-04-23 11:28:20 (UTC+8)
出版者:	Geological Society of America;Boulder: Geological Society of America (GSA)
摘要:	摘要： 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 inter-seismic 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. 出版者： Boulder: Geological Society of America (GSA) 出版日期： 2012-06-01 出處： Geology, 2012-06, Vol.40 (6), p.551-554 資源來源： GeoScienceWorld Journals 版權： GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld Alexandria, VA USA United States. Reference includes data supplied by the Geological Society of America Boulder, CO USA United States 版權： Copyright Geological Society of America Jun 2012 版權： CC0 1.0 - Universal 識別號： ISSN: 0091-7613 識別號： EISSN: 1943-2682 識別號： DOI: 10.1130/G32864.1
顯示於類別:	[地球科學學系] 期刊論文

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