巻号一覧
12 巻 (1966 - 1967)
- 3-4 号 p. 127-
- 2 号 p. 71-
- 1 号 p. 12-
12 巻, 3-4 号
選択された号の論文の7件中1～7を表示しています
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I.座標平均計算石川 甲子男, 市原 満1967 年 12 巻 3-4 号 p. 127-132
発行日: 1967/03/31
公開日: 2010/09/07
ジャーナル フリーIt is researched what influence have inappropriate data on the adjustment of triangula-tion by variation of co-ordinates. In this case, the inappropriate data include not only so-called observational errors but also unexpected errors, which do not belong to statistic time series, for example, reading error of the observational instrument, punching error for processing by digital computer, and so on. It is shown that there are two cases: in one case, the inappropriate data have direct influences on the results and, in the other case, they have scarcely any influence on the results. Generally, it is able to find out where inappropriate data are by calculation of the residuals in the method of the least squares. It is also assured that this procedure is an effective means for the adjustment by variation of co-ordinates. These matters will offer useful data in electronic data processing.抄録全体を表示PDF形式でダウンロード (508K) -
佐野 浚一1967 年 12 巻 3-4 号 p. 133-139
発行日: 1967/03/31
公開日: 2011/03/01
ジャーナル フリーThe radioisotope observation well for landsubsidence was developed in order to measure vertical distribution of compaction of formations in a well. Depth of the radioisotope radiation sources which are shot into formations around the well, is measurad at such an interval as a year and compaction of formations is obtained from the relative displacement of the radiation sources shot at various depths. The two radioisotope observation wells were sunk in Niigata City and compaction of formations has been observed for five years. Although the accuracy was not always enough to measure precisely the distribution of compaction mainly due to weak radioactivity of the sources, the observation results cor-respond to the drainage of ground water and the injection to aquifers.抄録全体を表示PDF形式でダウンロード (1024K) -
須川 力, 北郷 拓1967 年 12 巻 3-4 号 p. 140-150
発行日: 1967/03/31
公開日: 2011/07/05
ジャーナル フリーLatitude observations with the visual zenith telescope (VZT) and the floating photo-graphic zenith telescope (FZT) were made according to the same ILS star system during the period from 1964 to 1966 at Mizusawa. In this note the comparison of observations with both instruments is fully discussed.
The difference between monthly mean latitudes with the FZT and those with the VZT show the fairly conspicuous semi-annul variation which gives two maxima in May and November. This semi-annual variation may be attributed to the diurnal variation of atmospheric temperature.
The diurnal variations of latitude, free from the effect of an error in the aberration constant, have been deduced from closing errors for both instruments as follows.
0″.030sin(θ-α+16h)for the VZT,
0″.008sin (θ-α+24h) for the FZT,
where 0 denotes the mean longitude of the sun and a is the mean right ascension of a group. The amplitude for the FZT, 0".008, may be explained by the effect of the room refraction. and the phase for the FZT (24h) is near to that for various visual instruments at Pulkovo (22h). Consequently, the diurnal variation for the FZT seems to be more stable to the effect of the accumulated accidental errors between consecutive group mean latitudes than that for the VZT.
The errors of observations are estimated by two ways: the one is derived from resi-dual latitudes of individual pair from daily mean latitude (internal error) and the other form discrepancies of daily mean latitudes from normal latitude which is interpolated from the effect of polar motion (external error). The internal errors for the FZT are relatively smaller than those for the VZT, but the external errors for the former are of nearly same order as those for the latter.
We may conclude that latitude observations with the FZT can give the nearly same contribution to the determination of the polar coordinates in the ILS as the VZT.抄録全体を表示PDF形式でダウンロード (1326K) -
小沢 泉夫1967 年 12 巻 3-4 号 p. 151-156
発行日: 1967/03/31
公開日: 2011/03/01
ジャーナル フリーThe observation of the tidal tilting in the direction of N 38° E at Osakayama Observatory has been performed with a recording water-tube tiitmeter whose base length is 60 meters and sensitivity is 0.00173"/mm and 0.00346"/mm. From the analyses of two periods of one month and a period of six months of ist observation, we have obtained some tidal com-ponents (M2, S2, K1, O1, P1, J1 and K2), and have calculated the period range of the daily variation.
According to our analyses, we have the following results,
(1) the ratios O1/K1 and P1/K1 of the observed values are almost equal to those of the theoretical values. But the ratios K1/M2, O1/M2 of the observed values are about 16 times as large as those of the theoretical ones; the observed semi-diurnal components are very smaller than those of the theoretical ones which are direct effect of the ground tilt due to the tide generating force. It is the reason why that the difference between the phase of the direct effect of the semidiurnal component and that of the load tilt due to the oceanic tide is almost 180: Assuming the diminishing factor D is equal to 0.70, we are able to estimate adequately that the amplitude of the M2-component of the load tilt is 0.97 times as large as that of the direct effect. On the contrary, the difference between the phases of the diurnal components of the direct effect and those of the load tilts are small, and their amplitude of the load tilt are from 1.1 to 1.7 times as large as those of the direct ones. So it seems that the observed amplitudes of the diurnal tides are emphasised.
(2) the ratio S2/M2 of the observed values is about 2.5 times as large as that of the theoretical ones. It shows that the solar tide has an another effect than that of the lunar tide. The residual of the observed value which is subtracted the direct effect and the estimated load tilt for S2-component is as follow
0.0012" cos (2t-266°) .
On the other hand, the ground tilt due to the air-tide is calculated as
0.00054" cos (2t-163.6°) .
(3) the period of the daily variation is equal to 24 hours exactly. It seems that the effect of the air tide for S1-component is smaller than 19% of it, and the greater part of the S1-component is caused by the solar radiation.抄録全体を表示PDF形式でダウンロード (780K) -
Yoshibumi TOMODA, Jiro SEGAWA1967 年 12 巻 3-4 号 p. 157-164
発行日: 1967/03/31
公開日: 2011/07/05
ジャーナル フリーMeasurement of gravity and total magnetic force at sea was carried out on board the Umitaka maru off Sanriku district and around Hokkaido district in the period between July-Aug. 1966. The results are summarized as follows.1) There are zones of conspicuous negative Bouguer gravity anomaly between Kushiro and Cape Erimo and between Cape Erimo and Muroran.2) Bouguer gravity anomaly at Tsugaru straits is about +100 mgals and the values are not so different compared with those estimated from the land values.3) Free air gravity anomaly in the Japan sea between Hokkaido and east coast of Siberia is about +25 mgals.4) Negative free air gravity anomaly near Wakkanai seems not to extend to Rebun Island.5) The maximum positive Bouguer gravity anomaly on the continental shelf off San riku district is +200 mgals at off Ofunato.6) There was found small negative Bouguer anomaly at the region 10-20 miles off Choshi.抄録全体を表示PDF形式でダウンロード (733K) -
Yoshibumi TOMODA, Kinichiro KOIZUMI1967 年 12 巻 3-4 号 p. 165-172
発行日: 1967/03/31
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (742K) -
虎尾 正久1967 年 12 巻 3-4 号 p. 173-175
発行日: 1967/03/31
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (369K)
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