巻号一覧
26 巻 (1980)
- 4 号 p. 227-
- 3 号 p. 137-
- 2 号 p. 75-
- 1 号 p. 1-
26 巻, 2 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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藤本 博巳, 友田 好文1980 年 26 巻 2 号 p. 75-81
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーThree important problems exist in constructing a superconducting gravimeter. These are (1) to keep liquid helium as long as possible, (2) to make the sensor mass astatic, and (3) to use a high sensitivity detector to measure small variation of position of the sensor mass. A superconducting gravimeter with a diameter of 15 mm is designed and set up in liquid helium storage tank of 50 liters. This device will be used for gravity measure ment continuously for more than a month. The smallest vertical force gradient of the device which we have used corresponds to a resonant frequency of 2 Hz of the sensor mass. Variation of position of the sensor mass will be detected with the sensitivity of 1 Angström (10-8 cm) by use of a superconducting quantum interference device(SQUID). By use of this device it is expected that gravity variations can be measured with a sensi tivity better than 10-9 G.抄録全体を表示PDF形式でダウンロード (784K) -
福田 洋一, 中川 一郎1980 年 26 巻 2 号 p. 82-90
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーVarious kinds of geodetic data; for examples, levelling, triangular, gravimetric and other data, have recently been stored in relation to researches for earthquake prediction and other purposes. Under these circumstances, to develop a data processing system for efficient utilizations of such geodetic data would be considered one of the most important and urgent problems. On the other hand, a graphic display unit of refreshing-type has recently been showed its capability to the full for handlings of graphically represented data in computer science. Therefore, its application to geodetic data which would be considered suitable for the graphic representation brings many advantages to data processing. A computer program for time-space representation of the geodetic data has been developed by means of a graphic display unit of refreshing-type. The main procedure of the program consists of two steps. One is an interpolation for missing values of the geodetic data in time-space domains, and the other is a graphic display of the interpolated data. The program was applied to gravimetric data obtained around Lake Biwa in order to demonstrate its efficiency. In addition, some problems of this technique are briefly discussed for the future studies.抄録全体を表示PDF形式でダウンロード (2554K) -
柳沢 道夫1980 年 26 巻 2 号 p. 91-103
発行日: 1980/08/30
公開日: 2011/03/01
ジャーナル フリーEarth tides observations have been carried out by multiple set of TEM tiltmeters and a set of V-M horizontal pendulum tiltmeter at the Nokogiriyama Crustal Movement Observatory during the period from November 1967 to August 1975 and from December 1977 to February 1979. The dataprocessing is made by the harmonic analysis method provided by Inter national Center of Earth Tides, and the results are compiled in the tables presented in this paper.抄録全体を表示PDF形式でダウンロード (2459K) -
藤井 陽一郎, 中根 勝見1980 年 26 巻 2 号 p. 104-112
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーThe 1st order triangulation near the Suruga Bay, Honshu, Japan was carried out three times in 1883/1891, 1931, 1973 respectively. The earth's horizontal strains were deduced from these survey data. In the first report [1], net adjustment of the triangulation in 1931 was carried out under the assumption that the positions of the two stations, KENASHIYAMA and DAIMUGENYAMA, are not changed during 1883/1891-1931 . In the second report, geodetic positions of the three stations, TANZAWAYAMA, KENASHIYAMA, and DAIMUGENYAMA in 1931 are deduced from the survey data that are obtained under the assumption of some fixed stations located far from the discussed region. These estimated positions of the three stations are adopted in the net adjustment. Net adjustments of the triangulations in 1883/1891 and 1973 are the same as in the first report. Directions of two principal strain axes and maximum shear strain in each geodetic triangle in the second report are the same as in the first report, while dilatation and side-length changes are different each other. Horizontal displacement vectors of the triangulation stations during 1883/1891-1931 are obtained referring to the fixed stations far from the convergent boundary of the Philippine Sea plate. From these data, it is concluded that the Izu peninsula is drifting to NNW by 2.3 cm/yr and the Tokai district is compressed to NNW by 1.1 cm/yr.抄録全体を表示PDF形式でダウンロード (885K) -
竹本 修三1980 年 26 巻 2 号 p. 113-123
発行日: 1980/08/30
公開日: 2011/03/01
ジャーナル フリーFour extensometers with laser interferometer systems were installed in the disused race tunnel at the Amagase Crustal Movement Observatory. Two of them (EL-1 and EL-V) are super-invar bar extensometers with laser interferometer systems consisting of simple laser sources, Michelson interferometers and photodetecting equipments with image-sensors. The remaining two components (L-1 and L-2) are laser extensometers with a frequency-stabilized laser source. EL-1 and L-1 are orientated along the axis of the tunnel and L-2 is orientated across the tunnel. EL-V is a vertical component. Using continuous data obtained from these extensometers for the period of 390-day, the distortion of tidal strain field due to the cavity effect has been investigated. There is a good agreement between the observed data and the cavity effect calculated with finite element techniques for the actual tunnel profile.抄録全体を表示PDF形式でダウンロード (1052K) -
Harold SOLOMON1980 年 26 巻 2 号 p. 124-125
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (282K) -
植田 義夫1980 年 26 巻 2 号 p. 126-127
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (223K) -
木股 文昭, 山内 常生, 田中 寅夫, 細 善信1980 年 26 巻 2 号 p. 128-129
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーSide-by-side distance measurements by two Geodimeters were made in order to investigate the origin of fluctuations in measured lengths with a period from a few tens of minutes to one hour. The light paths and distances for the instruments were set to be close to each other, and the measurement was carried out within a few hours before and after sunset for four consecutive days. A weak correlation was found in slow fluctuations with a period of one to four hours in the two lengths observed with the two Geodimeters; the is considered to be due to the change of light velocity along the path. On the other hand, there can hardly be seen any certain relationship in the fluctuations with short periods (10-20 minutes), so that they are presumably caused by the instrumental error. It is also suggested that an accuracy higher than ±1.0X10-6 will be obtainable in the distance measure ments with Geodimeter 6BL by repeating measurements many times within a few hours around sunset.抄録全体を表示PDF形式でダウンロード (259K) -
木股 文昭, 藤井 巌, 中村 勝1980 年 26 巻 2 号 p. 130-131
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーA small aperture (20-65 m) bench mark array for spirit-level survey has been installed on Yake-Dake Volcano in October 1977. The levelling net which is located 0.5 km from the main active fumarole, consists of three loops, with a total length of 529 m. Spirit level surveys have been annually conducted in Oct. 1977, Sept. 1978 and Oct. 1979. Loop closures afford a precision of about 0.5√mm (D; loop length, km). Tilt vector from 1977 to 1979 shows a dip of about 10μradians/year towards NNW which means a relative upheaval of the sumit of Yake- Dake.抄録全体を表示PDF形式でダウンロード (1425K) -
萩原 幸男1980 年 26 巻 2 号 p. 132-133
発行日: 1980/08/30
公開日: 2010/09/07
ジャーナル フリーMost of active faults are located in negative short-wavelength Bouguer anomaly zones in Northeast Japan. Exceptionally in the shallowfocus seismic belt around the tip of Philippine Sea Plate boundary, active faults coincide with a positive short-wavelength Bouguer anomaly zone.抄録全体を表示PDF形式でダウンロード (283K)
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