巻号一覧
31 巻 (1985)
- 4 号 p. 295-
- 3 号 p. 247-
- 2 号 p. 163-
- 1 号 p. 1-
31 巻, 4 号
選択された号の論文の8件中1～8を表示しています
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竹本 修三, 土居 光, 平原 和朗1985 年 31 巻 4 号 p. 295-304
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリーA portable laser extensometer system was developed for precise measurements of shallow ground-strains. The system is able to detect two axial strains simultaneously. The resolving power of the system is 2 × 10-9/digit. The preliminary observation using the system has been carried on since March, 1985, at shallow trenches in Uji campus of Kyoto university. The stability of instruments for mechanical vibrations was examined by a loading test with a motercar straddling over extensometers. Accompanying the pumping of groundwater at three wells existing in the campus, strain changes of the order of 10-7 were observed. Strain changes caused by meteoro logical perturbations were an order of 10.6 at the most.抄録全体を表示PDF形式でダウンロード (1182K) -
田中 寅夫1985 年 31 巻 4 号 p. 305-312
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリーThe quantity of water vapor in the lower troposphere is an essential factor which controls the accuracy of precise surveying by the NAVSTAR GPS. We have investigated the time changes in the excess path delay by water vapor using data obtained from the routine radio zonde observations by JMA at Wajima, Yonago and Shionomisaki in Kinki District. It is concluded that the effect due to water vapor may be reduced within a range of 2-3 cm, without concurrent observation with a water vapor radiometer, by averaging results from a few days observations in winter, especially in February, under such a weather condition as low temperature and humidity on the ground surface.抄録全体を表示PDF形式でダウンロード (832K) -
上條 賢一, 藤井 陽一郎, 青木 滋1985 年 31 巻 4 号 p. 313-324
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリーA method of free networks adjustment by using orthogonal array, which is called TAGUCHI's orthogonal array in Japan, is proposed in this paper. This adjustment is based on so-called Design of Experiments. Generally observed land subsidence or upheaval are contaminated by leveling error, therefore analysis of variance (ANOVA) for leveling data should be applied in order to measure the observed value by its error. In this paper F test is used, and true difference between old data and new data for land subsidence or upheaval can be tested by F value assuming that significant level is 5%. Basic vectors in the Vector Space for each parameter are intersected orthogonally each other, i.e. It is evident that the observed vector is decomposed by orthographic projection. Then covariance among those unknown parameters are all zeroes, therefore it is intended for practical use.抄録全体を表示PDF形式でダウンロード (726K) -
上條 賢一, 藤井 陽一郎, 青木 滋1985 年 31 巻 4 号 p. 325-332
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリーIt is generally difficult to know features of a certain short time-series, because each data has measuring error. In this paper, simple and unified method for analysis of short time-series by using ANOVA (analysis of variance) is proposed. We use 4 basic pulses as cause factors in the time-series. L8 orthogonal array is used in this method, therefore basic vectors for each basic pulse are intersected orthogonally each other. We can easily classify time-series into several types by the result of ANOVA.抄録全体を表示PDF形式でダウンロード (484K) -
―クリープ面の存在―藤田 尚美, 海津 優1985 年 31 巻 4 号 p. 333-339
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリーThe Miura peninsula shows the anomalous vertical movement when there occurs a large earthquake along Japan trench or Sagami trough. To explain this phenomena, one of the authors (Fujita) proposed the following hypothesis. Under Kanto area, there is a weak zone which contains the fault plane of 1923 Kanto earthquake (let us name the plane as ‘C plane’), The C plane is sensitive to the change of areal strain and some part of the plane creeps when there occurs a large earthquake along Japan trench or Sagami trough. The strike of C plane coincides with the axis of Sagami trough and the dip is 30° in the landward side of the trough. The direction of creep is equal to that of the fault movement in the 1923 Kanto earthquake, SE20°. Therefore, the anomalous vertical movement in Miura peninsula is considered to be a good indicator for forth-coming large earthquake along Japan trench or Sagami trough. In this paper, the followings are deduced applying the hypothesis to the interpretation of the vertical movement in South Kanto area. 1) The general features in vertical movement in the South Kanto is considered to be the combination of subsidence of southern tips of both Boso and Miura peninsulas, uplift in the central part of Boso peninsula, occasional uplift in the southern part of both peninsulas and so on (Figures 1 and 3). 2) The 1968 event can be explained as follows. About 4 years before the 1968 Tokachioki earthquake, the creep started at south-eastern part of the C plane. The displacement reached about 30 cm. After the earthquake, the creeping area diffused into the sorrounding part of the C plane. The displacement reached 15-20 cm in about 3 years (Figures 4, 5 and 6). 3) The anomalous tilt of Miura peninsula, which appears 3-4 years before a large earthquake occurs along Japan trench or Sagami trough and lasts till 3-4 years after the earthquake (Fig. 6), can be explained by the mechanism similar to that mentioned in 2).抄録全体を表示PDF形式でダウンロード (629K) -
中堀 義郎1985 年 31 巻 4 号 p. 340-351
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリー国土地理院による第4回(1962～1968),第5回(1968～1975),第6回(1975～1981)全国水準点改測データを用いて,この間の北海道および離島を除く日本全国の地殼上下変動を,輪島験潮場を不動と仮定して求めた.変動量の計算方法は,まず日本海側の8験潮場(仮屋,萩,田後,三国,輪島,柏崎,鼠ケ関,男鹿,浅虫)の輪島に相対的な変動量を平均海水面の変動から求め,それを用いて輪島も含めた9験潮場の標高を与件とした網平均計算を行う方法を採用した.これは,日本列島が細長い弧状であり,水準測量の系統誤差や人為的な地盤沈下等の影響が累積するのを防ぐためである.このようにして求めた日本の地殼変動の特徴は,次のとおりである.(1)日本列島は,全体として沈下域の面積が広い.(2)東北の太平洋岸は,大きな速度で連続的に沈降している.(3)関東以西の太平洋岸の広い地域で,第4回から第5回測量までの期間沈降を示したが,第5回から第6回にかけては隆起に転じている.(4)四国西部では,継続的に隆起している.(5)(3)と(4)に述べた変動は,KATOが海水位変動から求めた地殼の変動と一致しない.抄録全体を表示PDF形式でダウンロード (1164K) -
松本 剛, 瀬川 繭朗, 神沼 克伊1985 年 31 巻 4 号 p. 352-365
発行日: 1986/03/25
公開日: 2011/07/05
ジャーナル フリー人工衛星による海面高データから重力分布を求めるため,ジオイドから重力への簡単な変換法の開発を行なった.600海里よりも長波長の成分については,地球重力ポテンシャルモデルの球函数展開係数(0～36次)を用い,これより短波長の成分については,ジオイド高データを地表の一点に接する平面上に技影したものに対して,フーリエ変換を適用した.海面高の10海里×10海里の格子データを求めるのに充分衛星軌道が密である場合には,このようにして求められた重力異常の精度は,20海里以上の波長成分について10mgal以内であると考えられる.抄録全体を表示PDF形式でダウンロード (1256K) -
1985 年 31 巻 4 号 p. 369
発行日: 1985年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (38K)
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