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Volume 25 (1979)
- Issue 4 Pages 261-
- Issue 3 Pages 185-
- Issue 2 Pages 71-
- Issue 1 Pages 1-
Volume 25, Issue 3
Displaying 1-4 of 4 articles from this issue
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Eiki ONODERA1979 Volume 25 Issue 3 Pages 185-193
Published: December 25, 1979
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe effects of the mass transport in the oceans are investigated on the polar motion, especially on the libration of the mean pole. The excitation functions are computed, using FOFONOFF's materials of the North Pacific and North Atlantic Oceans . The present conclusion is that the change of the mean pole due to the ocean variations is smaller in order of magnitude than the actual libration, but some similar trends of variations seem to exist between the two, which suggests the presence of some causal relation between the motion of the mean pole and ocean variations.View full abstractDownload PDF (621K) -
Chuichi KAKUTA, Katsuhisa SATO, Koji HORIAI1979 Volume 25 Issue 3 Pages 194-208
Published: December 25, 1979
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSYUMI et al. (1979) showed that the Doppler observations derived from the Topographic Center, U.S.A. do not show any local behaviors in latitude variations, which are found in the astronomical observations. The different behavior of the Doppler latitude is studied by separating the passes of the satellite into the north and the south bound cases and by finding a systematic error of the mean anomaly (along track error) between two passes. Comparison between the astronomical latitude and the Doppler latitude shows that the astronomical latitude decrease (increases) when the star whose right ascension equals to that of the ascending (descending) node of TRANSIT satellite 30190 is observed in the annual astronomical program. Improvement of models of the geo potential might be responsible for differences of the Doppler latitude between the north and the south bound passes. Variation of latitude obtained by the Doppler observation shows a diurnal variation with the period of 23h56m35s and 24h3m39s in sidereal time.View full abstractDownload PDF (2264K) -
Yukio HAGIWARA1979 Volume 25 Issue 3 Pages 209-210
Published: December 25, 1979
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSShort-wavelength Bouguer anomaly, cutting off a wavelength of over 160 km, reflects shallow geological structures inside the crust. The shallow-focus earthquake epicenters are plotted on the short-wavelength Bouguer anomaly map of the Northeast Japan to find that seismic activities there migrate along the trend of the short-wavelength Bouguer anomaly. In the Southwest Japan, however, the epicentral distribution has no clearcut relation.View full abstractDownload PDF (1057K) -
NATIONAL REPORT TO THE XVII GENERAL ASSEMBLY CANBERRA, AUSTRALIA 2-15 DECEMBER 1979THE SECTION OF GEODESY, , THE NATIONAL COMMITTEE FOR GEODESY AND GEO ...1979 Volume 25 Issue 3 Pages 215-260_3
Published: December 25, 1979
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe Geographical Survey Institute is responsible for the national fundamental survey, which has been carried out for the past century as the basis for the mapping and the engineering works. The works at present are to establish and maintain the control points throughout Japan. Although data obtained are still essential for map making, development and conservation of the land, main purposes of the fundamental survey at present time is to get inf ormations for the prediction of the earthquake and to set up the control points for the area where large scale mapping or cadastral surveys are planned. The geodetic fundamental survey comprises a number of surveys: Precise geodetic survey, Precise traverse survey, Quadrilateral base line survey, Levelling and Astronomical observation.View full abstractDownload PDF (12676K)
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