著者

飯田 汲事 志知 竜一 松浦 宏

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.14, no.4, pp.144-155, 1969-09-30 (Released:2011-07-05)

参考文献数

7

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After the installation of the instruments: Water-tube Tiltmeter; Ishimoto silica clinograph; silica extensometer, at Inuyama Crustal Movement Observatory in 1966, the continuous observation of crustal deformation has been carried out. This report is the results of 14 months- observation. It was found that the maximum principal strain was 0.6×10-6 in extension and 0.5×10-6 in contruction; areal dilatation was -0.2- +0.6×10-6 and maximum shearing strain was 1.6×10-6. The changes in inclination was also found to be in the order of 1.8×10-6 rad. The direction of extension of the principal strain seems to be corresponding to the geologic structure in Inuyama district. The change in areal dilatation has a reciprocal to that of the maximum shearing strain . The noise accompaning precipitation is comparatively large compared with the secular change in crustal deformation. However, the foundamental clue to the removal of this noise effect on crustal deformation was obtained. The mechanism of this noise appearance is presumably understood by considering the geologic structure in this area.

著者

高木 菊三郎

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.4, no.2, pp.59-61, 1957-12-15 (Released:2010-09-07)

著者

中粮 勝見 ハンガイ ニャポーラ

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.31, no.3, pp.283-284, 1985

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1949年かち1973年にかけて測量されたケニアの1等水準網のうち,リフトパレーをまたぐ環の閉合差が非常に大きい.著者らは,この閉合差は測量誤差だけに起因するのでなく,リフトバレーの地殼変動にも起因するものと考え,水準点の変動量を未知量として網平均した.その結果は,リフトパレーの谷底は年間数cm沈下していることを示している.

著者

長沢 工

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.19, no.4, pp.179-189, 1974-03-25 (Released:2011-07-05)

参考文献数

13

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It is often said that the occurrence of earthquake is affected by the moon or the sun. Various researches have been made on this problem, their relation however remains doubtful. In this paper, statistical correlations between the earthquake frequency and positions of moon and the sun are treated by using 8176 earthquakes in and near Japan. The author considers nine variables about the position of the moon or the sun, namely hour angles, azimuths and zenith distances of the moon and the sun at the epicenter, moreover, distance, time derivative of distance and phase of the moon . These values are precisely computed for the occurrence time of earthquakes and the correlations to earthquakes are investigated. Characteristic results thus obtained are as follows . 1) About the relation to the phase of the moon. During the time around the first and the last quarters of the moon, earth quake frequency increased distinctly about 15% above on average level, which is far beyond the limit of statistical fluctuation. For earthquakes of magnitude over 6, the increase reaches to 30% or more. 2) About the relation to the hour angle of the moon . Earthquake frequency changes systematically according to the hour angle of the moon for earthquakes of magnitude over 6 . Its maximum occurs near the time of moon's hour angle 90° and 300°.……………… From these results descrived above, the author suspects that the moon has influence on the occurrence of earthquake if it is difficult to connect directly the tidal force of the moon with the occurrence of earthquake.

著者

坪川 家恒

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.19, no.2, pp.116-119, 1973

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Scholz et al, explained precursory phenomena and their durations before earthquakes by dilatancy of the crust, and proposed the relation between the duration period and the magnitude of the earthquake expected which is quite near to the relation proposed by the writer in 1969. The writer also points out the duration period due to dilatancy must be shortened for an earthquake larger than M7, 0 and disappears larger than about M7, 7.

著者

角田 忠一

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.29, no.4, pp.223-235, 1983

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水沢,東京およびIrkutskにおける時刻および緯度の光学観測結果を利用し,東南アジアプレートの変形をしらべた.水沢および東京の時刻観測値とIrkutskの時刻観測値の差から約1msecの経度変化が見られた.この経度変化は地球自転速度変化との相互作用を示唆している.剛体マントルとプレートの粘性結合模型によりこの相互作用を説明することが可能である.

著者

萩原 幸男

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.30, no.2, pp.92-106, 1984-08-25 (Released:2010-09-07)

参考文献数

6

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Suppose an arbitrary function expressed in a surface spherical harmonic expansion series when the pole is translocated at an arbitrary point on the surface of a sphere. The coefficients of the expansion series are functions of the latitude and longitude of the translocated pole. GANEKO [6] has derived the general transformation formula of spherical harmonic expansion coefficients in a form of the modified Jacobi polynomials. It can be applied to theoretical problems of geodesy and geophysics including the translocation of the polar axis. This paper shows a simple method for deriving GANEKO's transformation formula and its inverse one, with their applications to the global geoidal height.

著者

平岡 喜文 横川 正憲 根本 盛行 村山 盛行 武山 峰典

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.57, no.4, pp.173-180, 2010 (Released:2012-03-30)

参考文献数

5

---

We developed a new Remote GPS Monitoring System (REGMOS) -Hybrid which utilized the Broadband Global Area Network (BGAN) of Inmarsat PLC and solar cell modules for data transfer and power supply, respectively. It can equip many kinds of sensors including GPS, camera, thermometer, tiltmeter and so on to monitor volcanoes and crustal activities. The original REGMOS was first developed in 1998. The purpose of the development is to monitor crustal deformation in a severe environment where infrastructures including electric power and wired telephone line is not available, for example, a volcanic field and an area damaged by an earthquake. In the original system, the data transfer using satellite telephone services is unstable and slow (4.8 kbps) and GPS is an only sensor for crustal monitoring. It was pointed out that various kinds of data such a photo of a crater were important to monitor volcanic activities. Therefore, we developed the new REGMOS-Hybrid to overcome the problems of the data communication and power generation in the original system. We installed the REGMOS-Hybrid on the summit of Mt. Tarumae volcano in Hokkaido in August 2010. It has enabled us to monitor the volcanic activity for more than one year without any troubles of the whole system. The other kinds of data including a movie and geomagnetism have been already supported by the REGMOS-Hybrid. We plan to acquire these data in a practical field.

著者

岩田 隆浩 南野 浩之 佐々木 健 小川 美奈 並木 則行 花田 英夫 野田 寛大 松本 晃治 今村 剛 石原 吉明 鶴田 誠逸 浅利 一善 劉 慶会 菊池 冬彦 Goossens Sander 石川 利昭 河野 宣之 高野 忠

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.55, no.2, pp.135-150, 2009 (Released:2012-03-28)

参考文献数

16

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SELENE Main Orbiter (KAGUYA) has separated two small sub-satellites; (1) the Relay Satellite “OKINA (Rstar)”, and (2) the VLBI Radio Satellite “OUNA (Vstar)”. These sub-satellites started to perform 4-way Doppler measurements using Relay Satellite Transponder (RSAT) and multi-frequency phase-delay differential VLBI using VLBI Radio Sources (VRAD) for lunar gravity mapping. We have developed the frequency conversion system, multi frequency S/X-band vertical dipole antenna, and light weighted S-band patch antenna to perform these missions. Simple structured release mechanism has also been developed and confirmed its performance by ground test and orbital demonstration using micro-Lab Sat. Initial check out were executed and properties of satellite bus equipments, onboard mission instruments, and observation systems including ground stations were evaluated. Electric power and thermal control subsystems have shown that they conduct as designed and inspected in the ground tests. The release mechanisms have given the spin which can maintain the stability of the satellite attitudes. Communication functions of mission instruments conform to the link budgets. These results suggest that OKINA and OUNA have enough performances to produce efficient data by RSAT/VRAD gravity observations.

著者

上谷 良吉

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.6, no.3, 1960-12

著者

藤原 了 橋本 学 竹本 修三

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.47, no.2, pp.659-678, 2001-06-25 (Released:2011-03-01)

参考文献数

44

被引用文献数

1

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三次元有限要素法を用いて琉球弧をモデル化し,粘性流体媒質中の定常流の仮定下で流れ及び応力場を計算した.背弧直下に想定される低密度媒質及び一般的なプレート運動の原動力の背弧拡大に対する効果,地殻粘性率の影響について考察した.解析の結果,スラブ引っ張り力やリッジプッシュ等のみを考慮したモデルでは背弧地域に圧縮場を形成した.一方,背弧直下での低密度媒質に働く浮力を考慮した場合,背弧における拡大を示唆する張力場が得られた.背弧直下の低密度媒質は地殻付近の深さまで到達している可能性が高く背弧拡大の主原動力と考えられる.さらにマントルの粘性率と背弧領域の地殻粘性率との差が小さい時,すなわち相対的に軟らかいプレートを仮定した時に拡大が生じた.

著者

瀬戸 孝夫 田中 穣 田島 稔

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.16, no.1-2, pp.34-39, 1970-08-25 (Released:2011-07-05)

参考文献数

14

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Observations of magnetic variations were made by means of portable fluxgate type magnetometers at Akagane (cp = 39°10:6 N, λ =141°20:6 E), Ishibuchi (ψ = 39°06:7 N, A = 140°54:6 E), Yuzawa (ψ = 39°10:2 N, A = 140°29:8 E) and the Mizusawa Geodetic Observa-tory (ψ = 39°06:5 N, A = 141°12:4 E) for the purpose of studying the conductivity anomaly along the east-west line including the Observatory in the Tohoku district of Japan. Using the observed events having the duration time longer than 30 minutes, the ele-ments of Parkinson Vector at four stations are obtained as shown in Table, whose direc-tions are eastward and opposite from those obtained by using the data of geomagnetic micropulsations having the periods of 10-60 seconds. A brief discussion was made about the relation between the conductivity anomaly and the crust and upper mantle structure in the Tohoku district which has typical geo-physical characteristics among circum-pacific island arcs.

著者

藤田 尚美 間所 啓一郎

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.14, no.4, pp.125-131, 1969

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月平均潮位の解析に修正差方式― ある海域内で,二つの検潮所の月平均潮位の差をとり,年周変化を消去する方法―を導入した.修正差の方式を用いると,単純差の場合に比して,2検潮所の月平均潮位の差の不規則性はかなり減小する.その標準偏差は,約15mmと考えられる. 新潟地震については,1)新潟地震前の月平均潮位の差には,1959年のわずかな経年変化の変動を除いて,異常変動は認めにくい.2)柏崎を基準として,地震の際の地殻の上下変動として岩崎は動かず,鼠ケ関は約20cm下がり,輪島は2~3cm下がつたように見える.3)鼠ケ関-柏崎の月平均潮位の差の経年変化は,地震前後で変化したように見える.このような例は,南海道地震の際,紀伊半島南端の串本検潮所の潮位変動にもみられる. 1968年十勝沖地震については,1)小名浜を基準にして,八戸,宮古の地盤は数cm下がつたようである.2)小名浜を基準にして,八戸,宮古検潮所の1966年の異常変化は海象による可能性がある.

著者

田中 豊

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.31, no.1, pp.73-85, 1985

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地震予知の基礎的研究として,1978年以来大学,国立防災科学技術センター,地質調査所は,応力解放法,水圧破壊法,その他新開発された方法により応力測定を実施してきた.1984年中期までには地下開発設計や地熱開発計画に際し実施された測定を含めて50余地点の測定結果が報告された. これらの測定成果を概括し,方法,條件,地域を異にする測定値を比較し,現時点での応力測定の有意性を検討しておく必要がある.理論的厳密な補正は今後の研究を待つこととし,比較のため簡便なデータ処理を施し,応力測定成果を概観することにした. 1)水平最大応力方向は平均的にはテクトニツクな応力状態を十分反映していると思われる. 2)応力深度勾配は各地でそれぞれ異なる.応力解放法では限定地域内で西日本の標準応力深度勾配を求め,これと水圧破壊法による勾配と比較した.平均水平応力,水平せん断応力に関しては,西日本の深度勾配は水圧破壊法により東日本各地で得られた値のほぼ平均を示し,深度勾配の比較は,地下の応力状態を推定し,応力区を類別するために有用と思われる.3)応力深度勾配を用い,各深度の測定値を標準深度(今回300m)の応力値に換算し,水平主応力の地域分布図を画いた.これは応力区の広がり7活断層との関連,局地的異常など壷調べる上で有効と思われる.4)極浅発地震の発震機構から中間主応力軸は必ずしも鉛直ではないことが知られている.上部地殻の応力状態を明解に.示すたあ,3次元応力測定で得られた最大せん断応力面をステレオ投影した.これは地形影響の判定と同時に,活断層地域の局所的応力状態の推定にも役立つ. 以上のように各種の応力測定は十分地震予知の基礎研究として成果をあげつつあるが,応力変化を求めるにはまだ精度が不足であり精度向上と同時に,各種條件下の多数の測定資料がなお必要である.

著者

許 華杞 恒石 幸正

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.42, no.2, pp.111-113, 1996

著者

溝上 恵

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.8, no.1, pp.29-37, 1962-12-30 (Released:2010-09-07)

参考文献数

5

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It is the well known fact that notable relations exist between the distribution of Bouguer gravity anomalies and the structural units of the surface geology in Hokkaido, which have been formed by the orogenic movements since the Miocene period. For example, the Hidaka mountains which have been violently upheaved in the most recent geologic age, are areas of remarkably high gravity while the Tempoku-Urakawa Zone which have rapidly subsided in the same age is the area of strong negative anomalies running parallel to the mountains. In this paper, it is shown that the pattern of the strong negative anomalies of the Tempoku-Urakawa Zone can be explained by Vening Meinesz's theory of visco-elastic deformation of the crust by compressive stress. Time required for the deformation of the crust and density of sedimentary layer was also calculated and these results are in good harmony with the geohistorical evidence in this region.

著者

花田 英夫 岩田 隆浩 菊池 冬彦 劉 慶会 松本 晃治 浅利 一善 石川 利昭 石原 吉明 野田 寛大 鶴田 誠逸 Petrova Natalia Goossens Sander 原田 雄司 佐々木 晶 並木 則行 河野 裕介 岩館 健三郎 亀谷 收 寺家 孝明 柴田 克典 田村 良明 矢作 行弘 増井 亘 田中 孝治 前島 弘則 洪 暁瑜 平 勁松 艾力 玉〓甫 Ellingsen Simon Schlüter Wolfgang

出版者

The Geodetic Society of Japan

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.55, no.2, pp.203-221, 2009-07-25

被引用文献数

5

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The Japanese lunar explorer SELENE (KAGUYA), which has been launched on Sep. 14th, 2007, utilizes VLBI observations in lunar gravimetry investigations. This can particularly improve the accuracy of the low degree gravitational harmonics. Combination of ground based VLBI observations and Doppler measurements of the spacecrafts enable three dimensional orbit determinations and it can improve the knowledge of the gravity field near the limb. Differential VLBI Radio sources called VRAD experiment involves two on-board sub-satellites, Rstar (Okina) and Vstar (Ouna). These will be observed using differential VLBI to measure the trajectories of the satellites with the Japanese network named VERA (VLBI Exploration of Radio Astrometry) and an international VLBI network.<BR>Two new techniques, a multi-frequency VLBI method and the same-beam VLBI method, are used to precisely measure the angular distance between the two sub-satellite radio sources Okina and Ouna. The observations are at three frequencies in S-band, 2212, 2218 and 2287 MHz, and one in X-band, 8456 MHz. We have succeeded in making VLBI observations of Okina/Ouna with VERA and the international network, and have also succeeded in correlating of signals from Okina/Ouna, and obtained phase delays with an accuracy of several pico-seconds in S-band.

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.19, no.4, pp.244-244, 1974-03-25 (Released:2011-03-01)

出版者

日本測地学会

巻号頁・発行日

1954

著者

小林 裕太 日置 幸介

出版者

日本測地学会

雑誌

測地学会誌 (ISSN:00380830)

巻号頁・発行日

vol.58, no.2, pp.89-93, 2012-10-25

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The Earth's spin axis moves by various factors, and mass redistribution associated with seismic faulting is also expected to contribute to this movement. However, there have been no space geodetic observations of coseismic polar motion excitations to date. In this study, we analyze the time series of the excitation functions of the polar motion, and try to detect steps due to the three recent M9 class earthquakes, i.e. the 2004 Sumatra-Andaman, the 2010 Chile (Maule), and the 2011 Tohoku-Oki earthquakes. For the 2010 Chile earthquake, a significant step was detected but was not consistent with the anticipated direction.