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Tatsuhiko WADA, Hiroyasu ONO
Article type: Article
1963 Volume 8 Issue 1 Pages
1-10
Published: June 30, 1963
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Sassa classified the volcanic micro-tremors of the Volcano Aso into four kinds. The tremor of the 1st kind is expected to be originated near or at the 1st crater, but its properties of propagation are not completely determined. By analyzing the records obtained through tripartite system into Fourier components and taking the correlation between every pair of them, the properties of propagation are examined. It is resulted that the volcanic micro-tremors of the 1st kind originate near the boundary between the 1st and 2nd crater and travels with the phase velocity of about 1,200m/sec at 1-2cps.
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Keizo YOSHIKAWA, Tatsuhiko WADA, Kosuke KAMO, Hiroyasu ONO
Article type: Article
1963 Volume 8 Issue 1 Pages
11-19
Published: June 30, 1963
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The observation of volcanic earthquakes with three components of seismographs and a small tripartite net was carried out in August, 1962 at Sakura-jima Volcano. The volcanic earthquakes observed were closely related to the activity of the volcano. Examining the wave-orbits and analyzing the apparent velocities and the directions of approach of waves, we obtained the results as follows: (1) The nature of origin of the observed earthquake is an explosive one, since the clear S-phase which is to be found in tectonic seismic-waves could not be observed. (2) The origins of the earthquakes are located beneath the summit crater (Minami-dake). (3) The approaching directions of P-waves disagree with those of surface waves. It is due to the inclination of the tripartite-net plane to the horizontal and it is possible to estimate the depth of origin from the difference between the both directions under the knowledge of the crustal structure of Sakura-jima Volcano. (4) Neverthless the lack of SH-motion, the surface waves of Love-type are found similarly to the case of the underground nuclear explosion. (5) The effect of the feature of ground near the observing site on surface wave-orbit is clearly seen i.e. the polarized plane of Love-type wave trends along the ground surface. (6) The predominant period of seismic waves at Sakura-jima Volcano is in 0.3〜0.4sec. range. The apparent velocity of P-wave is ca. 1.9km/sec. and 0.8km/sec. for the phase velocity of surface wave (Rayleigh-type).
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Yoshinobu MOTOYA, Mitsuo NOGOSHI
Article type: Article
1963 Volume 8 Issue 1 Pages
20-32
Published: June 30, 1963
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In this report a geyser and fumarole are considered as a model of volcanoes, and the tremors observed at the Onikobe geyser and the Ofuki, one of the fumaroles at Volcano Me-Akan, are discussed with special relation to the volcanic tremors. Moreover, tremors observed there are compared with the volcanic tremors which were accompanied by the 1962 eruption of Volcano Tokachi. The results of consideration are as follows: 1) Tremors at the fumarole Ofuki are identified with ones at the Onikobe gayser when water is erupting and both wave frequencies are higher than 10c/s. Tremors of this kind may be also observed near a crater even if the volcanic activity is calm. 2) When a volcano becomes active, tremors having wave frequency lower than 10c/s appear and they seem to be related with some motions of magma in reservoir. 3) The frequency distribution of wave periods of volcanic tremors which appear intermittently during the eruption is similar to that of B-type volcanic earthquakes. Very small B-type earthquakes may not be distinguished from volcanic tremors, especially at distant places from the crater. 4) The more distant from the crater they are observed at, the longer become the wave periods of volcanic tremors: One of the reasons is that waves of shorter period would attenuate more rapidly than those of longer period. But the phenomena may be also due to the generation of surface waves with longer periods during the propagation of volcanic tremors.
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Takeshi MINAKAMI, Shiro HIRAGA, Tsutomu MIYAZAKI, Kikuko ITO, Noriya G ...
Article type: Article
1963 Volume 8 Issue 1 Pages
33-41
Published: June 30, 1963
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Volcano Miyake-sima erupted on August 24, 1962, after a long repose of 22 years. The recent eruption was almost similar with the 1940 activity with respect to the magnitude of eruption, the mode of eruption and the locality of the newly opened craters. The 1962 eruption was followed by severe and numerous earthquakes. The 8000 persons on the Miyake-sima island became extremely uneasy, because they feared if another new crater might be opened. Fortunately, any other crater was not opened. Soon after the eruption took place, the writers made the seismometric observation by setting the acceleration seismograph of vertical and horizontal components at five stations at the margin of the island. Beside these ordinary seismographs a pair of vertical and horizontal transducers of the telerecording system was set at the central part of the island. From the result of the observation, we made clear the localities of hypocenters and the mode of the geographical distribution of the initial motion of earthquakes.
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T. Ozawa
Article type: Abstract
1963 Volume 8 Issue 1 Pages
42-
Published: June 30, 1963
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J. Ossaka
Article type: Abstract
1963 Volume 8 Issue 1 Pages
42-43
Published: June 30, 1963
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M. Kamada
Article type: Abstract
1963 Volume 8 Issue 1 Pages
43-
Published: June 30, 1963
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M. Kamada, Y. Hidaka, M. Fukushima
Article type: Abstract
1963 Volume 8 Issue 1 Pages
43-
Published: June 30, 1963
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S. Taneda
Article type: Abstract
1963 Volume 8 Issue 1 Pages
43-44
Published: June 30, 1963
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K. Yoshikawa, T. Wada, K. Kamo, H. Ono
Article type: Abstract
1963 Volume 8 Issue 1 Pages
44-
Published: June 30, 1963
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K. Yoshikawa, K. Nishi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
44-45
Published: June 30, 1963
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T. Eto
Article type: Abstract
1963 Volume 8 Issue 1 Pages
45-
Published: June 30, 1963
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K. Yamaguchi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
45-
Published: June 30, 1963
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S. Aramaki
Article type: Abstract
1963 Volume 8 Issue 1 Pages
45-46
Published: June 30, 1963
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K. Ono
Article type: Abstract
1963 Volume 8 Issue 1 Pages
46-
Published: June 30, 1963
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S. Taneda
Article type: Abstract
1963 Volume 8 Issue 1 Pages
46-
Published: June 30, 1963
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T. Wada, K. Kamo, T. Hoka
Article type: Abstract
1963 Volume 8 Issue 1 Pages
46-47
Published: June 30, 1963
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K. Takahashi, H. Kurasawa, T. Saito, K. Matsui
Article type: Abstract
1963 Volume 8 Issue 1 Pages
47-
Published: June 30, 1963
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H. Kurasawa, K. Matsui
Article type: Abstract
1963 Volume 8 Issue 1 Pages
47-
Published: June 30, 1963
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H. Takeshita
Article type: Abstract
1963 Volume 8 Issue 1 Pages
48-
Published: June 30, 1963
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N. Isshiki, H. Kurasawa, A. Ozawa, N. Yamada, M. Murayama
Article type: Abstract
1963 Volume 8 Issue 1 Pages
48-
Published: June 30, 1963
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M. Uchimizu
Article type: Abstract
1963 Volume 8 Issue 1 Pages
48-
Published: June 30, 1963
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T. Minakami, K. Ito
Article type: Abstract
1963 Volume 8 Issue 1 Pages
48-49
Published: June 30, 1963
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N. Isshiki, M. Hayakawa, K. Hirasawa, K. Nakamura, Y. Arai, T. Yukutak ...
Article type: Abstract
1963 Volume 8 Issue 1 Pages
49-
Published: June 30, 1963
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Y. Tanaka, M. Shimamura
Article type: Abstract
1963 Volume 8 Issue 1 Pages
49-50
Published: June 30, 1963
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K. Noguchi, S. Ueno, H. Kamiya, T. Nishiido
Article type: Abstract
1963 Volume 8 Issue 1 Pages
50-
Published: June 30, 1963
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T. Yukutake, M. Sawada, T. Yabu, S. Ueda, K. Horai
Article type: Abstract
1963 Volume 8 Issue 1 Pages
50-
Published: June 30, 1963
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Y. Koshikawa, H. Kameyama
Article type: Abstract
1963 Volume 8 Issue 1 Pages
50-
Published: June 30, 1963
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A. Ozawa, H. Kurasawa
Article type: Abstract
1963 Volume 8 Issue 1 Pages
51-
Published: June 30, 1963
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K. Sawamura
Article type: Abstract
1963 Volume 8 Issue 1 Pages
51-
Published: June 30, 1963
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Y. Suzuki
Article type: Abstract
1963 Volume 8 Issue 1 Pages
51-52
Published: June 30, 1963
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I. Yokoyama, M. Aota
Article type: Abstract
1963 Volume 8 Issue 1 Pages
52-
Published: June 30, 1963
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T. Takahashi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
52-
Published: June 30, 1963
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Y. Mototani
Article type: Abstract
1963 Volume 8 Issue 1 Pages
52-53
Published: June 30, 1963
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K. Yagi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
53-
Published: June 30, 1963
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M. Yoshida, T. Ozawa, T. Katsura
Article type: Abstract
1963 Volume 8 Issue 1 Pages
53-
Published: June 30, 1963
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T. Katsura
Article type: Abstract
1963 Volume 8 Issue 1 Pages
53-54
Published: June 30, 1963
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S. Aramaki
Article type: Abstract
1963 Volume 8 Issue 1 Pages
54-
Published: June 30, 1963
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K. Yamamoto
Article type: Abstract
1963 Volume 8 Issue 1 Pages
54-
Published: June 30, 1963
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Y. Katsui, Y. Kondo
Article type: Abstract
1963 Volume 8 Issue 1 Pages
54-55
Published: June 30, 1963
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S. Banno
Article type: Abstract
1963 Volume 8 Issue 1 Pages
55-
Published: June 30, 1963
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T. Katsura, A. Muan
Article type: Abstract
1963 Volume 8 Issue 1 Pages
55-
Published: June 30, 1963
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D. Shimozuru
Article type: Abstract
1963 Volume 8 Issue 1 Pages
55-56
Published: June 30, 1963
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T. Murase
Article type: Abstract
1963 Volume 8 Issue 1 Pages
56-
Published: June 30, 1963
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K. Mogi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
56-57
Published: June 30, 1963
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M. Kumazawa, K. Iida, H. Furuhashi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
57-
Published: June 30, 1963
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H. Kuno
Article type: Abstract
1963 Volume 8 Issue 1 Pages
57-
Published: June 30, 1963
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S. Uyeda, R. P. Herzen
Article type: Abstract
1963 Volume 8 Issue 1 Pages
57-
Published: June 30, 1963
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K. Horai, S. Uyeda
Article type: Abstract
1963 Volume 8 Issue 1 Pages
57-58
Published: June 30, 1963
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H. Kuno, T. Sato, Y. Tsuneishi
Article type: Abstract
1963 Volume 8 Issue 1 Pages
58-
Published: June 30, 1963
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