草津白根山における地磁気全磁力・自然電位観測
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- けいしょう さどひら
- 9 years ago
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1 Observation of Geomagnetic Total Force and Self-potential at Kusatsu-Shirane Volcano T.Koike 1 I.Suganuma 2 T.Uesugi 1 I.Fujii 1 H.Takahashi 1 K.Ikeda 3 N.Kumasaka 1 T.Ookawa 1 T.Oowada 1 T.Tokumoto 1 1:Kakioka Magnetic Observatory JMA 2:Seismological and Volcanological Department JMA 3:Kanoya Magnetic Observatory JMA GPS 1989; Fujita et al., 1995; Ohba et al., 2000; 2001 Johnston, 1997 Sasai et al., 2002
2 Utada et al., 2000; 1996 Hashimoto et al., 1995 Hase et al., 2003 Rapid Fluid Disruption (Johnston et al., 2001) Ohchi et al., mV (1) (2) (3) (1) 1976 (2) (3)
3 No No.18 G m km ( No ) ( No ) 1996 No No No.4 No.4 P No nt No T P Q R 3 1 P 1 Q R Q R Q 1997 R P Q R
4 2 Q R 1km P Q R 2 Q R
5 3 (Y) T No.7 11
6 (a) (b) (a) [Am 2 ] (b) m [Am 2 ] (a) 1992 (a) m [Am 2 ] Q R 3 Q R nT 3 Q R Utada et al.( 2000) R Q 5 Q R
![8 10 7 [Am 2 ] (a) 1992 (a) 1989 9 1991 9 900m 5.](/docs-images/49/20189998/images/page_6.jpg "3 10 7 [Am 2 ] 3 3 2 2 2004 5 1999 10 2003 11 Q R 3 Q 2000 8 2003 7 R")
7 R R (Y) 7 Q R 2
8 Q R 7 5 T Q R Q R Q R 7 Q R (a) (b) ( 4 ) (a) (b) ) Q R R Q 3 Q R Q R Utada et al Q R SPB
9 A C SPB A B C SPB C A Line1 Line2 Line m 1m 3 3 SPB A B D E cm 50m m 500m 3 500m SPB B 1 2 GPS 10m
10 V 99% 7.3mV 7.3mV (a)spb A B C SPB (b)c A SPB SPB SPB SPB -78mV SPB -78mV C A SPB SPB C A 9 mv m 10 (a) 10mV 40 50mV SPB 10 (b) 1994 a-b 10 (c) 1994 A C mV SPB 1994 A B
11 10 SPB A B D E 11 SPB SPB B 0 44 B E SPB B mV/m B 100mV 46 60(+300mV) 70 84(+220mV) (+360mV) (+140mV) (-180mV) (-230mV) mV mV 11 SPB E
12 SPB B 12 50m 100m mV SPB 12-53mV mV/m 13 20mV mV
13 3.3 (1) (2) mV/m H Ishido and Mizutani, 1981 H 1.1 D E H H Ohba et al. (2000) H H 10 m 100 m m mV -230mV 500m +300mV +220mV 600m +360mV m m
14 (1) (2) (3) R (4) 1994 (5) Fujita, E., Y. Ida, and J. Oikawa (1995) Eigen oscillation of a fluid sphere and source mechanism of harmonic volcanic tremor. J. Volcanol. Geotherm. Res., 69, Hase, H., T. Ishido, S. Takakura, K. Sato, and Y. Tanaka (2003) z-potential measurement of volcanic rocks from Aso caldera. Geophys. Res. Lett., 30, 2210, doi: /2003gl Hashimoto, T., and Y. Tanaka (1995) A large self-potential anomaly on Unzen volcano, Shimabara peninsula, Kyushu island, Japan. Geophys. Res. Lett., 22, Johnston, M. J. S. (1997) Review of electric and magnetic fields accompanying seismic and volcanic activity. Surv. Geophys., 18, Johnston, M. J. S., J.D. Byerlee, and D. Lockner (2001) Rapid fluid disruption: A source for self-potential anomalies on volcanoes. J. Geophys. Res., 106, Djedi S. Widarto CSMT TDEM
15 Ohba, T., J. Hirabayashi, and K. Nogami (2000) D/H and 18 O/ 16 O ratios of water in the crater lake at Kusatsu-Shirane volcano, Japan. J. Volcanol. Geotherm. Res., 97, Ohchi, K. (1987) Observation of the geomagnetic total force at Kusatsu-Shirane Volcano. Mem. Kakioka Mag. Obs., 22, Sasai, Y., M. Uyeshima, J. Zlotnicki, H. Utada, T. Kagiyama, T. Hashimoto, Y. Takahashi (2002) Magnetic and electric field observations during the 2000 activity of Miyake-jima volcano, Central Japan. Earth Plant. Sci. Lett., 203, Utada, H., M. Neki, and T. Kagiyama (2000) A study of annual variations in the geomagnetic total intensity with special attention to detecting volcanomagnetic signals. Earth Planets Space, 52,
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