All issues
Volume 27 (1981)
- Issue 4 Pages 225-
- Issue 3 Pages 155-
- Issue 2 Pages 75-
- Issue 1 Pages 1-
Volume 27, Issue 3
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
Izuo OZAWA1981 Volume 27 Issue 3 Pages 155-163
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSAn ellipsoid of the observed strain is not perfectly analogous to the ellipsoid of the applied force on the crust, generally. In order to study the anisotropic strain of the crust, observations of the areal strain on the earth tide, the load tide caused by the oceanic tide, and the anomalous strains caused by rapid changes of the atmospheric pressure and heavy rain have carried out in some azimuths at the Osakayama Tunnel and the Suhara Observatory.View full abstractDownload PDF (503K) -
Masaru KAIDZU1981 Volume 27 Issue 3 Pages 164-172
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA precise gravity survey plays an important role in the study of recent crustal movement. For this purpose, Geographical Survey Institute introduced a LaCoste & Romberg Model D gravity meter in 1977. Although it is accurate enough in a labolatory, its representivity in the field is about 150 nm/sec2 . To clarify the reason of this, four possible noise sources were examined. They are short term drift related to clump history, long term drift related to re-set, effect of inner temperature variation, and effect of car traffics. Among these four possible noise sources, the effect of car traffics is supposed to be the most efficient noise source .View full abstractDownload PDF (660K) -
Fumiaki KIMATA, Tsuneo YAMAUCHI1981 Volume 27 Issue 3 Pages 173-182
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSContinuous EDM (electro-optical distance measurement) with Geodimeter 6BL and measurements of lower atmospheric temperature were made during 101 hours from December 19 to 23, 1977, in order to investigate the relation between the observed daily variations of the distance and lower atmospheric temperatures. The distance of the baseline was about 7.3 km and the total number of the data were 1141. Errors in the data corrected for the air temperatures at high altitudes are almost within ±1.0×10-6 at any time, but the data corrected for the surface temperatures show daily variations with amplitudes of about 60 mm (8.0×10-6) and the data at night show remarkable disagreements with the mean value corrected for the air temperature at high altitudes. The temperature gradient of lower atmosphere is little at sunset and errors in the data obtained within a few hours around sunset are almost less than ±1.0×10-6 even if the data are corrected for the surface temperatures. It is found that, judging from the results of the Sangane-Zaoh base-line, an accuracy of about ±1.0×10-6 in the EDM corrected for surface temperature may be obtainable throughout the year if the EDM is made within a few hours around sunset.View full abstractDownload PDF (2150K) -
(An experiment on the earthquake fault of the Izu-Oshima Kinkai Earthquake of 1978)Hiroshi SATO, Seizo KAKISHITA1981 Volume 27 Issue 3 Pages 183-191
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSAn experiment of aero-triangulation has been made in Izu Peninsula for the purpose of detecting the fault movement of the Izu-Ohshima Kinkai Earthquake by means of aero-survey, instead of ground triangulation. The measurement in Inatori area where a trace of earthquake fault was found gives a nearly same result as the one obtained from field investigations, that is, relative displacement of the Inatori-Omineyama Fault was measured as about one meter in average. The experiment in Hachiyama area shows a clear discontinuity of about 80 cm in the horizontal displacement vectors along the fault line estimated from seismological and geodetic data, though any remarkable fault trace was not found there. The results of present experiment suggest that the method of aero-triangulation is usef ull means for the detection of earthquake fault.View full abstractDownload PDF (1026K) -
Minoru TAZIMA, Kazuo KOMAKI, Kei NISHI, Hitoshi HARUYAMA1981 Volume 27 Issue 3 Pages 192-203
Published: December 30, 1981
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSWith numerical experiments and considerations concerning the degree of freedom of free networks, the following results have been obtained. In the case of fixing a figure on a plane or a sphere, there are three degrees of freedom, that is, two for the translation and one for the rotation. However, free networks on general curved surfaces do not necessarily have the three degrees of freedom when the radius of curvature varies according to the position on the surface. As the simplest case of geodetic networks on the reference ellipsoid, the adjustment of rhombus network was studied by numerical analysis. When the size of the network becomes larger than the order of a few tens of kilometers, several peculiar phenomena appear which differ from ordinary results on a spherical surface.View full abstractDownload PDF (1077K) -
Yoichi FUKUDA, Sachio NABETANI, Hiroshi WATANABE, Masaaki ASADA1981 Volume 27 Issue 3 Pages 204-213
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe application of national numerical information to Landsat data processing has been proposed. The digital terrain data (KS-110) have been employed to make a stereo pair of Landsat images, while a shaded relief image and a stereo pair of shaded relief images have been also made from KS-110 in the preliminary stage of processing. The shaded relief images have following advantages compared with Landsat images; (i) easy production of the image which covers extensive area, (ii) free choice of direction of the Sun light and of eyes, (iii) no interruption of the clouds, while they have worse resolution than Landsat images. Therefore, they are valuable not only because of the assistance for Landsat image analysis, but also valuable, in themselves, as an expression of topography. A stereo pair of Landsat images is a very useful tool for geological interpretation nevertheless some technical problems; for example, deterioration of image quality, remain in the present study. However, these problems are not essential, the value of the stereo pair of images will be increasing especially when the resolution of the digital terrain data will be finer.View full abstractDownload PDF (4957K) -
Manabu YATABE1981 Volume 27 Issue 3 Pages 214-215
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSGravity changes induced from vertical crustal movements can be expressed by four terms in the mathematical formulation: the attraction changes due to the free-air gradient, the inflow or outflow of crustal materials, the surface displacements and the redistribution of mass within the crust . However, it is theoretically demonstrated by using Green's theorem that the last two terms cancel each other .View full abstractDownload PDF (198K) -
Tsutomu SAITO1981 Volume 27 Issue 3 Pages 216-217
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe identity for the residuals of the least squares solutions between the equations of parameters and correlates is rigorously proved under the assumption that the mathematical structures with respect to the respective observed quantities are strictly identical .View full abstractDownload PDF (200K) -
Tsutomu SAITO1981 Volume 27 Issue 3 Pages 218-219
Published: December 30, 1981
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSIt is proved that the condition such the sum of the corrections is zero for the adjustment of vertical networks and for the station adjustment of direction observations as well, is equivalent to that of the minimum norm-least squares by the variation of parameters, and that the adjusted elevations are dependent on the irregular parts of the assumed elevations in the adjustment.View full abstractDownload PDF (211K)
- |<
- <
- 1
- >
- >|