巻号一覧
14 巻 (1961)
- 4 号 p. 205-
- 3 号 p. 131-
- 2 号 p. 63-
- 1 号 p. 1-
前身誌
14 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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岡野 健之助, 加茂 幸介1961 年 14 巻 3 号 p. 131-137
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーDirection of Approach of microseismic waves was investigated in Kyushu by means of vector seismographs. It was found that no microseismic wave comes from the west direction even when typhoons were situated in the south-west direction. The frequency of arrival directions was distributed partially for the direction of the Hyuga Sea where the continental margin is near to the coast.
From these distributions and those at the Abuyama Observatory, it is reasonably concluded that the nearer the continental margin is to the coast, the more frequently microseismic waves are generated.抄録全体を表示PDF形式でダウンロード (1325K) -
田治米 鏡二1961 年 14 巻 3 号 p. 138-149
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーIn the characteristic equation (1·1) of M-waves, two major branches, M (1) and M (2), have been defined by (3·7) or (4·4) which is deduced from (2·1) for the case of a plate. Calculated results are shown in Figs. 5, 6 and 7 by thick full lines for M (1) and by thick dotted lines for M (2).
The next two points must be noticed.
1) No dispersion curves, but for a plate, intersect each other on one c/vp-Tvp/H plane, if they correspond to a certain real structure of media.
2) Any dispersion curve changes from M (1) to M (2) or from M (2) to M (1), when it crosses chain lines which were given by the first equation in (3·5) or (4·8).
No criterion has been found for classification of continuous dispersion curves. In the present stage, the author thinks, notation (5·1) or (5·2) will be better than (5·3) or (5·4).抄録全体を表示PDF形式でダウンロード (1270K) -
第1部 御母衣爆破地震動の観測爆破地震動研究グループ1961 年 14 巻 3 号 p. 150-167
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーSince September 1957, several scores of tons of explosives have been detonated many times, for quarrying purpose connected with construction of a rock-fill dam at the site of Miboro-valley, Gihu Prefecture.
The Research Group for Explosion Seismology has carried out successfully systematic observations of seismic waves from the six quarry blasts, in order to get information about the crustal structure in central Japan, over Kwantô, Tyûbu, Kinki and Tyûgoku Districts. Our temporary observation stations, 75 in total, were spread to a distance of about 300km mainly along the Eastern profile and the Western profiles A and B, as shown in Figs. 4 and 5. Observed data and time-distance graphs of first seismic arrivals are given in this paper.抄録全体を表示PDF形式でダウンロード (2500K) -
第2部 地殼構造について三雲 健, 大塚 道男, 宇津 徳治, 寺島 敦, 岡田 惇1961 年 14 巻 3 号 p. 168-188
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーFrom the observed results of seismic waves from the Miboro Explosions, two probable models of crustal structure as shown in Figs. 5, 8 and 9 were derived for the Eastern and Western profiles, respectively.
The time-distance plot of first seismic arrivals shows the following apparent velocities for the respective branches; in Model I: 5.55, 5.86, 6.33 and 7.91km/sec in the Eastern profile, 5.55, 5.92, 6.32 and 7.52km/sec in the Western profile A, 5.55, 5.81, 6.16 and 7.45km/sec in the Western profile B; in Model II: 5.5, 6.0 and 7.9km/sec in the former profile, 5.5, 6.0 and 7.5km/sec in the latter two profiles.
These data are interpreted to indicate three crustal layers with a compressional velocity of 5.55, 6.00 and 7.70km/sec, taking the results obtained in Kwantô District into consideration.
The first layer is thickest in Tyûbu region and in the northern part of the Lake Biwa. Comparing the results in two Western profiles the layer is considered to taper northwards (toward the Japan-Sea coast). The boundary surface between the 2nd and 3rd layers (probably, the Mohorovicic discontinuity) becomes deeper westwards from Kwantô District with the deepest value of about 38km in the Tyûbu mountain regions, and in turn becomes shallower to 28km at Miboro. This deepens again toward Kinki District with the deepest value of 36km. but seems to be shallower in the Awazi Island.抄録全体を表示PDF形式でダウンロード (2363K) -
南雲 昭三郎1961 年 14 巻 3 号 p. 189-197
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリー2 dimentional elastic wave propagation in a liquid layer overlying a sloping rigid bottom is studied. Mode solutions exst. Elastic wave propagation in the layer is described by superposing the normal modes. The mode solutions take the forms of progressive wave in the range hr>|ξ|>0, namely in the range r (θ1+θ2) / (2n-1) λ/4>1. Normal mode wave has dual dispersive property; phase velocity varies not only with frequency but also with distance. When the interface is inclined apparent phase velocity, which will be observed at a certain station, is expected to be generally different from the formal phase velocity, which is defined in the representation of progressive wave. However, in the special case of sloping rigid bottom, apparent phase velocity becomes equal to the formal phase velocity. Dispersion curve of the formal phase velocity corresponds to that of parrarell interface when r (θ1+θ2) is understood as the depth at the station. Apparent phase velocity increases as the mode wave progresses towards shallower direction, and decreases towards deeper direction. Apparent phase velocity at a certain station however does not depend upon the direction of the wave propagation. Apparent group velocity, which will be observed at a certain station, depends upon the location of the source.抄録全体を表示PDF形式でダウンロード (913K) -
佐藤 泰夫1961 年 14 巻 3 号 p. 198-199
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーPDF形式でダウンロード (292K) -
安芸 敬一1961 年 14 巻 3 号 p. 199-201
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーPDF形式でダウンロード (483K) -
桃井 高夫1961 年 14 巻 3 号 p. 201-202
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーPDF形式でダウンロード (274K) -
桃井 高夫1961 年 14 巻 3 号 p. 203
発行日: 1961/09/25
公開日: 2010/03/09
ジャーナル フリーPDF形式でダウンロード (154K)
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