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Article type: Photogravure
1984 Volume 29 Issue 2 Pages
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Published: July 01, 1984
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Article type: Photogravure
1984 Volume 29 Issue 2 Pages
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Published: July 01, 1984
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Sachio EHARA
Article type: Article
1984 Volume 29 Issue 2 Pages
75-94
Published: July 01, 1984
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Ten new heat flow values were determined by using geothermal well data and water well data in central Kyushu in addition to one new value in southern Kyushu. As a result, the existence of the high heat flow zone (higher than 2 HFU) became clear. Almost all the volcanoes, hot springs and other geothermal manifestations in central Kyushu exist in this high heat flow zone. Underground temperatures were calculated based on the equation of heat conduction in the steady state. Generally, temperatures amount to 330℃ at 10 km deep, 620℃ at 20 km and 940℃ at 30 km deep. Accordingly there may exist a zone of partial melting of rocks beneath the Moho discontinuity in central Kyushu. In the Kuju area, which is located in the eastern half of central Kyushu, there is a possibility that partial melting occurs at such a shallower depth as 10 to 15 km.
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Naoyuki FUJII
Article type: Article
1984 Volume 29 Issue 2 Pages
95-107
Published: July 01, 1984
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Recent volcanic activity along the Peru-Chile Trench distributes regions of thick crust and of a 30-degree dipping slab. Instead, the flattened slab region corresponds to the non-active volcanic region, i.e. the volcanic gap. Differences of crust and mantle structures seem essential to the present distribution of volcanic activity. The dehydration of subducted oceanic crust and the potential melting in the wedge mantle are in general necessary conditions to generate the andesitic magma. However, the most probable source region of “Andean” andesite in the central Andes is the lower crust below about 50 km, because of temperature structures deduced from crust and mantle structure underlain by subducting slab, and from heat flow values of higher than 90 mW/m
2 in the active volcanic region. The volcanic gap can be explained by the thermal structure due to the subduction of cold flattened slab, that is, temperature distributions could not become high enough to generate andesitic magma in the wedge mantle and the lower crust. It could not be denied the possibility that the partial melting in the lower crust due to the released water would occur without extensive active volcanism.
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Kiyoshi NISHI, Kentaro TAZAWA
Article type: Letter
1984 Volume 29 Issue 2 Pages
109-111
Published: July 01, 1984
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Shigeru SUTO
Article type: Letter
1984 Volume 29 Issue 2 Pages
112-114
Published: July 01, 1984
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Hajime KURASAWA, Fusao ARAI, Hiroshi MACHIDA
Article type: Letter
1984 Volume 29 Issue 2 Pages
115-118
Published: July 01, 1984
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O. Oshima
Article type: Abstract
1984 Volume 29 Issue 2 Pages
119-
Published: July 01, 1984
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S. Aramaki, Y. Hayakawa
Article type: Abstract
1984 Volume 29 Issue 2 Pages
119-
Published: July 01, 1984
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O. Oshima
Article type: Abstract
1984 Volume 29 Issue 2 Pages
119-120
Published: July 01, 1984
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T. Soya, K. Uto, S. Suto
Article type: Abstract
1984 Volume 29 Issue 2 Pages
120-
Published: July 01, 1984
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K. Endo, T. Chiba, N. Miyaji, K. Sakatsume, M. Sumita
Article type: Abstract
1984 Volume 29 Issue 2 Pages
120-121
Published: July 01, 1984
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T. Chiba, N. Miyaji
Article type: Abstract
1984 Volume 29 Issue 2 Pages
121-
Published: July 01, 1984
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N. Miyaji, K. Endo
Article type: Abstract
1984 Volume 29 Issue 2 Pages
121-122
Published: July 01, 1984
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M. Sumita
Article type: Abstract
1984 Volume 29 Issue 2 Pages
122-
Published: July 01, 1984
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K. Ishihara, M. Iguchi, K. Kamo
Article type: Abstract
1984 Volume 29 Issue 2 Pages
122-123
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K. Nakamura
Article type: Abstract
1984 Volume 29 Issue 2 Pages
123-
Published: July 01, 1984
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M. Nagaoka, T. Takeda, Y. Ota
Article type: Abstract
1984 Volume 29 Issue 2 Pages
123-
Published: July 01, 1984
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Y. Tanaka, M. Takahashi, N. Nishide
Article type: Abstract
1984 Volume 29 Issue 2 Pages
123-124
Published: July 01, 1984
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Joint seismic observation group of the Miyake-jima volcano, T. Miyazak ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
124-
Published: July 01, 1984
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T. Chiba, N. Miyaji, S. Noshiro, M. Minaki
Article type: Abstract
1984 Volume 29 Issue 2 Pages
124-125
Published: July 01, 1984
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Y. Momikura, R. Imamura
Article type: Abstract
1984 Volume 29 Issue 2 Pages
125-
Published: July 01, 1984
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S. Suto, K. Sakaguchi, H. Kamata, K. Katoh, T. Yamamoto
Article type: Abstract
1984 Volume 29 Issue 2 Pages
125-126
Published: July 01, 1984
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T. Hamada, O. Oshima, K. Ito
Article type: Abstract
1984 Volume 29 Issue 2 Pages
126-
Published: July 01, 1984
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S. Aramaki, Y. Hayakawa, M. Shirao, M. Koyama, T. Fujii, T. Kobayashi, ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
126-127
Published: July 01, 1984
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M. Tsuchide, S. Kato, H. Sato, N. Konishi
Article type: Abstract
1984 Volume 29 Issue 2 Pages
127-
Published: July 01, 1984
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S. Ichikawa, M. Nagaoka, S. Hatano
Article type: Abstract
1984 Volume 29 Issue 2 Pages
127-
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M. Nagaoka, T. Takeda, Y. Ota
Article type: Abstract
1984 Volume 29 Issue 2 Pages
127-128
Published: July 01, 1984
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M. Sawada
Article type: Abstract
1984 Volume 29 Issue 2 Pages
128-
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S. Ueki, H. Shimizu, J. Koyama, E. Murakami, S. Hori, A. Takagi, K. Ta ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
128-
Published: July 01, 1984
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H. Shimizu, S. Ueki, J. Koyama, S. Hori, E. Murakami, T. Matsuzawa, A. ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
129-
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Y. Sawada, K. Fukui, K. Sato, S. Nihei, A. Fukudome
Article type: Abstract
1984 Volume 29 Issue 2 Pages
129-
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I. Yokoyama
Article type: Abstract
1984 Volume 29 Issue 2 Pages
129-130
Published: July 01, 1984
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M. Tsuchide, H. Sato, N. Konishi
Article type: Abstract
1984 Volume 29 Issue 2 Pages
130-
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S. Suto, K. Sakaguchi, H. Kamata, O. Matsubayashi, K. Katoh, T. Yamamo ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
130-131
Published: July 01, 1984
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T. Kagiyama, T. Watanabe, H. Tsuji, N. Osada, E. Koyama, T. Takeda, K. ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
131-
Published: July 01, 1984
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H. Utada, I. Nakagawa, Y. Sasai, Y. Ishikawa, Y. Hamano
Article type: Abstract
1984 Volume 29 Issue 2 Pages
131-
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I. Nakagawa, Y. Sasai, H. Utada, Y. Ishikawa, S. Koyama, K. Ohchi, T. ...
Article type: Abstract
1984 Volume 29 Issue 2 Pages
131-132
Published: July 01, 1984
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T. Fujii, S. Aramaki, T. Chiba
Article type: Abstract
1984 Volume 29 Issue 2 Pages
132-
Published: July 01, 1984
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K. Okumura, H. Makimoto, S. Suto
Article type: Abstract
1984 Volume 29 Issue 2 Pages
132-133
Published: July 01, 1984
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T. Soya, K. Uto, K. Okumura, S. Suto
Article type: Abstract
1984 Volume 29 Issue 2 Pages
133-
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T. Fukuoka
Article type: Abstract
1984 Volume 29 Issue 2 Pages
133-134
Published: July 01, 1984
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J. Ossaka, J. Hirabayashi, T. Ozawa
Article type: Abstract
1984 Volume 29 Issue 2 Pages
134-
Published: July 01, 1984
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K. Notsu, S. Aramaki
Article type: Abstract
1984 Volume 29 Issue 2 Pages
134-
Published: July 01, 1984
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H. Takahashi, K. Sato, J. Sato
Article type: Abstract
1984 Volume 29 Issue 2 Pages
134-135
Published: July 01, 1984
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K. Chihara, S. Aoki, K. Yagi, S. Shindo
Article type: Abstract
1984 Volume 29 Issue 2 Pages
135-
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S. Aoki, S. Shindo, K. Chihara
Article type: Abstract
1984 Volume 29 Issue 2 Pages
135-136
Published: July 01, 1984
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T. Hamada, K. Watanuki, T. Matsumoto, O. Oshima, H. Ohba, H. Higuchi
Article type: Abstract
1984 Volume 29 Issue 2 Pages
136-
Published: July 01, 1984
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K. Suzuki, M. Tsuzawa
Article type: Abstract
1984 Volume 29 Issue 2 Pages
136-137
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H. Sato
Article type: Abstract
1984 Volume 29 Issue 2 Pages
137-
Published: July 01, 1984
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