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, 2 号
選択された号の論文の7件中1～7を表示しています
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田治米 鏡二, 浜田 和郎1961 年 14 巻 2 号 p. 63-76
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーThe transition mentioned in the title has not yet been studied theoretically, though this may be expected to occur physically. Many theoretical investigations are needed in order to elucidate the phenomenon; those on dispersion-curves, amplitudes of displacement for any period, orbits of particle and amplitude distributions in the vertical direction etc.
Here, however, the first alone is dealt with. The feature of transition is somewhat like those of waves in a plate (TAZIME, 1958b) and of waves in a layer overlying an absolutely rigid half space (TAZIME, 1959b). Therefore numerical calculations are executed only for σ1=0.25 and 0.48 where σ, means POISSON's ratio in the superficial layer.
In the present case if υp2/υp1>1, a large number of higher order of Mn modes must be reduced again to odd orders of liquid-liquid waves. Similarly, a large number of higher order of Mn mode must be reduced again to even orders of liquid-liquid waves.
Dispersion curves obtained are shown in Figs. 2 to 7 by thick lines where chain lines indicate (1·2) and dotted lines indicate the second equation of (2·10). Elastic constants used here are tabulated in Table 2. On the dotted line, amplitudes of displacement potential must be zero.抄録全体を表示PDF形式でダウンロード (955K) -
田治米 鏡二1961 年 14 巻 2 号 p. 77-88
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーThree cases are considered as those shown in Fig. 4: incident waves exist in the medium 1 in cases (a) and (b) but in the medium 2 in case (c).
General relations between various coefficients in case (a) and those in case (c) have been found formally in (4·2). One can obtain any coefficient in case (c) directly by (4·2) from that in case (a).
Formal expressions for all coefficients in cases (a) and (c) have been obtained from which programming for electronic calculations will be derived.抄録全体を表示PDF形式でダウンロード (888K) -
附: 月のねじれ振動竹内 均, 小林 直太1961 年 14 巻 2 号 p. 89-93
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーUsing the variational calculus method in a previous paper, we calculate the free periods of the earth's torsional oscillations for the wave numbers up to 11. The calculated periods are in good agreements with those observed in the Chilean earthquake of May, 1960. Assuming that the moon is a homogeneous sphere with shear wave velocity 4.7km/sec, we calculate also the free torsional periods of the moon. The fundamental period thus obtained is about 15min.抄録全体を表示PDF形式でダウンロード (311K) -
池上 良平1961 年 14 巻 2 号 p. 94-101
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーThe relation between the seismic intensity I and the mean annual number N of earthquakes which give that intensity at the seismological stations in Japan were found to be expressed by the formula log N=α-βI. The constants α and β differ from an area to another, and it appears that the value of β for an area is nearly proportional to the value of α for that area. This result bears some resemblance to what has been found by Tsuboi about the mean annual number N of earthquakes having magnitude M. The values of α and β are given in Table 2. The constant m in the Ishimoto-Iida's law of earthquake occurrence was obtained for various areas, and these values are given in Table 3.抄録全体を表示PDF形式でダウンロード (606K) -
西村 英一, 中川 一郎, 細山 謙之輔, 斎藤 正徳, 竹内 均1961 年 14 巻 2 号 p. 102-112
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーGravimeter records of the Chilean earthquake of May 22, 1960 are obtained in Kyoto. These records are read at 2-minutes intervals. About 1500 numerical data thus obtained are high-pass filtered and Fourier analysed. Power spectra thus obtained are shown in Figs. 2-5. The 53.4 and 35.8min. oscillations of the earth seem to be detected by the present analysis. The 53.4min. gravity variation is about 0.57μ gal in amplitude and attains its negative maximum at the origin time of the earthquake, i. e., 19th. 11m., May 22, 1960. The corresponding displacement amplitude is estimated by Figs. 6 and 7 to be 0.28cm.抄録全体を表示PDF形式でダウンロード (2735K) -
青木 治三1961 年 14 巻 2 号 p. 113-118
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーFree oscillations of spherical seismic origins, initiated by an explosive, are calculated on the assumption that the elastic constants in a fractured region are changing proportionally to the square of radial distance from the origin. Results obtained in this study are as follows: The lowest frequency does not always increase with the thickness of the fractured region. The frequency, as shown in Figs. 2 and 3, becomes nearly twice as large as that of a spherical cavity without the fractured region. Variations of damping rations of free oscillations are also shown in Figs. 2 and 3.抄録全体を表示PDF形式でダウンロード (443K) -
安芸 敬一1961 年 14 巻 2 号 p. 119-120
発行日: 1961/06/25
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (263K)
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