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Titolo:
Seismicity changes related to a water injection experiment in the Nojima Fault Zone
Autore:
Tadokoro, K; Nishigami, K; Ando, M; Hirata, N; Iidaka, T; Hashida, Y; Shimazaki, K; Ohmi, S; Kano, Y; Koizumi, M; Matsuo, S; Wada, H;
Indirizzi:
Kyoto Univ, Disaster Prevent Res Inst, Uji 6110011, Japan Kyoto Univ UjiJapan 6110011 saster Prevent Res Inst, Uji 6110011, Japan Univ Tokyo, Earthquake Res Inst, Tokyo 1130032, Japan Univ Tokyo Tokyo Japan 1130032 Earthquake Res Inst, Tokyo 1130032, Japan
Titolo Testata:
ISLAND ARC
fascicolo: 3-4, volume: 10, anno: 2001,
pagine: 235 - 243
SICI:
1038-4871(200109/12)10:3-4<235:SCRTAW>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-SPECTRAL-ANALYSIS; INDUCED EARTHQUAKES; HYPOCENTERS; GERMANY; STRESS; ROCKS;
Keywords:
1995 Hyogo-ken Nanbu earthquake; coefficient of friction; induced earthquake; Nojima Fault Zone Probe; Nojima Fault; permeability; water injection experiment;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Tadokoro, K Nagoya Univ, Grad Sch Sci, Res Ctr Seismol & Volcanol, Aichi 4648602, Japan Nagoya Univ Aichi Japan 4648602 lcanol, Aichi 4648602, Japan
Citazione:
K. Tadokoro et al., "Seismicity changes related to a water injection experiment in the Nojima Fault Zone", ISL ARC, 10(3-4), 2001, pp. 235-243

Abstract

A water injection experiment was carried out by the scientific drilling program named the 'Nojima Fault Zone Probe' during the two periods 9-13 February and 16-25 March 1997. The pumping pressure at the surface was approximately 4 MPa. The total amount of injected water was 258 m(3). The injection was made between depths of 1480 m and 1670 m in the Disaster Prevention Research Institute, Kyoto University (DPRI) 1800 m borehole drilled into the Nojima Fault zone. A seismic observation network was deployed to monitor seismic activity related to the water injections. Seismicity suddenly increased in the region not far from the injection hole 4 or 5 days after the beginning of each water injection. These earthquakes were likely to be induced by the water injections. Most of the earthquakes had magnitudes ranging from-2 to +1. Numerous earthquakes occurred during the first injection, but only one could be reliably located and it was approximately 2 km north of theinjection site. Between the two injection periods, earthquakes concentrated in the region approximately 1 km northwest of the injection site. During and after the second injection experiment, earthquakes were located approximately 1.5 km west of the injection site. Those earthquakes were located approximately 3 km or 4 km from the injection point and between 2 km and 4 kmin depth. Values of intrinsic permeability of 10(-14)-10(-15) m(2) were estimated from the time lapse of the induced seismic activity. The coefficient of friction in the area where the induced earthquakes occurred was estimated to be less than 0.3.

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Documento generato il 04/04/20 alle ore 21:35:09