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Titolo:
Distribution of fault rocks in the fracture zone of the Nojima Fault at a depth of 1140 m: Observations from the Hirabayashi NIED drill core
Autore:
Kobayashi, K; Hirano, S; Arai, T; Ikeda, R; Omura, K; Sano, H; Sawaguchi, T; Tanaka, H; Tomita, T; Tomida, N; Matsuda, T; Yamazaki, A;
Indirizzi:
Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan Niigata UnivNiigata Japan 9502181 Sci & Technol, Niigata 9502181, Japan Japan Marine Sci & Technol Ctr, Frontier Res Program Subduct Dynam, Yokosuka, Kanagawa 2370061, Japan Japan Marine Sci & Technol Ctr Yokosuka Kanagawa Japan 2370061 061, Japan Shinshu Univ, Grad Sch Sci & Technol, Matsumoto, Nagano 3908621, Japan Shinshu Univ Matsumoto Nagano Japan 3908621 sumoto, Nagano 3908621, Japan Natl Res Inst Earth Sci & Disaster Prevent, Tsukuba, Ibaraki 3050006, Japan Natl Res Inst Earth Sci & Disaster Prevent Tsukuba Ibaraki Japan 3050006 Univ Tokyo, Grad Sch Sci, Tokyo 1130032, Japan Univ Tokyo Tokyo Japan 1130032 Tokyo, Grad Sch Sci, Tokyo 1130032, Japan Waseda Univ, Sch Educ, Dept Earth Sci, Tokyo 1698050, Japan Waseda Univ Tokyo Japan 1698050 uc, Dept Earth Sci, Tokyo 1698050, Japan Ehime Univ, Fac Sci, Dept Geobiospher Sci, Matsuyama, Ehime 7908577, JapanEhime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan Univ Tsukuba, Grad Sch Sci & Engn, Tsukuba, Ibaraki 3058572, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058572 sukuba, Ibaraki 3058572, Japan
Titolo Testata:
ISLAND ARC
fascicolo: 3-4, volume: 10, anno: 2001,
pagine: 411 - 421
SICI:
1038-4871(200109/12)10:3-4<411:DOFRIT>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEFORMATION; CATACLASITE; EARTHQUAKE; JAPAN;
Keywords:
1995 Hyogo-ken Nanbu earthquake; clay microstructure; core; drilling; fault gouge; fault rocks; freeze-drying method; Nojima Fault;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Kobayashi, K Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan Niigata Univ Niigata Japan 9502181 , Niigata 9502181, Japan
Citazione:
K. Kobayashi et al., "Distribution of fault rocks in the fracture zone of the Nojima Fault at a depth of 1140 m: Observations from the Hirabayashi NIED drill core", ISL ARC, 10(3-4), 2001, pp. 411-421

Abstract

Characteristics of deformation and alteration of the 1140 m deep fracture zone of the Nojima Fault are described based on mesoscopic (to the naked eye) and microscopic (by both optical and scanning electron microscopes) observations of the Hirabayashi National Research Institute for Earth Science and Disaster Prevention (NIED) drill core. Three types of fault rocks; that is, fault breccia, fault gouge and cataclasite, appear in the central part of the fault zone and two types of weakly deformed and/or altered rocks; that is, weakly deformed and altered granodiorite and altered granodiorite, are located in the outside of the central part of the fault zone (damaged zone). Cataclasite appears occasionally in the damaged zone. Six distinct, thin foliated fault gouge zones, which dip to the south-east, appear clearly in the very central part of the fracture zone. Slickenlines plunging to thenorth-east are observed on the surface of the newest gouge. Based on the observations of XZ thin sections, these slickenlines and the newest gouge have the same kinematics as the 1995 Hyogo-ken Nanbu earthquake (Kobe earthquake), which was dextral-reverse slip. Scanning electron microscopy observations of the freeze-dried fault gouge show that a large amount of void spaceis maintained locally, which might play an important role as a path for fluid migration and the existence of either heterogeneity of pore fluid pressure or strain localization.

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Documento generato il 11/07/20 alle ore 11:24:50