巻号一覧
23 巻 (1977)
- 4 号 p. 213-
- 3 号 p. 135-
- 2 号 p. 57-
- 1 号 p. 1-
23 巻, 1 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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田島 稔, 矢口 彰1977 年 23 巻 1 号 p. 1-8
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリーThe direct and inverse geodetic problems based on the M0L0DENSKII's closed for mulas were solved by the iteration computation method for non-linear function equation system. The results of numerical examples are as follows.(1) In medium and large distance problems having 40 km-120 km, the final converged values were obtained after two or three iterations with the accuracy of 1"×10-12 in angle and 1×10-8 cm in distance as shown in Table I.(2) In the case of short distance problem having the latitude and longitude differences of both 1" and elevation difference of 400 m between two geodetic points, however, an error of 5"×10-11 or so still remained after 8 iteration computations. Furthermore, in a very short distance problem (the latitude and longitude differences of both 0.1" and elevation difference of 400 m), about 10 iterations were required for obtaining the accuracy of 1"×10-10. The reason of such slow convergent speed in the iteration for solving short distance problems seems to originate from the socalled cancelling error, which appears in the computation of formulas containing the form of the subtraction of nearly equal two terms such as MOLODENSKII's formulas.抄録全体を表示PDF形式でダウンロード (744K) -
中根 勝見1977 年 23 巻 1 号 p. 9-16
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリーFor calculating displacement vectors of crustal movements from repeated triangulation surveys, it is convenient to put the old survey coordinate X as the approximate coordinate for every unknown station in new survey adjustment because of the simplicity that displacement vectors are equal to the unknown x in the new survey adjustment. The adjustment of free network is the most usefull in the customary methods because it does not need any fixed stations in the network. However, there is a problem that some large displacement vectors are distributed to all the triangulation stations in the network in this method. To avoid such a problem we have an idea of regulating the movement of a geodetic triangle consisting of three stations. The chosen three stations are controlled by the following conditionsROTATION =0, and TRANSLATION =0, and if the network has no measurement of distance, in addition to them the other conditionDILATATION =0is added. In choosing the control stations they should be located in a stable area in the network.抄録全体を表示PDF形式でダウンロード (581K) -
関口 直甫1977 年 23 巻 1 号 p. 17-24
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリー極運動の励起関数が,極運動周期に比較すれば短時間しか継続しない,互に独立な無秩序の励起から成ると仮定し,極位置と励起関数とを含む若干の関係式を導出した.また励起を特徴づけるために1つのパラメーターを使用することが便利であることを述べ,原理的に異る2つの方法,すなわち極半径の自乗平均および極軌道の3次差による方法によりそれぞれパラメーターの値を80±54,40±17(s.e.)(0".001)2.yrと計算した.この励起モデルは,WILSON and HAUBRICH(1976)の結果とも無矛盾であることが示される,抄録全体を表示PDF形式でダウンロード (690K) -
井筒屋 貞勝1977 年 23 巻 1 号 p. 25-35
発行日: 1977/06/25
公開日: 2011/03/01
ジャーナル フリーThe Mogi model is an important approach to the crustal uplift associated with volcanic activities on the basis of elastic deformation of a semi-infinite solid with a spherical cavity. The multiple Mogi model newly proposed in this paper is an approach to a dilatant expansion of the crust, in which many spherical microcracks lie scattered under the Gaussian distribution law of statistics. Theoretical considerations of the shape of the Matsushiro uplift suggest that a multiple Mogi process has most probably taken place in the swarm epicentral region. roundwater flow into microcracks has made pore pressure increasing during th period of uplift. After spring water flowing along the fissure zone, the mean depth of micro crack istribution has become shallower due to the upward expansion of the dilatant zone and then the horizontal length scale of the dilatant zone has become greater than the vertical scale.抄録全体を表示PDF形式でダウンロード (993K) -
井筒屋 貞勝1977 年 23 巻 1 号 p. 36-41
発行日: 1977/06/25
公開日: 2011/03/01
ジャーナル フリーGravimetric comparisons have repeatedly made between the Tokyo and the Kakioka Fundamental Gravity Stations since 1963 by using LaCoste & Romberg gravimeters. The Gravity difference between them amounts to about 177 mgal. The gravity value at the Tokyo Fundamental Gravity Station relative to the Kakioka Station decreased at a rate of 11μgal/year till 1969, but afterwards it has turned increasing at a rate of 18, i gal/year during these three years. The gravity decrease is well coincident with the groundwater leveldown whichwas accompanied with the ground subsidence. On the other hand, the gravity in crease can be explained as the ground water level recovery. We estimate effective porosity of soil as about 20% in the gravity-decreasingperiod and 18% in the increasing one. Judging from these results, we conclude that the soil consolidation due to the ground subsidence has scarecely occurred throughout.抄録全体を表示PDF形式でダウンロード (2084K) -
萩原 幸男1977 年 23 巻 1 号 p. 42-43
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリー海岸付近では,海水荷重の潮汐変化が地殼を変形させることによる重力変化と,海水質量の移動による重力変化とが大きい.このほかに,潮位とともに変化する地下水位が重力を変化させることも考えられる.ここでは,地下水位が拡散型の方程式をみたすものとして,その時間的変化を解き,関連する重力変化を求める.結論として,砂地の海岸低地では海岸より50m離れれば,地下水位変化の重力場への影響は,一応考えに入れる必要がないことがわかった,抄録全体を表示PDF形式でダウンロード (180K) -
藤田 尚美1977 年 23 巻 1 号 p. 44-45
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (217K) -
我如古 康弘1977 年 23 巻 1 号 p. 46-47
発行日: 1977/06/25
公開日: 2010/09/07
ジャーナル フリーThe evaluation of the truncation error coefficient Qn introduced by MOLODENSKII et al. requires generally a complicated mathematicalprocess especially at high degrees, if we want to obtain accurate values of Qn The author presents a practical approximation formula which can be used of evaluate Qn at high degrees with a sufficient accuracy for the practical\purpose and to decrease computer time drasti cally.抄録全体を表示PDF形式でダウンロード (225K)
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