巻号一覧
33 巻 (1987)
- 4 号 p. 299-
- 3 号 p. 171-
- 2 号 p. 89-
- 1 号 p. 1-
33 巻, 4 号
選択された号の論文の13件中1～13を表示しています
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古澤 保, 大谷 文夫, 寺石 眞弘1987 年 33 巻 4 号 p. 299-306
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーAt the Miyazaki Crustal Movement Observatory, data acquisition and analysis for observation network of crustal activities are executed on multi-computers system. This data processing system is operated with a view to detect the phenomena related to the occurrence of earthquakes at Hyuganada. Analysis of data by extensometers at the Miyazaki observatory reveals an abnormal extension in E3 component 6 hours before the occurrence of the earthquake on March 18, 1987 (M=6.6). It is also suggested that the earth tides in E3 data are magnified slightly after rainfalls.抄録全体を表示PDF形式でダウンロード (841K) -
―1986年伊豆大島噴火に関連した南伊豆,岡田における地殻変動の検定―上條 賢一, 藤井 陽一郎, 青木 滋1987 年 33 巻 4 号 p. 307-313
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーA method of estimation for sea level change in a time-series of mean sea level is proposed. When continuous 32 points are given in it and they have an increasing or decreasing trend, we can easily estimate the sea level difference between both ends of the term by this estimation method, in which pulse-decomposition method is adopted. As an example, the analysis of mean sea level at Minami-Izu and Okada is tried by this estimation method, because we are interested in the vertical crustal movement in relation to the 1986 Izu-Oshima Eruption. The real sea level changes between both ends of the terms are estimated with 95% confidence interval for abnormal upheaval of the earth crust.抄録全体を表示PDF形式でダウンロード (468K) -
萩原 幸男1987 年 33 巻 4 号 p. 315-320
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーSuppose gravity anomaly on a double-layer structure consisting of surface layer and underlying bedrock. We assume density contrast between them and mean depth to their boundary, and then we can calculate subsurface topography of the boundary by using, for example, Fourier series method or Fourier integral method. In these methods, elevation of the subsurface topography from the mean depth is assumed to be so small, that the second and higher powers of the elevation can be usually neglected. In some actual cases, such a neglect can not be correct. We propose in this paper a simple method for obtaining the subsurface topography without neglecting the second and higher powers of the elevation. The actual calculation result is shown in a figure.抄録全体を表示PDF形式でダウンロード (560K) -
小竹 美子, 萩原 幸男1987 年 33 巻 4 号 p. 321-328
発行日: 1988/03/25
公開日: 2011/07/05
ジャーナル フリーTerrain correction of the Bouguer anomaly is usually computed by neglecting topo graphy in zones distant from a measuring point. Such a neglect may result in truncation errors for Bouguer anomaly calculations. We estimate the truncation errors and their vertical gradients by using the worldwide elevation and bathymetric data set with a grid spacing of 5-min, latitude by 5-min. longitude, which was recently published by the National Geophysical Data Center, NOAA. The truncation error amounting to 150 mgal on Japan islands is caused presumably by the bathymetric topography of the Pacific Ocean.抄録全体を表示PDF形式でダウンロード (759K) -
―コンクリートの床面の変動―山内 常生1987 年 33 巻 4 号 p. 329-336
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーContinuous observations of crustal deformations by extensometers which have many detectors have been carried out at the Mikawa Crustal Movement Observatory since October 1978. In this paper, a detailed comparison of strain changes observed with detectors on the basement rock and on the concrete floor is mainly described. It was found that there was a good coincidence between them over the whole period from the tidal variation to the secular change. It seems that the crustal deformations by extensometers are hardly affected by the deformation of the cement itself.抄録全体を表示PDF形式でダウンロード (746K) -
日置 幸介1987 年 33 巻 4 号 p. 337-345
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーThe final stage of the geodetic VLBI data analysis is the adjustment of various "stationary" parameters such as station positions and additional "non-stationary" para meters such as the inter-station offsets of atomic clocks and atmospheric zenith path delays. With the conventional least-squares estimation method, complicated techniques have been needed to estimate the parameters with temporal variation. For example, the variation of clock offsets is usually assumed to be represented by a set of para bolic curves connected by several discontinuities. With a new parameter estimation method based on Kalman filtering technique, both the deterministic estimation of stationary parameters and the tracking of the values of non-stationary parameters varying according to some stochastic process are possible. This enables the VLBI parameter estimation without operator-dependent procedures to modelize such temporal variations. It is also shown that the higher repeatability of the baseline lengths is obtained by Kalman filter method than by the conventional least-squares method.抄録全体を表示PDF形式でダウンロード (964K) -
井内 登, 細野 武庸1987 年 33 巻 4 号 p. 347-359
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーFrom the precise levelling survey along the route connecting Kakegawa to Omaezaki, it is clear that there exists the yearly change of the ground movement at Hamaoka near Omaezaki, whose pattern indicates the subsidence in winter and the reverse in summer. Some source mechanisms have been presented to interpret the phenomenon, however they are not su licient enough to express both the magnitude and phase of the yearly change curve. A new idea is brought forward from the study of the precise levelling results and the tiltmeter records observed at Omaezaki. On the tiltmeter record the difference between day time (10 AM-4 PM) mean value and daily mean value is not always constant through the year and it takes the distri bution pattern such as maximum value in July and minimum in December. It is deduced that the crustal movement revealed by the tiltmeter exists also in the levelling results because the levelling survey is usually performed in the day time. Consideration is given on the tidal load effect and further on the tidal potential theory.抄録全体を表示PDF形式でダウンロード (1026K) -
国際測地学協会第I分科位置の決定石原 正男1987 年 33 巻 4 号 p. 361-363
発行日: 1988/03/25
公開日: 2011/07/05
ジャーナル フリーIAG第一分科は,以前は「三角測量」(triangulateon),「基準点測量」(Control Surveys)と呼称されていたが,測地技術の進展により1980年代からは,現在の呼称である「位置の決定」(positioning)に変えられたこのことは,新しい測量方式や測量器械の開発がここ20～30年の間に目まぐるしく進められ,分科の名称をより包括的なものにせざるを得なくなった事情を反映している.現在の第一分科では“精密測地網”(High precision horizontal and vertical network),“衛星及び二次元測位”(Satellite and spatial potisioning),“慣性測量”(lnertial positioning),“天文測地”(Geodetic astroriomy),“海洋測位”(Marine positioning)及び“大気屈折”(Refraction)の5つのテーマが扱われることになっている.これらのテーマに関して今回の会議では,衛星測地では,“GPSの地球物理学へのインパクト”(lmpact of Global Positioning System on Geophysics)と題するシンポジウムが,IUGG全体のシンポジウムとして別個に取扱われ,位置の決定においてGPS時代到来を大々的に告げるものとなった. 以下,第一分科関係のシンポジウムで印象に残った研究発表を中心に今回の会議内容を紹介する。抄録全体を表示PDF形式でダウンロード (301K) -
土屋 淳, 斎藤 隆1987 年 33 巻 4 号 p. 364-366
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (347K) -
大久保 修平, 福田 洋一1987 年 33 巻 4 号 p. 367-368
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (183K) -
藤本 眞克1987 年 33 巻 4 号 p. 369-370
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (174K) -
大江 昌嗣1987 年 33 巻 4 号 p. 371-372
発行日: 1988/03/25
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (238K) -
横山 紘一1987 年 33 巻 4 号 p. 373-376
発行日: 1988/03/25
公開日: 2011/07/05
ジャーナル フリーPDF形式でダウンロード (393K)
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