測地学会誌

松代周辺における重力変化

田島広一, 井筒屋貞勝

1974 年 20 巻 4 号 p. 153-168
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.153

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Gravity change measurements may be one of the easier ways of detecting tectonic changes induced by an earthquake. In this paper, the gravity data measured during and after the Matsushiro Earthquake Swarm are compiled, and the relationship between gravity and elevation changes is discussed. It is concluded that the elevation of the epicentral area lifts up without any change in subsurface apparent density but sinks with a density increase. We have recently observed density decrease there again, but a possible cause of the decrease remains still unknown.

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TEM傾斜計と赤金における傾斜観測

柳沢道夫

1974 年 20 巻 4 号 p. 169-177
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.169

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In the TEM tiltmeter [1] [2] [3], variation of tilt is mechanically amplified with a cross suspended pendulum whose deflection is transformed to electric signal through a differential transformer. In this instrument, a small effect due to variation of the geomagnetic field still; remained in spite of magnetic shield of the transformer. This was eliminated by using a case of steel of high permeability. Small inclination of the mounting table is given by a micrometer screw incorporated with a lever and two parallel plate spring system as a reduction mechanism. In the oldtype instrument, the turn values of the micrometer head were calculated from the dimensions of the reduction mechanism. It is found, however, that these calculated values are somewhat different from the experimental values measured with a precise dial-gauge (several per cent). It is ascertained that the drift rate may become smaller than 1×10^-6(0"2) per year. The author also analysed the both data obtained with VM and TEM tiltmeters installed in the Akagane Station (Mizusawa) by the method of least squares.

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地球潮汐変化の分類と分布

小沢泉夫

1974 年 20 巻 4 号 p. 178-187
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.178

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Components of earth tides can be classified into three types. The first type is expressed by a product of a constant term F₁(h, k, l) which consists of the tidal numbers h, k, 1 and does not contain functions of latitude and the potential W₂ of the tide generating force. The second type is expressed by a product of a constant term F₂(h, 1) which consists of the tidal numbers h, l and does not contains a function of latitude, and the potential W₂ of the tide generating force. The third type is expressed by a product of a constant term F₃(h, l, θ) which consists of a combination of products of the tidal numbers h, 1, and a function of co-latitude, θ, and the potential W₂ of the tide generating force. Patterns of the latitudinal and the azimuthal distributions of these types' components are calculated. Then, a possibility to obtain the ratio h/l is shown from the patterns of the latitudinal and the azimuthal distributions of the tidal extension which belongs to the third type.

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1974年伊豆半島沖地震に伴なう伊豆半島南端の地殻の上下変動

井筒屋貞勝, 田島広一, 萩原幸男, 村田一郎

1974 年 20 巻 4 号 p. 188-192
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.188

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A locally destructive earthquake occurred on the coast of Izu peninsula (λ=138°48', p=34°34', M=6.9) on May 9th, 1974. The route of bench marks around the epicentral area had been established and surveyed at the level of the third order (closing error 47 mm) by Minami-Izu Town Office in June, 1973. In order to evaluate the coseismic land-deformation, the writers have carried out the resurvey of the first order levelling along the route of bench marks from Shimogamo (B.M. No. 9364) to Iruma Village, in September, 1974. The total length of the route amounts to about 28 km. Comparing the levelling with relevelling results, the relative vertical displacement of bench marks during 14 months are listed in Table I, where B.M. No. 9634 is assumed to be fixed. According to the analysis by means of the "sine-method", we find the coseismic land-tilting having the maximum inclination of 2" to 3" in the direction parallel to the Irozaki Fault which moved actively with a right rateral slip. The vertical displacement previously expected from the fault motion has not been explicitly detected.

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小笠原諸島(父島)の磁気・重力測量

田中穣, 細野武庸, 久保木忠夫, 大和田真一, 立川徹

1974 年 20 巻 4 号 p. 193-208
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.193

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Geomagnetic and gravity surveys in the Bonin island (Chichijima), located in the central part of Izu-Bonin island arc were carried out by the Geographical Survey Institute in December 1973 and March 1974, respectively. The recent first geomagnetic and gravity surveys in this island have been done by the members of the Kakioka Magnetic Observatory since January 1971 and the Geographical Survey Institute from January to February in 1971. From these two surveys, the following results are obtained, (1) Geomagnetic secular change of declination at the first order geomagnetic point of Mt. Shigureyama (No. 98) shows the consistent tendency of west increasing in parallel with the extension line of the secular change of declination obtained by the repetition surveys of Hydrographic Department followed after Tanakadate's results at Ogiura. (2) Free air anomaly shows the value of +360 mgal near the central part of the island. Bouguer anomaly shows the value of +340 mgal in the central and the northern parts of the island. This value may be the most maximum one in the island arcs. (3) Geomagnetic anomalies both total (F) and vertical (Z) intensities show the patterns of the distribution due to a underground dipole though these patterns show the inverse correlation in comparison with the intensities of geomagnetic and Bouguer anomalies. These results are compared with the survey results of Oshima (7) island and discussed about the island arc.

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ワルフェルダンジュ地球力学観測所におけるTEM傾斜計とVM傾斜計による比較観測結果

坪川家恒, 柳沢道夫, 須川力, 細山謙之輔, Paul MELCHIOR, Bernard DUCARME, Jean FLICK ...

1974 年 20 巻 4 号 p. 209-220
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.209

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　ワルフェルダンジュ地球力学観測所に1972年5月から6月にかけて地震研究所の柳沢道夫がTEM傾斜計2台を据付けて,その後もVM振子との同時比較観測が継続された.この比較結果を解析してみたところ,全体的によく一致しているが,時にTEMの方が異常を示すことがあった.海洋潮汐の影響やその他の間接的要因についても詳しく調査した.

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自記水管傾斜計と標準型水管傾斜計の併用方式

若杉忠雄, 笠原慶一

1974 年 20 巻 4 号 p. 221-224
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.221

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潮位の経年変化から求めた長周期海象効果

西修二郎, 田中穣

1974 年 20 巻 4 号 p. 225-226
発行日: 1975/03/25
公開日: 2011/07/05

DOIhttps://doi.org/10.11366/sokuchi1954.20.225

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電磁波測距シンポジウム報告

須田教明

1974 年 20 巻 4 号 p. 227-230
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.227

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第5回近世地殻変動シンポジウム報告

藤田尚美

1974 年 20 巻 4 号 p. 231-232
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.231

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国際コロキウム“地球力学についての基準座標系” 報告

古在由秀

1974 年 20 巻 4 号 p. 233-235
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.233

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第7回　国際重力委員会報告

須川力

1974 年 20 巻 4 号 p. 236-237
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.236

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Report on the Gravimetry in Japan for the Period from July, 1970 do June, 1974

Presented to the 7th Meeting of the International Gravity Commission

1974 年 20 巻 4 号 p. 238-241
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.238

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新刊紹介

1974 年 20 巻 4 号 p. 242
発行日: 1975/03/25
公開日: 2011/03/01

DOIhttps://doi.org/10.11366/sokuchi1954.20.242

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