巻号一覧
28 巻 (1982)
- 4 号 p. 193-
- 3 号 p. 121-
- 2 号 p. 73-
- 1 号 p. 1-
28 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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福田 洋一, 小菅 正裕, 中井 新二, 里 嘉千茂, 三品 正明1982 年 28 巻 4 号 p. 193-202
発行日: 1983/03/10
公開日: 2011/03/01
ジャーナル フリーGravity survey has been carried out in Seikan tunnel, the world longest undersea tunnel in its completion which links Honshu with Hokkaido by railroad, for the purpose of clarifying gravity features in Tsugaru channel. Gravity values were obtained in the undersea tunnel, therefore, corresponding gravity values at sea surface were calculated in order to obtain free-air and Bouguer anomalies. The comparison between free-air and Bouguer anomalies at sea level indicates thedeiciency of mass which corresponds to the density difference between sea water (ρ=1.03 g/cm3) and rock (ρ=2.67 g/cm3) in Tsugaru channel Another interesting feature is increasing of Bouguer anomalies from center of Tsugaru channel toward Matsumae peninsula. It may be considered from some model investigations that the increasing is caused by lower crustal uplift in Matsumae penin sula. It also suggests a possibility of the relationship between geological structure and crustal structure in the region.抄録全体を表示PDF形式でダウンロード (940K) -
関口 直甫1982 年 28 巻 4 号 p. 203-210
発行日: 1983/03/10
公開日: 2011/07/05
ジャーナル フリー1980年1月から1981年7月に至る地球回転パラメーターの短時間尺度変動を,筆者らが開発した有意な放物線を適合させる方法(SEKIGUCHI and HARA)により解析した.資料はIPMSから提供された光学的時刻・緯度観測を使用した.UT1-TAIの振舞は複雑であり,時々13日程度の周期の震動があらわれた.極位置x,yについては,有意な短時間尺度の変動は少ない.抄録全体を表示PDF形式でダウンロード (735K) -
矢田部 学1982 年 28 巻 4 号 p. 211-219
発行日: 1983/03/10
公開日: 2011/07/05
ジャーナル フリーAstrogeodetic deflections of the vertical in Japan with respect to Bessel′s ellipsoid are mostly directed to the northwest due to the unfitness of Bessel′s ellipsoid to the geoid in and around Japan. This kind of unsuitableness for the position of Bessel′s ellipsoid is based on the assumption that the astrogeodetic deflection is taken as zero at the geodetic datum . A correction computation is desired for best-fitting the ellipsoid to the geoid. Astrogeodetic deflections of the vertical in Japan have been observed at 324 trian gulation points during the period from 1947 to 1977 by the Geographical Survey Insti tute. And the geoidal heights in and around Japan have been computed by the Hydrographic Department of the Maritime Agency. The present study is devoted to transforming the Geodetic Reference System of Japan into an ellipsoid best-fitting the Japan Hydrographic Department Geoid. The result shows that the correction for the deflection of the vertical at the Tokyo geodetic datum amounts to ξ0=-11″.98 and ηo= +10″.24. These values are well consistent with the results previously obtained by the various methods.抄録全体を表示PDF形式でダウンロード (688K) -
―定常的地殻歪について―藤井 陽一郎, 中根 勝見1982 年 28 巻 4 号 p. 220-229
発行日: 1983/03/10
公開日: 2011/07/05
ジャーナル フリーSecular strain field in the Kanto-Tokai district is deduced from the observed crustal strains in various regions and for different periods. Deduced tectonic strain will be contaminated by some unexpected anomalous crustal movement such as post-seismic and preseismic one, even though earth's strains during the period without any large earthquake are taken into consideration. The longest survey intervals are adopted in order to make larger the accumulated strains and smaller the unexpected effects. Line of contraction is defined as a curved line, tangent of which at any point on the line coincides with the principal axis of contraction at that point, and shown in the Fig. 5. This indicates tectonic line of contraction in the Kanto-Tokai district. Frequency distribution of maximum shear strain rates is calculated in order to estimate representative strain rate in the district. When the mode of frequency distribu tion is adopted as the representative value, these are ;4.0×10-7/yr for the Kanto district, 1.6 ×10-7/yr for the Tokai district, and 5.3×10-7/yr for the Izu peninsula.These obtained strain rates are the same order, except for the Tokai district, as the strain rate in the other tectonic area, when the geodetic observations are carried out across or close to the plate boundary. The obtained small strain rate in the Tokai district will be contaminated by the occurrence of the 1944 Tonankai earthquake.抄録全体を表示PDF形式でダウンロード (1033K) -
NATIONAL REPORT TO THE INTERNATIONAL GRAVITY COMMISSION TOKYO, 7-15 MAY 1982THE SECTION OF GEODESY, THE NATIONAL COMMITTEE FOR GEODESY AND GEOPH ...1982 年 28 巻 4 号 p. 231-283_3
発行日: 1983/03/10
公開日: 2011/07/05
ジャーナル フリーThe International Association of Geodesy (IAG) held its General Meeting at the Keidanren-Kaikan (Building of Federation of Economic Organizations) in Tokyo from May 7 to 15, 1982 at the invitation of the Science Council of Japan and the Geodetic Society of Japan. The participants at the General Meeting reached to as many numbers as 360, 170 from Japan and 190 from abroad, followed by 37 accompanying persons; besides the heading number of 171 Japanese participants, 47 from the United States of America, 19 from the Federal Republic of Germany, 10 from France and 10 from Canada. Asian and African countries also sent delegations, figuring 12 participants from the People's Republic of China, 8 from the Republic of Korea, 8 from the Federal Republic of Nigeria and so on. Thus the large Conference Room was filled with the participants and the meeting was fringed with colourful international atmosphere. The opening ceremony, with the honourable attendance of 2 foreign ambassadors, 6 science attaches and some 31 guests, was initiated by opening address of Professor Ietsune TSUBOKAWA, Chairman of the Local Organizing Committee, and by Presidential address of Professor Helmut MORITZ, President of the JAG. During the whole period of the General Meeting, in the lounges at the both sides of the Conference Room, an exhibition of the recent results of geodetic surveys as well as researches of Japan and the NOAA, USA were on display, together with various geodetic measuring instruments.抄録全体を表示PDF形式でダウンロード (1777K)
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