Journal of the Geodetic Society of Japan
Online ISSN : 2185-517X
Print ISSN : 0038-0830
ISSN-L : 0038-0830
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Volume 23, Issue 2
Displaying 1-12 of 12 articles from this issue
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  • Observations of the Earth Tidal Strains at Toyohashi, Central Japan (1st Report)
    Tsuneo YAMAUCHI
    1977 Volume 23 Issue 2 Pages 57-62
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.57
    JOURNAL FREE ACCESS
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    Records of three silicatube extensometers during periods from October 1973 to July 1975, observed at Toyohashi (Mikawa Crustal Movement Observatory), has been analyzed by Fourier analysis in order to detect time variations of earth tidal strains. The observed earth tidal strains of three extensometers show seasonal variations. Dividing the whole data into 30 days segments and analyzed successively, shifting the time window by 20 days, it is found that these seasonal variations of M2 constituents are less than 5% and amplitude changes of M2 constituents larger than 10% will easily be detected if 30 day's data are used in analysis. If we used one year's data, amplitude changes of M2 constituents larger than 3% will easily be detected. Each silicatube extensometer has two or three sensors attached to the same quartz pipe so that it is possible to discuss an irregularity of tidal strains. Ratios of tidal strains of these sensors are different in each tidal constituent and these discrepancies in amplitude and phase lags may be caused by geological conditions in the gallery.
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  • Calibration on Scale Constants of LaCoste & Romberg Gravimeters (Model G)
    Ichiro NAKAGAWA, Mikio SATOMURA, Yoichi FUKUDA, Sinzi NAKAI, Takao SET ...
    1977 Volume 23 Issue 2 Pages 63-73
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.63
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    In gravity measurements, a discrepancy among the scale constants of gravimeters used is one of the most essential, important but inevitable problems, especially when a difference of gravity values among the measuring stations is large. Some experimental investigations so far made have been revealed that an amount of the discrepancy among the scale constants for LaCoste & Romberg gravimeters (model G) was to be about ±2×10-4, -remaining the detail unclear. A calibration on the scale constants of 8 LaCoste & Romberg gravimeters (G-29, G-31, G-118, G-124, G-196, G-210, G-305 and G-447) was accordingly carried out, under a harmonious teamwork of the Institutes concerned, during the period of 15 days from October 26 to November 9, 1976, in order not only to make clear the discrepancy among the scale constants of the gravimeters but also to determine the most jreliable gravity values at the measuring stations. The calibration line was newly established between Hokkaido and Okinawa, referring to the International Gravity Standardization Net 1971 (IGSN 71) and the Japan Gravity Standardization Net 1975 (JGSN 75), and itsmaximum gravity difference was of about 1.6 gals. It is ascertained through the present investigation that the correction factor for the scale constants of the 8 LaCoste & Romberg gravimeters given by the manufacturer is ranged to about (28)×10-4 and that the accuracy of the scale constants is to be about(23)×10-5 after making the correction.
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  • Crustal Movements Associated with the 1933 Sanriku-oki, Japan, Earthquake
    Yoichiro FUJII
    1977 Volume 23 Issue 2 Pages 74-81
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.74
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    Most of abrupt coastal upheaval associated with earthquake are interpreted as result of reverse faulting with low dip angle. The results of levelling suggest a possibility that seismic crustal upheaval along the coast of Sanriku, northeast Japan, were associated with the 1933 Sanriku-oki earthquake with magnitude 8 .3, although the earthquake is normal faulting on the Japan trench. In order to test whether the earthquake could have given coastal upheaval or not, crustal movements are calculated with the following fault parameters for the 1933 Sanriku-oki earthquake;Strike of fault N3°ELength of fault 300 kmWidth of fault 100 kmDip angle 45°Normal slip 6.6 m The results show a 4-6 cm seismic upheaval along the Sanriku coast and horizontal crustal strain with 2-4×10-6 in the east and middle part of northeast Japan . This normal faulting of the 1933 earthquake gave additional crustal strain and would be a trigger of some geophysical phenomena such as earthquake swarms or occurrence of deep earthquakes.
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  • International Connection of Gravity between Japan and South America
    Ichiro NAKAGAWA, Yutaka TANAKA, Mikio SATOMURA, Masaaki KATO, Kazuo OI ...
    1977 Volume 23 Issue 2 Pages 82-87
    Published: September 25, 1977
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.11366/sokuchi1954.23.82
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    An international connection of gravity was carried out by using a couple of LaCoste & Romberg gravimeters, G-29 and G-196, at Kyoto, Tokyo, Oahu-Honolulu, Los Angeles, Mexico City, Lima, Arequipa and Santiago. The gravity difference was of about 2.1 gals. After the data obtained were adjusted, correction factors for the scale constant of the gravimeters G-29 and G-196 given by the manufacturer were determined to be 1.000893 and 1.000526, respectively. The value of the correction factor for the gravimeter G-29 was slightly larger than that of another international gravimetric connection among Tokyo, Moscow, Potsdam and Paris which was performed by the Geographical Survey Institute. Using these correction factors, the gravity value at each measuring station was recalculated under the assumption that the mean value of gravity at all stations registered
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  • On the Characteristics of Water?Tube Tiltmeter (1)
    -Static Characteristics-
    Hiroshi ISHII, Toshiya SATO, Kenji TACHIBANA
    1977 Volume 23 Issue 2 Pages 88-98
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.88
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    Water tube tiltmeters are presently operating for continuous observation of ground tilt in the several crustal movement observatories of Tohoku University. In the present paper, static characteristics of the water tube tiltmeter are investigated theoretically and experimentally. It is shown that the experimental results well coincide with the theoretical results. It is found that the displacement of a float for change of the water level increases with increasing diameter of the float for diameters less than about 10 cm.
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  • On the Characteristics of Water-Tube Tiltmeter (2)
    -Dynamic Characteristics-
    Hiroshi ISHII, Toshiya SATO, Kenji TACHIBANA
    1977 Volume 23 Issue 2 Pages 99-109
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.99
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    Continuous data of the ground tilt have been obtained by water tube tiltmeters in the several crustal movement observatories of Tohoku University. In the former paper, static characteristics of the water tube tiltmeter were investigated in detail. In the present paper, dynamic characteristics of the water tube tiltmeter are investigated theoretically and experimentally. It is shown that theoretical results coincide well with experimental results.
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  • Polar Wobble Excitation Expected from the World Precipitation
    Naokichi KIKUCHI
    1977 Volume 23 Issue 2 Pages 110-118
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.110
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    The effect of precipitation upon the wobble is investigated, replacing the precipitation with a simplified formula between the precipitation and the soil water. The phase delay of nearly one month between the annual components of the polar orbit due to the excitation function of the atmospheric pressure and the IPMS polar orbit is shown to be dissolved if the effect of the soil water is added to the atmospheric excitation function.
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  • Earthquake Research Institute University of Tokyo
    Yukio HAGIWARA
    1977 Volume 23 Issue 2 Pages 119-120
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.119
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    Gravity changes reported to be caused by earthquakes in Japan are listed up. The amount of gravity change has a tendency to decrease exponentially with the time when the change was observed. This may indicate that gravimetric techniques have been gradually improved as years advanced.
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  • A Remark on Possibility of Dilatancy Recovery
    Yoichiro FUJII
    1977 Volume 23 Issue 2 Pages 121-122
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.121
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    Dilatancy-fluid diffusion model for earthquake precursors [1] requires dilatancy recovery [2] in which coseismically upheaved region should subside because of crack closing and diffusion out of water. In both cases of the 1930 earth-quake swarm near Ito and the 1965 earthquake
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  • Magnetic Change Accompanying the Haicheng Earthquake of February 4, 1975
    Naomi FUJITA
    1977 Volume 23 Issue 2 Pages 123-124
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.123
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  • IAU Symposium No. 78 on Nutation and the Earth's Rotation
    Chikara SUGAWA
    1977 Volume 23 Issue 2 Pages 125-127
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.125
    JOURNAL FREE ACCESS
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  • 1977 RCM Symposium, Palo Alto, California (Report)
    Keichi KASAHARA, Takehisa HARADA
    1977 Volume 23 Issue 2 Pages 128-131
    Published: September 25, 1977
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.23.128
    JOURNAL FREE ACCESS
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