巻号一覧
29 巻 (1983)
- 4 号 p. 201-
- 3 号 p. 141-
- 2 号 p. 83-
- 1 号 p. 1-
29 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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Hwa-Chu SHED, Hiroshi SATO, Yorimichi ARIMA, Seizo KAKISHITA1983 年 29 巻 1 号 p. 1-9
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーAfter the provisional research on the measurement of earthquake fault displacement in the Izu Peninsula by aero-triangulation, an experimental study for the accuracy and reliability of the method using aero-triangulation technique for the measurement of fault displacement instead of ground triangulation has been carried out in Tsugaru District. The result shows that relative fault displacements can be determined with the accuracy of ±10 cm when special ground marks are used and of ±20 cm when natural objects are used with the aero-photography of the scale of about 1:8, 000.抄録全体を表示PDF形式でダウンロード (940K) -
田中 寅夫, 細 善信, 和田 安男, 土居 光1983 年 29 巻 1 号 p. 10-18
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーA tendency that distances measured in the mornings are generally longer than those measured in the afternoons was found on the results from electro-optical distance surveys repeated every year since 1977 at the Kamitakara area in Central Japan. This indicates that similar meteorological circumstances which affect the surveys appeared every year in the same season and we may reduce the diurnal errors by performing surveys at fixed times on day in the same season. A simulation has been made to understand the relation between diurnal changes in the air temperature along lightpaths and the errors in the distances obtained by the usual meteorological correction using the air temperature and pressure at both ends of survey lines. By adopting an exponential decrease of the amplitude and the phase delay with height in the diurnal temperature change to be 90% and 4 hours per 100 m, respectively, the observed diurnal changes in the results at Kamitakara are well explained and corrections in respect of survey times reduce successfully the scatter in the survey data and increase their reliability.抄録全体を表示PDF形式でダウンロード (2857K) -
友田 好文, 内山 昭憲, 内藤 好裕, 大蔵 康浩, 長山 岡久, 高橋 良昌1983 年 29 巻 1 号 p. 19-27
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリー海底において使用する三成分磁力計をMfrたに製作した.互いに直交するようにおかれた3つのフラックスゲートセソサーを使用し,定磁界補償は,マイクロプロセッサーを用いて数値的に制御される. フラックスゲートセソサーの出力はA-D変換されRAMに書きこまれ,RAMの内容は24時間毎に磁気バブルメモリーに転送される。160KBのバブルメモリーを使用することにより,標本間隔2.5分のとき,90日分のデータを蓄えることができる. 相模湾海底1500mでの試験観測において約1ヶ月間に互る満足できる記録をとることができた.抄録全体を表示PDF形式でダウンロード (3175K) -
石川 甲子男1983 年 29 巻 1 号 p. 28-36
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーA method of the least squares is modified to apply it to the case that data are time dependent. In the formalization the observation equations are function of the time and the expectations are obtained at arbitary time. This modified method is named the method of the dynamic least squares (D.L.S.) and it is applied to the adjustment of the geodetic survey.抄録全体を表示PDF形式でダウンロード (555K) -
―伊豆半島およびその周辺における地殻歪速度と最近の地震活動―藤井 陽一郎, 中根 勝見1983 年 29 巻 1 号 p. 37-47
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーSome remarkable earthquakes have occurred since 1974 till now in and around the Izu peninsula, Japan. These are the 1974 Izu-Hanto-Oki earthquake (M6.9), the 1976 Kawazu earthquake (M5.4), the 1978 Izu-Oshima-Kinkai earthquake (M7.0), and the 1980 Izu-Hanto-Toho-Oki earthquake (M6.7). Also these earthquakes took their places within the area where very high crustal strain rates ranging from 6 × 10-7/yr to 14×10-7/yr are geodetically deduced. It seems that seismic activities migrate along the east coast of the peninsula from the southern tip to the northeastern part, where some remarkable contemporary crustal strain rates are also found. Accumulated strains in the . noticed area have arrived at order of 50 × 10-6 that exceeds ultimate strain level estimated by Rikitake (1975) since occurrence of the 1923 Kanto earthquake till now. While strain rates in the northeasternpart of the peninsula were very large just after the 1923 Kanto earthquake and decreased gradually, high strain rate of 9.8×10-7/yr is detected in the triangle Sengenyama-Ishibashimura-Hatsushima in the noticed area. This triangle locates very close to the Nishi-Sagami-Bay fault where Ishibashi (1977) estimated a possibility of an earthquake with magnitude 7 class in near future. Therefore it is very important to follow and watch the crustal activities in the pointed area.抄録全体を表示PDF形式でダウンロード (1124K) -
―ラコスト重力計(G型)定数の精密検定と国際重力基準網1971の精度―中川 一郎, 中井 新二, 志知 龍一, 田島 広一, 井筒屋 貞勝, 河野 芳輝, 東 敏博, 藤本 博巳, 村上 亮, 太島 和雄, 船 ...1983 年 29 巻 1 号 p. 48-63
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーInternational gravimetric connections were carried out by means of 8 and 7 LaCoste & Romberg gravimeters (model G) at selected cities along the west and east sides of the Circum-Pacific zone in 1980 and 1981, respectively, and both sides were connected by Tokyo (Japan) and Santiago (Chile). A branched connection was extended from Christchurch (New Zealand) to McMurdo Sound (Antarctica) by means of 2 of the 8 gravimeters in 1980. Preliminary and additional connections were also carried out with 2 LaCoste & Romberg gravimeters (model G) to experience actual measuring environments and to directly link Tokyo with Santiago as rapidly as possible in 1979 and 1982, respectively. The maximum gravity difference in the present connections amounted to about 6.1 gals (=6.1 × 10-2 ms-2) . The purpose of these connections was to make a precise calibration of scale values of the gravimeters employed, to establish an up-to-date gravity net which is capable of detecting the time change of gravity along the Circum-Pacific zone, and to obtain data for the updating of the International Gravity Standardization Net 1971 (IGSN 71) in this annn The international gravimetric connections were executed among 34 cities mainly along the Circum-Pacific zone. In 25 among the 34 cities, local gravity measurements were made at 3 to 9 measuring stations. The total number of the measuring stations occupied was 187 of which 19 were temporary stations. After the data obtained were adjusted, a correction function for the scale value of each gravimeter given by the manufacturer was precisely determined as a function of counter value of the gravimeter. By applying the correction function thus obtained, the gravity value at each gravity station was recalculated and compared with either the corresponding value given on the IGSN 71 or the value determined by an absolute gravity measurement. The accuracy of the present international gravimetric connections was estimated to be better than f 0.03 mgals, and it was revealed that the gravity values at some stations given on the IGSN 71 seemed to involve some systematic errors with an order of 0.1 mgals.抄録全体を表示PDF形式でダウンロード (1531K) -
―ラコスト重力計(G型)の感度特性と測定誤差―中川 一郎, 中井 新二, 志知 龍一, 田島 広一, 井筒屋 貞勝, 河野 芳輝, 東 敏博, 藤本 博巳, 村上 亮, 太島 和雄, 船 ...1983 年 29 巻 1 号 p. 64-75
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリーInternational gravimetric connections were carried out by means of several LaCoste & Romberg gravimeters (model G) at selected cities mainly along the Circum-Pacificzone from 1979 to 1982. This article deals with a measuring error caused by the setting error of the LaCoste & Romberg gravimeter to evaluate an accuracy of gravity measurements performed throughout the present investigations. It was found through the early stage of the investigations that a mechanical sensitivity of the gravimeter was significantly changed with correlated to mean air temperature in each city. A critical examination on this problem was made in the late stage of the investigations. The result of the examination revealed that the sensitivity change was brought from a characteristic common to the LaCoste & Romberg gravimeter by which an optimal offset angle of the gravimeter at the time of gravity measurements depends on gravity value at each measuring station. This characteristic of the gravimeter can be explained by the relative change of hinge positions in the spring system and does not affect any measuring accuracy. The setting error of the gravimeter at each gravity measurement, that was represented by the discrepancy between a setting angle and the optimal angle in offset angle, was determined by arranging both data of sensitivity measurements made at each measuring station and those of calibration results obtained at several stations. It was confirmed that the measuring error caused by the setting error of the gravimeter was small; namely, less than 0.01 mgals usually and 0.02 mgals at maximum throughout the whole period of the investigations.抄録全体を表示PDF形式でダウンロード (1190K) -
佐々木 稔1983 年 29 巻 1 号 p. 76-77
発行日: 1983/06/10
公開日: 2010/09/07
ジャーナル フリー
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