巻号一覧
28 巻 (1982)
- 4 号 p. 193-
- 3 号 p. 121-
- 2 号 p. 73-
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28 巻, 3 号
選択された号の論文の10件中1～10を表示しています
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坪川 恒也, 中井 新二1982 年 28 巻 3 号 p. 121-133
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーThe high resolution and good linearity of the readout system of the LaCoste & Romberg gravimeter justify both a better method for setting the beam position and a better measuring procedure than those described in the manufacturer's instruction manual. The effects of hysteresis following unclamping are reduced if the tilt angle in the direction of the long level is increased, so long as the beam remains horizontal. Moreover, the remaining effects are eliminated by our reading procedure. In this procedure, the output voltage corresponding to the beam position, with a dial setting which does not correspond to the null position, is recorded one minute after unclamping. The dial setting is then changed to bring the beam to the other side of null and the beam position voltage is again recorded one minute later. Finally, the dial is returned to its first position and, after one minute, the beam position is again recorded. The null dial setting can then be determined by interpolation. A new data processing system has been developed to implement the above procedure; this system can also be used for tidal observations. The analog signal from the beam position readout is digitized with an adjustable sampling interval. 101 consecutive digitized values are filtered using a digital low pass filter with trigonometric weights designed by Akaike; this filter has no phase lagg which is an advantage for recording the tides. Its purpose in both field and tidal measurements is to eliminate the effect of microseisms. The following features make the system suitable for field use :1) it is battery operated and has a digital printer.2) all the necessary computations are performed by a built-in microprocesser.3) the print-out includes the environmental factors of temperature, air pressure and level of background vibrational noise. For tidal observations, the system has a D/A converter so that the filtered output can be monitored with a chart recorder. Tests have shown the system to work well both for field gravity measurements and for tidal observations.抄録全体を表示PDF形式でダウンロード (4639K) -
大塚 成昭, 田村 良明, 藤森 邦夫, 田中 豊1982 年 28 巻 3 号 p. 134-151
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーIn order to investigate crustal movements of an active fault and its vicinity, continuous observations by many extensometers and tiltmeters have been going on at the Ootsuki Fault since 1970 except the interrupted period from 1972 to 1975. The Rokko-Tsurukabuto observation station is located at the Tsurukabuto Incline leading into the Rokko Tunnel of the Sanyo-Shinkansen of Japanese National Railways. Results of observation by six extensometers for the period from July 1977 to February 1980 are described in the present paper. It seems that observed curves are caused by secular change with linear trend, annual variation and the changes corresponding to the rainy season. Average strain rates during about 2.5 years show the large values of 1-10μ strain/year. The direction of principal axis of the secular strain rate at the north side of the fault is in WNWESE. It almost coincides with the direction of the regional tectonic stress inferred from some other researches. On the other hand, that at the south side is perpendicular to one at the north side. The features of annual variation and effects of the rainy season have much in common. Both the phenomena could be caused by the pressure changes of the ground water due to the precipitation. It is found that there are considerable differences between the north and south sides of the fault in all these phenomena. These analyzed results may suggest the characteristics of the crustal deformation in the vicinity of the fault.抄録全体を表示PDF形式でダウンロード (2916K) -
―算出された地殻歪の状況―中根 勝見, 藤井 陽一郎1982 年 28 巻 3 号 p. 152-161
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーThe characteristics of earth strain in the KANTO-TOKAI district calculated from the displacement vector are summarized as follows:1) The elongation with almost NNW-SSE direction is quite remarkable during for the coseismic earth strain of the 1923 KANTO earthquake.2) The principal axis of the postseismic compression is quite reverse as compared with the coseimic one.3) The principal axes of compression during the interseismic period are directed toward NW-SE in the TOKAI district, NNW-SSE in the KANTO district, and N-S in the BOSO peninsula.4) The maximum shear strain rates during the interseismic period are 2×10-7/yr. in the TOKAI district and 4×10-7/yr. in the KANTO district. In the KANTO district the calculated strain rate will be affected by the after effect of the 1923 KANTO earthquake.抄録全体を表示PDF形式でダウンロード (825K) -
―南極周辺のジオイド―瀬川 爾朗, 浅岡 達史1982 年 28 巻 3 号 p. 162-171
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリー海面高を±10cmの精度ではかったといわれるシーサツトのレーダ測高は,実際には衛星の軌道予測誤差のために±5m程度の測定誤差をもつ.本研究では,シーサット軌道上の多くの会合点における値のくいちがいの標準偏差を使って,軌道高度の修正を行なった.また,修正された海面高データから,南緯45。から南極大陸までの海洋ジオイドを求めた.えられた海洋ジオイドの相対的な精度は60cmである.抄録全体を表示PDF形式でダウンロード (1146K) -
塚本 博則, 中川 一郎, 東 敏博, 宮腰 潤一郎, 西田 良平, 西村 善博1982 年 28 巻 3 号 p. 172-173
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーGravity survey was carried out as densely and precisely as possible around Togo-ike, northwest Japan, in 1981.It was found that the area swarming with hot spring resources corresponds to the locally thick alluvium at Togo Spa.抄録全体を表示PDF形式でダウンロード (308K) -
中村 一明1982 年 28 巻 3 号 p. 174-176
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリー海のプレート運動のうち海溝軸に直交する成分はプレートの傾きをα度とすれば,沈降速度×sinα として求めうる.駿河トラフのように20度も傾いているところでは,沈降速度は年あたりcmの桁に達する.抄録全体を表示PDF形式でダウンロード (309K) -
萩原 幸男1982 年 28 巻 3 号 p. 177-178
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーThe vertical gradient of normal gravity usually taken as -0.3086 mgal/m everywhere on the earth's surface. This value is obtained on the assumption that the shape of the earth is sphere and its entire mass is concentrated on its gravity center. The rigorous expression of the vertical gradient of normal gravity can be obtained from the normal gravity potential. In this case, the mathematical formulation is made in the spheroidal coordinate system on the basis of the fact that the shape of the earth is approximately an ellipsoid of revolution. The obtained results indicate that the vertical gradient of normal gravity ranges from -0.3083 mgal/m (high latitudes) to -0.3088 mgal/m (low latitudes).抄録全体を表示PDF形式でダウンロード (202K) -
若杉 忠雄, 高橋 辰利1982 年 28 巻 3 号 p. 179-180
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーThe purpose of the observations is to clarify secular variation of ground tilt at the Ogi Peninsula, Sado Island. It is noticed for uplifting and northward tilting of the Ogi Peninsula at the time of the 1802 earthquake. Automatic level measurements indicate that the variation of ground tilt has been very small during the period from 1972 to 1982.抄録全体を表示PDF形式でダウンロード (205K) -
大久 保修平1982 年 28 巻 3 号 p. 181-182
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーPartial derivatives of Love numbers include Dirac's delta functions, which become infinite at the solid/liquid interfaces. 100% change in liquid density at the mantle-core boundary induces significant variations in Love numbers; 40% change in h2", 20% change in h2', 10% change in l2' and 7% change in k2'. Precise measurements of Love numbers pose a strong constraint on liquid density at the top of core. Taking 1% uncertainty in the liquid core density into account, we expect 0.1-1% uncertainty in Farrel's Green function.抄録全体を表示PDF形式でダウンロード (179K) -
中川 一郎1982 年 28 巻 3 号 p. 183-184
発行日: 1982年
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (265K)
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