巻号一覧
33 巻 (1987)
- 4 号 p. 299-
- 3 号 p. 171-
- 2 号 p. 89-
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33 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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―1983年日本海中部地震に関連した深浦・男鹿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 2 号 p. 89-96
発行日: 1987/08/25
公開日: 2010/09/07
ジャーナル フリーA unified method for analysis of short time-series with observational error is proposed in order to make characteristics of the time-series clear. When 32 points are given in a certain time-series, the orthogonal array L32, whose columns correspond to discrete pulses, is used in this analysis method. These pulses are so-called factors in Design of Experiments. We pick up several main basic pulses and sub-basic pulses which are considered as orthogonal basic vectors in Vector Space, and other random pulses are assumed to be error pulses. Analysis of variance (ANOVA) is used in this method, and significant pulses are detected by F test with 5% significant level . We can easily classify any time-series into several types by the result of ANOVA. As an example, mean sea level analysis at Fukaura and Oga is tried by this method, because we are interested in the earth crust movement in relation to the 1983 Central Japan Sea Earthquake. The result shows that the patterns of the real fluctuations of mean sea level are very similar in the both areas, and abnormal upheaval of crust before the earthquake was found as a statistically significant phenomenon .抄録全体を表示PDF形式でダウンロード (659K) -
関口 直甫1987 年 33 巻 2 号 p. 97-100
発行日: 1987/08/25
公開日: 2010/09/07
ジャーナル フリー従来,チャソドラー周期は極位置が平均位置の周囲を回転する周期として定義されて来た.しかし,励起極の運動はチャソドラ___.周期成分を含まない筈であるから,チャソドラー周期成分を除去した後の励起極運動が最小となるようにチャソドラー周期を決定することができる.これは約416(平均太陽)日と計算され,各瞬間の励起極の周囲の角速度に対応する周期を意味し,地球内部構造から理論的に推定される筈のものである.最近の高精度の極位置観測結果から求めた計算は,この周期の実在性を示唆している.抄録全体を表示PDF形式でダウンロード (383K) -
檀原 毅1987 年 33 巻 2 号 p. 101-106
発行日: 1987/08/25
公開日: 2010/09/07
ジャーナル フリーThe method to obtain the maximum tilt and its azimuth for a single sheet of rock on which a single route of levelling survey is established may be applied to a levelling net of closed circuits. Of course, the azimuthal directions of combined line between 2 bench marks for a closed circuit cover far more directions than those for a single route. Accordingly, considerably reliable values of the maximum tilt and its azimuth can be obtained. In connection with the project of earthquake prediction, intervals of repeated levelling surveys tend to be shortened, and quantities of crustal movements are occasionally small. In such cases, reliable contour lines of movements can not be drawn, but secular change of the maximum tilt and its azimuth can be used as the monitor of the movement of the earth's crust.抄録全体を表示PDF形式でダウンロード (492K) -
井内 登, 吉村 愛一郎, 今給黎 哲郎, 田中 穰1987 年 33 巻 2 号 p. 107-114
発行日: 1987/08/25
公開日: 2010/09/07
ジャーナル フリーTo enhance earthquake prediction in the Tokai area, tilt measurement by means of a long water-tube tiltmeter has been conducted in Omaezaki, Shizuoka Prefecture ever since 1979. The water-tube of the tiltmeter is approximately 330 meters long and is laid in an E-W direction about 1.5 meters under the ground. An eight year tilt-record indicates two phases in the vertical movement, a long term trend of eastward uplift and a short term trend which is pretty much in agreement with the sea level change at Omaezaki. A precise levelling survey carried out in the vicinity of the tiltmeter, on the other hand, explains an eastward subsidence, which is a reverse tendency in comparison to the tiltmeter readings. It is deduced that the eastward upward movement is caused by an abnormal local subsidence at the western point of the tiltmeter. The corrected record in which the long and short term tilt components are eliminated will be useful in detecting abnormal crustal movement resulting in a destructive earthquake.抄録全体を表示PDF形式でダウンロード (629K) -
NATIONAL REPORT TO THE XIX GENERAL ASSEMBLY VANCOUVER, CANADA 9-22 AUGUST, 1987THE NATIONAL COMMITTEE FOR GEODESY IN JAPAN, THE GEODETIC SOCIETY OF ...1987 年 33 巻 2 号 p. 115-169_1
発行日: 1987/08/25
公開日: 2010/09/07
ジャーナル フリーThe Geographical Survey Institute (GSI) is responsible for the national fundamental survey which has been carried out for the past century as the basis for mapping and engineering works. Main purpose of the fundamental survey is, at present, to get infor mation for the prediction of earthquakes by resurveying control points and to establish control points for the area where large scale mapping or cadastral survey is planned. The geodetic fundamental survey comprises a number of surveys; precise horizontal geodetic survey, levelling and astronomical observation.抄録全体を表示PDF形式でダウンロード (9115K)
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