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Article type: Photogravure
1986 Volume 31 Issue 4 Pages
App6-
Published: December 26, 1986
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Kozo YUHARA, Jun IRIYAMA
Article type: Article
1986 Volume 31 Issue 4 Pages
241-252
Published: December 26, 1986
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The thermal structures of the Nakanoyu geothermal area, Nagano and its vicinity are considered quantitatively. The Nakanoyu area is located in the south-eastern foot of an active volcano, Mt. Yakedake. In order to improve traffic in the Abo mountain pass which is closed for six months by heavy snow in winter and sometimes is closed by rockfalls and landslides, the Ministry of Construction has planned to construct a long tunnel there. As the route is near the summit dome of the Yakedake volcano, the temperatures within the tunnel may become extremely high. We, therefore, have to research the detailed 3-D subsurface temperature distribution of the Nakanoyu area and its vicinity. Numerical simulations were carried out to calculate the 3-D subsurface temperature distribution from the 1 m-depth ground temperatures and the measured temperatures within deep boreholes as boundary conditions. The computed results indicate that the subsurface temperatures are quite high in the region near the Nakanoyu hot spa, which becomes about 160℃ in the maximum at 1330 m altitude. With the increase in altitude, the computed subsurface temperature becomes low in general. These calculation results are quite consistent with the measured values within the new gallery which was drived after our theoretical research.
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Toshihiro NAKAMURA, Masaru BANJU, Jun SATO, Haruo TAKAHASHI
Article type: Article
1986 Volume 31 Issue 4 Pages
253-264
Published: December 26, 1986
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Chemical analysis for major and minor elements were performed on the pumice and scoria samples from the 17 fall units of the 1707 fallout tephra of Fuji volcano. Analytical results showed that there exsisted three magmas different in chemical composition, implying that a layered magma reservoir with downward increasing basicity may have been formed prior to the eruption or a magma mixing might occur during the eruptive activity. The trude density of the pyroclastics also varied along with the variation of the chemical composition. The crystalline phases in ejecta were observed to be more abundant in the later ejecta than in the earlier. The variation in porosity of the ejecta observed along the stratigraphic column togather with the content of lithic fragments in the respective fall unit may discriminate the pyroclastics ejected from the two earlier formed craters from the ejecta from the later formed crater.
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Yo UESUGI, Kunihiko KIGOSHI
Article type: Letter
1986 Volume 31 Issue 4 Pages
265-268
Published: December 26, 1986
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T. Ikeda, Y. Katsui
Article type: Abstract
1986 Volume 31 Issue 4 Pages
269-
Published: December 26, 1986
Released on J-STAGE: February 13, 2018
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H. Ohshima, M. Yahata, N. Wada
Article type: Abstract
1986 Volume 31 Issue 4 Pages
269-
Published: December 26, 1986
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I. Yokoyama, N. Matsushima
Article type: Abstract
1986 Volume 31 Issue 4 Pages
269-270
Published: December 26, 1986
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F. Akita, Y. Murayama, H. Ohshima
Article type: Abstract
1986 Volume 31 Issue 4 Pages
270-
Published: December 26, 1986
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Y. Nishimura
Article type: Abstract
1986 Volume 31 Issue 4 Pages
270-271
Published: December 26, 1986
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H. Miyamachi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
271-
Published: December 26, 1986
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R. Ballestracci, Y. Nishida
Article type: Abstract
1986 Volume 31 Issue 4 Pages
271-
Published: December 26, 1986
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Y. Nishida
Article type: Abstract
1986 Volume 31 Issue 4 Pages
271-272
Published: December 26, 1986
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H. Miyakawa
Article type: Abstract
1986 Volume 31 Issue 4 Pages
272-
Published: December 26, 1986
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K. Yamagata, H. Machida, F. Arai
Article type: Abstract
1986 Volume 31 Issue 4 Pages
272-273
Published: December 26, 1986
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S. Okamura
Article type: Abstract
1986 Volume 31 Issue 4 Pages
273-
Published: December 26, 1986
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T. Suzuki, Y. Katsui, K. Kamada
Article type: Abstract
1986 Volume 31 Issue 4 Pages
273-
Published: December 26, 1986
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H. Mori
Article type: Abstract
1986 Volume 31 Issue 4 Pages
273-274
Published: December 26, 1986
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T. Yamazaki
Article type: Abstract
1986 Volume 31 Issue 4 Pages
274-
Published: December 26, 1986
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K. Niida, J. Kamito, S. Takahashi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
274-275
Published: December 26, 1986
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Y. Ikeda, Y. Katsui, H. Kurasawa
Article type: Abstract
1986 Volume 31 Issue 4 Pages
275-
Published: December 26, 1986
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H. Yamagishi, S. Miyasaka, S. Koitabashi, S. Kawachi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
275-276
Published: December 26, 1986
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H. Miyamachi, H. Mori, T. Maekawa, A. Suzuki, H. Okada, I. Yokoyama
Article type: Abstract
1986 Volume 31 Issue 4 Pages
276-
Published: December 26, 1986
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Y. Matsushima, Y. Nishimura, A. Suzuki, H. Okada
Article type: Abstract
1986 Volume 31 Issue 4 Pages
276-
Published: December 26, 1986
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S. Togashi, T. Tanaka, H. Kurasawa, T. Yoshida, K. Ishikawa, A. Fujina ...
Article type: Abstract
1986 Volume 31 Issue 4 Pages
276-277
Published: December 26, 1986
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T. Kagiyama, S. Koyama, H. Utada
Article type: Abstract
1986 Volume 31 Issue 4 Pages
277-
Published: December 26, 1986
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H. Sato
Article type: Abstract
1986 Volume 31 Issue 4 Pages
277-278
Published: December 26, 1986
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M. Kusakabe, J. Hirabayashi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
278-
Published: December 26, 1986
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I. Yokoyama, S. De la Cruz Reyna
Article type: Abstract
1986 Volume 31 Issue 4 Pages
278-279
Published: December 26, 1986
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I. Kaneoka, Y. Takigami, K. Notsu, H. Sakai, K. Fujioka
Article type: Abstract
1986 Volume 31 Issue 4 Pages
279-
Published: December 26, 1986
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S. Kato, K. Nakamura, M. Ando, H. Iwabuchi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
279-280
Published: December 26, 1986
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”Shinkai 2000” Research Group on the Okinawa Trough
Article type: Abstract
1986 Volume 31 Issue 4 Pages
280-
Published: December 26, 1986
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N. Fujibayashi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
280-281
Published: December 26, 1986
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K. Uto, G. Mora Alvarez, H. Hirai, S. Arai, K. Goto
Article type: Abstract
1986 Volume 31 Issue 4 Pages
281-
Published: December 26, 1986
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H. Iwamori
Article type: Abstract
1986 Volume 31 Issue 4 Pages
281-282
Published: December 26, 1986
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N. Asaoka
Article type: Abstract
1986 Volume 31 Issue 4 Pages
282-
Published: December 26, 1986
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N. Miyaji
Article type: Abstract
1986 Volume 31 Issue 4 Pages
282-283
Published: December 26, 1986
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S. Nakano
Article type: Abstract
1986 Volume 31 Issue 4 Pages
283-
Published: December 26, 1986
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K. Oikawa, N. Miyaji
Article type: Abstract
1986 Volume 31 Issue 4 Pages
283-
Published: December 26, 1986
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S. Aramaki
Article type: Abstract
1986 Volume 31 Issue 4 Pages
284-
Published: December 26, 1986
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J. Sato, T. Nakamura, H. Takahashi, S. Aramaki
Article type: Abstract
1986 Volume 31 Issue 4 Pages
284-
Published: December 26, 1986
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M. Churei
Article type: Abstract
1986 Volume 31 Issue 4 Pages
284-285
Published: December 26, 1986
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M. Sawada, N. Gyoda, E. Koyama, H. Tsuji
Article type: Abstract
1986 Volume 31 Issue 4 Pages
285-
Published: December 26, 1986
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S. Noguchi
Article type: Abstract
1986 Volume 31 Issue 4 Pages
285-286
Published: December 26, 1986
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L. Siebert, H. Glicken, T. Ui
Article type: Abstract
1986 Volume 31 Issue 4 Pages
286-
Published: December 26, 1986
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K. Kamo, K. Ishihara
Article type: Abstract
1986 Volume 31 Issue 4 Pages
286-
Published: December 26, 1986
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T. Ui, R. Matsusue
Article type: Abstract
1986 Volume 31 Issue 4 Pages
287-
Published: December 26, 1986
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Y. Sasai
Article type: Abstract
1986 Volume 31 Issue 4 Pages
287-
Published: December 26, 1986
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Y. Hayakawa
Article type: Abstract
1986 Volume 31 Issue 4 Pages
287-288
Published: December 26, 1986
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K. Yamashina
Article type: Abstract
1986 Volume 31 Issue 4 Pages
288-
Published: December 26, 1986
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O. Oshima
Article type: Abstract
1986 Volume 31 Issue 4 Pages
288-
Published: December 26, 1986
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