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Titolo:
ESR analysis of the Nojima fault gouge, Japan, from the DPRI 500 m borehole
Autore:
Matsumoto, H; Yamanaka, C; Ikeya, M;
Indirizzi:
Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 5600043, Japan Osaka Univ Osaka Japan 5600043 t Earth & Space Sci, Osaka 5600043, Japan
Titolo Testata:
ISLAND ARC
fascicolo: 3-4, volume: 10, anno: 2001,
pagine: 479 - 485
SICI:
1038-4871(200109/12)10:3-4<479:EAOTNF>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUARTZ; MOVEMENTS; SIGNALS;
Keywords:
defect; electron spin resonance dating; fault; frictional heat; quartz;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Matsumoto, H Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, 1-1 Machikaneyama, Osaka5600043, Japan Osaka Univ 1-1 Machikaneyama Osaka Japan 5600043 0043, Japan
Citazione:
H. Matsumoto et al., "ESR analysis of the Nojima fault gouge, Japan, from the DPRI 500 m borehole", ISL ARC, 10(3-4), 2001, pp. 479-485

Abstract

Electron spin resonance (ESR) analyses of quartz grains in fault gouge were performed for a core sample taken from the Nojima Fault that moved duringthe 1995 Kobe earthquake (Hyogo-ken Nanbu earthquake). Distribution of radiation-induced defects in the gouge at a depth of 389.4 m was measured by extracting quartz grains from seven discrete positions within 30 mm of the fault plane on the granite side. The decrease in E'(1) and Al centers was observed within 2 mm of the fault plane, suggesting partial annealing due to faulting. Partial annealing even at that depth suggested that conventional ESR dating, which is based on the hypothesis of complete annealing during faulting, was not applicable. Theoretical calculations of the temperature rise and of the thermal annealing of defects have been made by assuming a simple annealing model of heat generation on the fault plane. Thermal energy was calculated to have been approximately 8 MJ/m(2) to explain the profile of the heat-affected region. Thermal energy was much larger than the one estimated from hydrothermal solution, and corresponded to the frictional heat calculated for a normal stress of 20 MPa, a displacement of 2 m, and a frictional coefficient of 0.2.

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Documento generato il 06/04/20 alle ore 01:58:55