巻号一覧
22 巻 (1969 - 1970)
- 4 号 p. 261-
- 3 号 p. 171-
- 2 号 p. 83-
- 1 号 p. 1-
前身誌
22 巻, 2 号
選択された号の論文の11件中1～11を表示しています
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1965年弟子屈付近の地震吉井 敏尅1969 年 22 巻 2 号 p. 83-93
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーSurface waves of short periods were finely found on the records of three Teshikaga earthquakes in 1965. The observation point was Kushiro in Hokkaido and the seismometer used was Type 59 of J. M. A.. The magnitudes of these earthquakes were about 5 and the epicentral distances were between 50 and 60km. The EW-component of the seismometer recorded Love waves and the NS- and the vertical components recorded Rayleigh waves, because the direction propagated by these surface waves was nearly north to south. Three modes, M11, M12 and Love were identified on the records and group velocities of them were obtained from these records. Only three models of the crustal structure are given in the present paper, though much more models were examined numerically. One of the successful models, HOK-5 B, has the sedimentary layer whose thickness is 2.25km.抄録全体を表示PDF形式でダウンロード (853K) -
本山 満雄1969 年 22 巻 2 号 p. 94-103
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーExperiments were carried out with two dimensional models which had various slope angles. Period of wave groups were changed from 10μs to 40μs. Three wave groups were distinctly observed. However, propagations of these wave groups were so complicated that dispersion curves could not be decided from the records observed.
Using the theoretical dispersion curves for dispersive Rayleigh waves in case of parallel layers, group velocities at any distance from the vertex of the sloping layer were obtained. Then, theoretical travel times were calculated for each wave group. The travel time of the most distinct wave group observed corresponds well to the theoretical time-distance curve of M11. The other wave group may correspond to PL21 near the vertex and to M21 far from the vertex. Another is only refracted S waves, being P waves scarcely observed.抄録全体を表示PDF形式でダウンロード (991K) -
1968年十勝沖地震および1963年エトロフ島沖の地震長宗 留男1969 年 22 巻 2 号 p. 104-114
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーOn the strong motion seismograms at stations in Hokkaido and northern Honshu for the Tokachi-Oki Earthquake of May 16, 1968, remarkable waves with large amplitude are recorded at about 20-50 seconds after the S phases. The origin time and the hypocentral coordinates of this earthquake are given by JMA as follows; 00h48m53.0s (GMT), 40°44′N, 143°35′E, H=0km.
By mean of the travel time analysis, it is found that these waves can be explained as the S wave radiated at the other place from the hypocenter of the main shock. The time and coordinates of the wave origin estimated by the application of Geiger's method are as follows; 00h49m38.3s±1.3s(GMT), 40°35′±00′N, 142°20′±00′E, H=0km.
From the strong motion seismogram obtained at Urakawa, Hokkaido, for the Etorofu-Oki Earthquake of Oct. 13, 1963, it is also suggested that the large energy was released at the other place from the origin of the main shock, even though such unique solutions for the time and the coordinates of the origin can not be estimated as above example.抄録全体を表示PDF形式でダウンロード (942K) -
浦部 達夫1969 年 22 巻 2 号 p. 115-120
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーDaily variation in the temperature of the cytherean atmosphere is discussed, based upon the radiation equilibrium condition. A coupling of two systems of day side and night side is the main interest.
According to the rotation of the planet, energy influx from the sun varies sinusoidally with time. However, variations in the radiation equilibrium temperature are not always sinusoidal, and a discontinuous jump at 350°K and 250°K is expected.
Wind of hot gas from the day side to the night side occurs continuously, and a temperature rise of 30°K is realized at the night side.抄録全体を表示PDF形式でダウンロード (428K) -
島津 康男, 河野 芳輝1969 年 22 巻 2 号 p. 121-130
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーSurface heat flow is observed fairly well at the Japanese Islands area. It is our purpose to utilize the observed heat flow to estimate the thermal condition of the mantle.
Two-dimensional heat transfer equation of composite media is solved numerically. The equation is composed of several terms: conductive transport, convective transport, radiogenic heat generation, and metamorphic heat absorption. The boundary conditions are as follows; surface temperature is always equal to zero, and the heat flow at the bottom of the region is kept constant at 0.4×10-6cal/cm2·sec. Crustal structure of the Japanese Islands area is referred from the recent seismological works. The region is devided into square grids. The medium number and the convective vector are specified by two digits for each grid point. Two digits forms a two-dimensional matrix, i. e. Medium Map. Therefore, the Medium Map represents both the crustal structure and the convective current pattern. The convective current is assumed to be stationary where both the current pattern and the velocity are presumed a priori.
Several thermal model of the Japanese Islands are discussed and it is concluded that the observed heat flow pattern is explained by the following model: upward mantle convection or large magma reservoir exists under the Japan Sea and no mantle convection or low temperature mantle convection exists under the Pacific Ocean side of the Japanese Islands.抄録全体を表示PDF形式でダウンロード (880K) -
岡野 健之助1969 年 22 巻 2 号 p. 131-135
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーThe magnitude-frequency relation of micro-earthquakes occurring in the vicinity of Kyoto is extraporated to higher magnitudes to obtain the time interval at which one earthquake with arbitrary magnitude or greater is to be expected. The time interval thus obtained is comparable to the recurrence time of destructive earthquakes in the historical records.抄録全体を表示PDF形式でダウンロード (422K) -
南雲 昭三郎1969 年 22 巻 2 号 p. 136-143
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーIt is shown that Ishimoto-Iida's formula, n(a)da=ka-mda, for the frequency distribution of earthquakes with respect to the maximum amplitude of earthquake motion at a certain observation station is derived from a deformation-fracture relation.
The number of earthquakes is assumed, as a deformation-fructure relation, to be proportional to the curvature of the plastic deformation of the medium. The frequency distribution of earthquakes with respect to the amplitude of earthquake motion, n(a)da, is assumed to be proportional to the distribution of the earthquakes with respect to the wave number k of the plastic deformation, n(k)dk.
Assuming further that the amplitude of earthquake motion is inversely proportional to the wave number of plastic deformation, which is a kind of the radiation relation, n(k)dk is transformed to n(a)da. Thus, n(a)da is derived from the plastic deformation of the medium.
The power function representation of n(a)da=ka-mda of Ishimoto-Iida's formula is due to the power function representation for the spectrum of plastic deformation of the medium. The coefficient m indicates the sharpness of the spectrum of the deformation.
It is discussed that Ishimoto-Iida's formula is not a probability distribution of earthquake occurrence, but a causual physical law between the plastic deformation and the number of earthquakes.抄録全体を表示PDF形式でダウンロード (797K) -
岡田 義光1969 年 22 巻 2 号 p. 144-145
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (1542K) -
森谷 武男1969 年 22 巻 2 号 p. 146-147
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (247K) -
4. エゼキエル書－マラキ書尾崎 郁子, 佐藤 泰夫1969 年 22 巻 2 号 p. 148-150
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (280K) -
竹内 均1969 年 22 巻 2 号 p. 150-151
発行日: 1969/08/30
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (176K)
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