气候变化领域集成服务门户(CCPortal): The Magnetic Fabric of Gouge Mimics the Coseismic Focal Mechanism of the Chi-Chi Earthquake (1999; Mw 7.6)

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DOI	10.1029/2020GL090111
	The Magnetic Fabric of Gouge Mimics the Coseismic Focal Mechanism of the Chi-Chi Earthquake (1999; Mw 7.6)
	Chou Y.-M.; Aubourg C.; Yeh E.-C.; Song S.-R.; Lin Y.-K.; Humbert F.; Jiang X.; Lee T.-Q.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	We present a magnetic fabric investigation of small oriented rock fragments from gouges and wall rocks from the Chelungpu fault (Taiwan), where the Chi-Chi earthquake occurred (Mw 7.6, 1999). Samples are obtained from surface outcrops and at a depth of ~1 km, including the 3-mm-thick Chi-Chi principal slip zone. Wall rocks at depth show magnetic foliation roughly parallel to bedding, whereas they are oblique at the surface. Within the gouges, the mean shape of magnetic ellipsoid is oblate, and the degree of anisotropy is up to 12%. The magnetic foliation diverges of ~40° from the fault plane, compatible with a simple shear westward. The magnetic lineation is oblique, resulting probably from coseismic and interseismic records. The reconstructed focal mechanism from the magnetic fabric closely matches the focal mechanism solutions for the Chi-Chi earthquake. Our work demonstrates that magnetic fabric of gouge fragments can bring valuable kinematic information on modern earthquakes. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Faulting; Magnetism; Structural geology; ChiChi earthquake; Degree of anisotropy; Focal mechanism; Kinematic information; Magnetic fabrics; Magnetic foliation; Magnetic lineations; Rock fragments; Earthquakes; Chi-Chi earthquake 1999; coseismic process; focal mechanism; foliation; kinematics; lineation; magnetic fabric; magnetic field; slip rate; Chichi; Taiwan
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169377
作者单位	Shenzhen Key Laboratory of Marine Archaea Geo-Omics, Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, TOTAL, LFCR, Pau, France; Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan; Department of Geosciences, National Taiwan University, Taipei, Taiwan; Baseload Power Taiwan Inc., Taipei, Taiwan; Institute of Earth Science, Academia Sinica, Taipei, Taiwan
推荐引用方式 GB/T 7714	Chou Y.-M.,Aubourg C.,Yeh E.-C.,et al. The Magnetic Fabric of Gouge Mimics the Coseismic Focal Mechanism of the Chi-Chi Earthquake (1999; Mw 7.6)[J],2020,47(22).
APA	Chou Y.-M..,Aubourg C..,Yeh E.-C..,Song S.-R..,Lin Y.-K..,...&Lee T.-Q..(2020).The Magnetic Fabric of Gouge Mimics the Coseismic Focal Mechanism of the Chi-Chi Earthquake (1999; Mw 7.6).Geophysical Research Letters,47(22).
MLA	Chou Y.-M.,et al."The Magnetic Fabric of Gouge Mimics the Coseismic Focal Mechanism of the Chi-Chi Earthquake (1999; Mw 7.6)".Geophysical Research Letters 47.22(2020).