巻号一覧
19 巻 (1973)
- 4 号 p. 179-
- 3 号 p. 125-
- 2 号 p. 67-
- 1 号 p. 1-
19 巻, 4 号
選択された号の論文の10件中1～10を表示しています
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(日本およびその近傍の地震について)長沢 工1973 年 19 巻 4 号 p. 179-189
発行日: 1974/03/25
公開日: 2011/07/05
ジャーナル フリーIt is often said that the occurrence of earthquake is affected by the moon or the sun. Various researches have been made on this problem, their relation however remains doubtful. In this paper, statistical correlations between the earthquake frequency and positions of moon and the sun are treated by using 8176 earthquakes in and near Japan. The author considers nine variables about the position of the moon or the sun, namely hour angles, azimuths and zenith distances of the moon and the sun at the epicenter, moreover, distance, time derivative of distance and phase of the moon . These values are precisely computed for the occurrence time of earthquakes and the correlations to earthquakes are investigated. Characteristic results thus obtained are as follows . 1) About the relation to the phase of the moon. During the time around the first and the last quarters of the moon, earth quake frequency increased distinctly about 15% above on average level, which is far beyond the limit of statistical fluctuation. For earthquakes of magnitude over 6, the increase reaches to 30% or more. 2) About the relation to the hour angle of the moon . Earthquake frequency changes systematically according to the hour angle of the moon for earthquakes of magnitude over 6 . Its maximum occurs near the time of moon's hour angle 90° and 300°.……………… From these results descrived above, the author suspects that the moon has influence on the occurrence of earthquake if it is difficult to connect directly the tidal force of the moon with the occurrence of earthquake.抄録全体を表示PDF形式でダウンロード (1400K) -
中根 勝見1973 年 19 巻 4 号 p. 190-199
発行日: 1974/03/25
公開日: 2011/07/05
ジャーナル フリーAnalyses of crustal movements made by using the first order trianguration survey data have already been reported [1] [2] [3]. The purpose of this paper is to estimate the stationary tectonic strain field in Japan by Frank's method [4]. The first order trianguration net in Japan had been established during the period from 1882 to 1909 and was resurveyed from 1948 to 1967. The third survey covered the areas of Kyusyu, Shikoku, Chugoku and Kinki districts in the last five years. The error of an angle for the first order triangulation is approximately ±0″.7 (Table I). The error may produce spurious shear strain of 0.6×105. It should be, however, emphasized that shear strain in Japan during the recent 60 years are approximately 1.0×10-5. These facts indicate that shear strains calculated by survey data are accurate for usage. For the sake of increasing the accuracy, the survey data in which triangle closure and axis error are larger than ±2″ and ±15° respectively are eliminated. Frequency distribution of maximum shear strain velocity shows that the velocities less than 3×10-7/yr. are 84% and the velocities larger than 3×10-7/yr. are only 16% (Table III). The 65% of the velocities larger than 3×10-7/yr. are intimately associated with great earthquakes (Fig.6). If distribution of strain axes would depend only on survey error, they would be randum in direction. However, the axes with the range of the velocities 1.0-2.0×10-7/yr. have uniform direction for each regions (Fig.5). There fore, we must consider that the calculated strains would be produced by crustal movements rather than survey errors.抄録全体を表示PDF形式でダウンロード (1698K) -
中根 勝見1973 年 19 巻 4 号 p. 200-208
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーIn order to obtain the stationary tectonic strain, abrupt and large movements influenced by earthquakes are eliminated. The summary of the strain is as follows: horizontal maximum shear strain velocities in Japan are less than 3×10-7/yr. Minimum principal axes show ESE-WNW in Hokkaido, E-W in Tohoku, ES-WN in south Kanto, E-W in Chubu, ES-WN in Shikoku and E-W in Kyushu. The final result is shown in Fig. 20.抄録全体を表示PDF形式でダウンロード (826K) -
萩原 幸男1973 年 19 巻 4 号 p. 209-212
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーThe hazard rate, the number of fracture occurrence per unit time, is determined not only by laboratory experiments of rock fracture but also by statistical distribution of geodetically obtained ultimate strain of the earth's crust. The probability of earth quake occurrence can be synthetically estimated to some extent by using geodetically observed crustal strain in combination with results of rock fracture experiments.抄録全体を表示PDF形式でダウンロード (399K) -
―長周期成分の分離と長周期地殻変動に関する若干の考察―志知 龍一1973 年 19 巻 4 号 p. 213-224
発行日: 1974/03/25
公開日: 2011/07/05
ジャーナル フリーRecently, some important characteristics of the long period crustal deformation such as migration of crustal strain and a peculiar mode of crustal deformation before and after some remarkable earthquakes have been clarified. In order to elucidate the nature of long period crustal deformation, and to develop further investigations, it is necessary to improve a digital filter technique for the separation of long period crustal strain. An effective method applicable even to any data of comparatively short duration is proposed to a sharp cut-off filter for the changes shorter than one year. With this method it is possible to discuss crustal deformation by strain (tilt) rate and to find out some distinctive movements hidden behind annual change of relatively large amplitude. Applying this method to several continuous records of crustal strain, some remarkable facts have been found. A common feature of tilt movement is revealed at the Inuyama and Kamitakara stations, which might be related to the earthquake process occurred in the central part of Gifu Prefecture on 9th September 1969. However, a similar phenomenon in tilt movement is also seen at the Hirashiba station, Nagano Prefecture. A systematic phase lag is perceived in the movement at these three stations. When we turn a point of view to this fact, it leads us to have the concept that migration of crustal movement may occur not only in some restricted region but also in a relatively wide area.抄録全体を表示PDF形式でダウンロード (1389K) -
柳沢 道夫1973 年 19 巻 4 号 p. 225-232
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーThe purpose of this paper is to clarify the annual variation of temperature in the tunnel at Nokogiriyama observatory. Measurements of temperature in the tunnel and of air temperature at Nokogiriyama observatory were carried out by using thermistor thermometers during the period from March 1971 to March 1973. The data of observation was analysed by method of least squares. The theoretical distribution of temperature in the rock was calculated under the assumption that the whole heat is conducted into rock from the ground surface. As a result, a wide difference between observed and theoretical values was detected. The cause of such a wide difference is believed that the great part of the heat is transported by convection of the air in the tunnel.抄録全体を表示PDF形式でダウンロード (1777K) -
斎藤 正徳1973 年 19 巻 4 号 p. 233-235
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーA simple computational scheme is proposed to solve the equations of the type
φ=θ+Σn bnsin nθ
which appear quite often in geodesy and as tronomy. It consists of a pair of recursive for mulas relating two auxiliary coefficients, which are immediately combined to give the coefficients of the inverse Fourier expansion
θ=φ+Σn=1 ansin nφ抄録全体を表示PDF形式でダウンロード (257K) -
力武 常次1973 年 19 巻 4 号 p. 236-240
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (3464K) -
須川 力1973 年 19 巻 4 号 p. 241-243
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (428K) -
1973 年 19 巻 4 号 p. 244
発行日: 1974/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (120K)
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