巻号一覧
7 巻 (1962)
- 4 号 p. 103-
- 2-3 号 p. 39-
- 1 号 p. 1-
7 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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小沢 泉夫1962 年 7 巻 1 号 p. 1-6
発行日: 1962/03/30
公開日: 2011/07/05
ジャーナル フリーA rod-type extensometer has been set up parallel to the direction in which a wire-type one had been set up and comparative observations of crustal strains in this same direction were started on October, 1951 at Osakayama Observatory. The results of the observations in these ten years are as follows, (1) variations of the tidal strains observed by the two extensometers coincide with each other not only in phases but also in amplitudes, (2) seasonal variations, of the crustal strains coincide with each other in phases, but not in amplitudes. (3) observed strains are sometimes opposite in phase, but they coincide again after a few days or after several months, (4) ground contractions observed by these two extensometers are both 2×10-5c.g.s. in these ten years. And now, two bar-type's extensometers have been set in both the extended lines of the base line of above-mentioned extensometers, aparted 220m. and 140m. from it, and the comparative observations have been started. It will be able to assume the wave-lengths of the strain-distributions of the crust according to these observations.抄録全体を表示PDF形式でダウンロード (699K) -
須川 力1962 年 7 巻 1 号 p. 7-15
発行日: 1962/03/30
公開日: 2010/09/07
ジャーナル フリーThe lunar tidal effect on the vertical has been detected from the international latitude observations with the visual zenith telescope at Mizusawa in the years 1935-1955. The semi-diurnal terms or M2 tide-constituents aredψ=0".0091 cos (2t_??_-3°), 1+k-l=1.18 for 1935-1947, dψ=0".0123 cos (2t_??_-52°), 1+k-l=1.60 for 1947-1955, dψ=0".0102 cos (2t_??_-44°), 1+k-1=1.32 for 1935-1955.The combination of Love numbers L or 1+k-l appears, therefore, to be more significant than that in the years 1900-1935 (L=0.38 by E. Nishimura and L=0.64 by E.I. Evtuschenko). The simultaneous latitude observations with the floating zenith telescope has been analysed to investigate the lunar tidal effect on the vertical in the years 1943-1955. The results obtained from the FZT seem to coincide almost exactly with those by the VZT as follows:dψ=0".0102 cos (2t_??_-23°), 1+k-l=1.32 with the FZT, dψ=0".0103 cos (2t_??_-15°), 1+k-l=1.34 with the VZT. Therefore no systematic difference of the lunar tidal effect between different instruments has been found for the sufficiently long interval. The fact suggested by K. Hosoyama that the mode of time variation of the L-values appears to correlate just negatively with that of the Chandlerian motion has been investigated fully through the whole period 1900-1955. It would be, however, desirable to determine more precisely the recent variation of the Chandlerian motion and examine the intrisic relation between the Love numbers k and 1 together with the simultaneous observations of tidal strain of the earth's surface with the extensometer which determine the Love num-bers h and 1. It seems probable that there may be exist any negative correlation between the Chandlerian motion and the lunar tidal effect on the vertical deduced from the latitude observations.抄録全体を表示PDF形式でダウンロード (1112K) -
中川 一郎, 船曳 満, 田中 寅夫1962 年 7 巻 1 号 p. 16-29
発行日: 1962/03/30
公開日: 2011/07/05
ジャーナル フリーThe tidal variation of gravity observed at any point on the earth is generally composed of two parts. Namely, one is a real earth tidal variation caused by the direct effect of tide-generating force due to a celestial body, and the other is a change with the indirect effect caused by the oceanic tides and meteorological disturbances. In this paper, there are detailed descriptions of the final results of harmonic analysis after the full corrections based on the data obtained at eleven stations in Japan by means of the Askania Gravimeter No. 111 during a period of about two years from July 1957 to May 1959, and furthermore the local characters of observed value of the tidal factor affected by the oceanic tides and others are in detail treated. From these considerations, it is concluded that the most reliable value of the tidal factor of gravity (G≡1-3k/2+h; h, k : Love numbers) in Japan free from the influence of oceanic tides is 1.14 and that the phase lag is very small even if it exists. A discussion is made comparing these conclusions with results recently obtained at some stations in the world.抄録全体を表示PDF形式でダウンロード (3448K) -
山口 生知1962 年 7 巻 1 号 p. 30-33
発行日: 1962/03/30
公開日: 2010/09/07
ジャーナル フリー神戸海洋気象台の森安茂雄氏が,昭和33年12月の日本海洋学会誌に,“月平均潮位に及ぼす海況の影響,”と題して,串本と浦神における月平均潮位の変化の差がはなはだしく大であることを報告した.著は約32年前に同じ題目の研究をして東京大学地震研究所の彙報に報告しておし,た.その時に串本は油壷に比較して平均潮位の変化が多少大であることを知つた.しかるに今回の森安氏の報告のようなはなはだしく大きな変化のあることは予期しなかつた.いささか不思議に思われたので再び調査を試みた.その結果は串本はそれほど変化が大でもないが浦神の1951年9月のごときは前月の8月に比して年周変化を取り去つてもなお月平均潮位が200mmも高いことが分つた.これは海水温度の月平均変化が10℃にも相当する.この原因として,串本と浦神とはわずか14.5kmしか離れないのであるから,黒潮暖流の影響の差としては,どうしても考えられない.むしろ雨の影響であるかも知れないと瓜われる. その後東京大学地震研究所の岡田惇氏が昭和34年の11月に水準測量を実施された,しかして傾斜量として,-1".04という値を得た.これに相当する値を月平均海水面変化より求めるには,測址を実施した.月の値が必要であるが,残念ながらDataがないので,これにもつとも近い同年4月の諸修正を施して,しかもなめらかにした月平均海水面の差を採つて計算して見た.すなわち串本と浦神の差が70mmで距離が14.5kmであるから丁度-1".0となつて岡田氏の測量の結果と一致する値を得た.この値の一致は偶然かも知れないが,串本と浦神との平均潮位の差が海況の影響によるものと考えるよりは,むしろ地盤の傾斜によるものと考える方が妥当であると思われる.抄録全体を表示PDF形式でダウンロード (301K)
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