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Yoshihiko MIZUTANI, Takemasa HAMASUNA
Article type: Article
1972 Volume 17 Issue 3 Pages
123-134
Published: December 01, 1972
Released on J-STAGE: January 15, 2018
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The geothermal brines (Surface temp. =100℃) discharged from drillholes (52~250m in depth) at Shimogamo, Shizuoka, Japan, have been analyzed for stable isotopes of hydrogen, oxygen, and sulphur, together with chemical analyses. The chemical and isotopic evidences indicate that the geothermal brines are the mixture of local superficial water and the deep geothermal brine supplied by a single source. The estimated chemical and isotopic composition of the deep geothermal brine are interpreted by a mechanism, in which sea water penetrates into the deep geothermal brine reservoir and changes into Na-Ca-Cl brine through hydrothermal reactions with surrounding rocks. The underground temperature of the deep geothermal brine has been estimated as 221°~335℃ from the oxygen isotopic fractionation between sulphate ion and water in the brine.
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Tsuneo ETO, Fumio OHYA
Article type: Article
1972 Volume 17 Issue 3 Pages
135-143
Published: December 01, 1972
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The horizontal deformations of the earth’s crust at two volcanic areas in Kyusyu, Japan have been observed with repeated measurements of the base-line lengths by means of a Geodimeter AGA Model 6 since 1968 and their results for the last three years are reported. In the Sakura-jima area, the network consisted of five base-lines was constructed on the western flank of the volcano Sakura-jima. Each base-line changes its length monotonously for the last three years and principal strain are deduced to be 4∿5×10
-6/year (NNE-SSW) and 0~-1×10
-6/year (ESE-WNW). This results are similar to the manner of horizontal deformations of the earth's crust in the vicinity of Sakura-jima at the great Sakura-jima eruption in 1914 which was found by the triangulations after the eruption (F. Omori, 1920). On the other hand, just after the 1968 Ebino-Yoshimatsu earthquake swarm, a base-line network was established at Yoshimatsu area, western part of Kakuto caldera, where a part of epicentral region is involved. Each base-line changes its length irregularly for the last three years. Taking errors into consideration, we cannot drew any definite conclusions at present for the horizontal deformations in this area, but it seems that there is some correspondence between direction of axes of principal strains and the distributions of initial motion of P wave of Ebino-Yoshimatsu earthquakes (pull~contraction : push~extension).
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Sadato UEKI, Ziro SUZUKI
Article type: Article
1972 Volume 17 Issue 3 Pages
145-153
Published: December 01, 1972
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Mt. Kurikoma is an active volcano located nearly at the center of the northeastern part of Honshu, Japan. The activity of this volcano has been very low in the last decade, and we have few geophysical data about this volcano. The seismic observation was carried out at Mt. Kurikoma in August and September, 1971 in order to know the seismic activity of this volcano and surrounding area in the quiet period. The hypocenters of sixteen earthquakes observed with a tripartite network were determined under a reasonable assumption of crustal structure. Besides these events, thirty epicenters were estimated from P~S times at Mt. Kurikoma and at several observatories of Tohoku University. Some seismic activity beneath and near Mt. Kurikoma was found separately from the aftershocks of an earthquake, which occurred in the southeastern part of Akita Prefecture on October 16, 1970. The activity has a tendency of successive occurrence. The daily number of events is 0.7 on an average except for the period of group occurrence. The seismic activity, even including the aftershocks, is limited within the region under the central mountain range.
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J. Ossaka, H. Ogura, M. Akao, R. Morimoto
Article type: Abstract
1972 Volume 17 Issue 3 Pages
155-
Published: December 01, 1972
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T. Ozawa, J. Hirabayashi, T. Tomita, J. Ossaka
Article type: Abstract
1972 Volume 17 Issue 3 Pages
155-156
Published: December 01, 1972
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Y. Tanaka, S. Kashiwabara, T. Ishizawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
156-
Published: December 01, 1972
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M. Okuno, H. Kurasawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
156-
Published: December 01, 1972
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O. Oshima
Article type: Abstract
1972 Volume 17 Issue 3 Pages
156-157
Published: December 01, 1972
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O. Oshima
Article type: Abstract
1972 Volume 17 Issue 3 Pages
157-
Published: December 01, 1972
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A. Aoyagi
Article type: Abstract
1972 Volume 17 Issue 3 Pages
157-158
Published: December 01, 1972
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Z. Suzuki, S. Ueki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
158-
Published: December 01, 1972
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I. Iwasaki, Y. Yoshiike, S. Yoshida, T. Ozawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
158-
Published: December 01, 1972
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H. Kurasawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
158-159
Published: December 01, 1972
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M. Mishina, A. Takagi, T. Kono
Article type: Abstract
1972 Volume 17 Issue 3 Pages
159-
Published: December 01, 1972
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Seismological Division J. M. A.
Article type: Abstract
1972 Volume 17 Issue 3 Pages
159-160
Published: December 01, 1972
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S. Ehara
Article type: Abstract
1972 Volume 17 Issue 3 Pages
160-
Published: December 01, 1972
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I. Yokoyama
Article type: Abstract
1972 Volume 17 Issue 3 Pages
160-
Published: December 01, 1972
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T. Suzuki, Y. Katsui, T. Nakamura
Article type: Abstract
1972 Volume 17 Issue 3 Pages
160-161
Published: December 01, 1972
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T. Suzuki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
161-
Published: December 01, 1972
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K. Chihara
Article type: Abstract
1972 Volume 17 Issue 3 Pages
161-
Published: December 01, 1972
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S. Ehara
Article type: Abstract
1972 Volume 17 Issue 3 Pages
161-162
Published: December 01, 1972
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T. Tiba
Article type: Abstract
1972 Volume 17 Issue 3 Pages
162-
Published: December 01, 1972
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A. Kubotera
Article type: Abstract
1972 Volume 17 Issue 3 Pages
162-163
Published: December 01, 1972
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Group for seismic exploration in south Kyushu
Article type: Abstract
1972 Volume 17 Issue 3 Pages
163-
Published: December 01, 1972
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I. Yokoyama
Article type: Abstract
1972 Volume 17 Issue 3 Pages
163-
Published: December 01, 1972
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M. Kamata
Article type: Abstract
1972 Volume 17 Issue 3 Pages
163-164
Published: December 01, 1972
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M. Matsumoto, S. Tanaka
Article type: Abstract
1972 Volume 17 Issue 3 Pages
164-
Published: December 01, 1972
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H. Matsumoto
Article type: Abstract
1972 Volume 17 Issue 3 Pages
164-
Published: December 01, 1972
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K. Yagi
Article type: Abstract
1972 Volume 17 Issue 3 Pages
164-
Published: December 01, 1972
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N. Ueno, T. Ui, S. Aramaki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
165-
Published: December 01, 1972
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T. Ui
Article type: Abstract
1972 Volume 17 Issue 3 Pages
165-
Published: December 01, 1972
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N. Isshiki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
165-166
Published: December 01, 1972
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Micheal F. Sheridan
Article type: Abstract
1972 Volume 17 Issue 3 Pages
166-
Published: December 01, 1972
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K. Kudo, M. Ozima
Article type: Abstract
1972 Volume 17 Issue 3 Pages
166-
Published: December 01, 1972
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S. Aramaki, K. Hirayama, T. Nozawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
167-
Published: December 01, 1972
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K. Kitayama, T. Katsura
Article type: Abstract
1972 Volume 17 Issue 3 Pages
167-
Published: December 01, 1972
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Y. Oki, T. Hirano, T. Suzuki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
167-168
Published: December 01, 1972
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Y. Oki, T. Hirano, T. Suzuki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
168-
Published: December 01, 1972
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T. Murase
Article type: Abstract
1972 Volume 17 Issue 3 Pages
168-
Published: December 01, 1972
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H. Taniguchi
Article type: Abstract
1972 Volume 17 Issue 3 Pages
168-169
Published: December 01, 1972
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Y. Sawada
Article type: Abstract
1972 Volume 17 Issue 3 Pages
169-
Published: December 01, 1972
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Y. Sawada
Article type: Abstract
1972 Volume 17 Issue 3 Pages
169-170
Published: December 01, 1972
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M. Hayakawa
Article type: Abstract
1972 Volume 17 Issue 3 Pages
170-
Published: December 01, 1972
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J. Iriyama, M. Minowa, K. Shiraki
Article type: Abstract
1972 Volume 17 Issue 3 Pages
170-
Published: December 01, 1972
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