巻号一覧
49 巻 (2003)
- 4 号 p. 215-
- 3 号 p. 159-
- 2 号 p. 99-
- 1 号 p. 1-
49 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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竹本 修三, 百瀬 秀夫, 藤森 邦夫, 東 敏博2003 年 49 巻 4 号 p. 215-225
発行日: 2003/12/25
公開日: 2010/09/07
ジャーナル フリーA laser extensometer was installed in a shallow observation room at Kwasan Astronomical Observatory, Graduate School of Science, Kyoto University in 1999. Since then, we have carried on precise observation of crustal strains with the laser extensometer. The purpose of this paper is to estimate the effect of meteorological changes (e.g. ambient temperature change, atmospheric pressure change, etc.) upon observation of crustal strains using a laser extensometer installed in a shallow tunnel. Results obtained are as follows; (1) Before closing the vacuum valve of the stainless steel pipe covering the light path of the laser interferometer, the strain data obtained from the laser extensometer showed significant influence of the atmospheric pressure change of 2.6×10-7/hPa. This can be explained by the refractive index change in the light path caused by atmospheric pressure change. (2) After evacuating the air in the light path and closing the vacuum valve, long-term strain changes corresponding to ambient temperature changes were observed in the order of 1×10-5/K. These changes can be fully explained by the thermal expansion coefficient of bedrock around the observation room, because linear thermal expansion of bedrock consisting of weathered granite is estimated to be (0.4-1.0)×10-5/K. (3) We then performed tidal analysis by applying FFT and BAYTAPG programs to one-year strain data obtained from the laser extensometer. As a result, there exist significant discrepancies between the observed and the calculated tidal amplitudes. The discrepancy is caused by non-sinusoidal daily temperature changes around the observation site due to sunshine from the east direction in the morning.抄録全体を表示PDF形式でダウンロード (2368K) -
廣瀬 一聖, 川崎 一朗, 竹本 修三, 田村 良明2003 年 49 巻 4 号 p. 227-242
発行日: 2003/12/25
公開日: 2010/09/07
ジャーナル フリーWe search for temporal variations of principal tidal constituents in strainmeter records, for instruments which are closely located to the source regions of large earthquakes in Japan. To obtain temporal variations, we apply the BAYTAP-G (Bayesian Tidal Analysis Program- Grouping Model) to data sets of 30 day lengths with time lags of 1 day. For the 01 constituent of the laser strainmeter record at the Rokko-Takao station, characteristic changes are observed in its amplitude-phase diagram a few years prior to the 1995 Kobe Earthquake (Mw6.9). Although the observed values are narrowly distributed in the amplitude-phase diagram before 1992, they become broader and a doughnut-pattern appears prior to the occurrence of the earthquake. For the case of the 1994 Far Off Sanriku Earthquake (Mw7.7), the same pattern is also noted at the Esashi station. There are no similar significant patterns in the M 2 constituent. Temporal correlation with the changes of b-values and micro-earthquake seismicity are also suggeste.抄録全体を表示PDF形式でダウンロード (1703K) -
Joseph L. Awange, 福田 洋一, 竹本 修三, Erik W Grafarend2003 年 49 巻 4 号 p. 243-256
発行日: 2003/12/25
公開日: 2011/07/05
ジャーナル フリー写真測量,あるいはコンピュータ画像処理において欠かせない3次元の3重交点問題に,終結式を応用した解法を開発した。水平方位観測T1ならびに垂直方位観測Bi(i=1,2,3)における3つの非線形方程式が,Strumfelの終結式を用いることで3つの4次多項式に分解でき,それがMATLABを用いて計算できることを示した。この方法の利点は,最低数,すなわち3つの既知点のみから,交点法を用いて求点の座標を得ることが出来る点で,例えば写真測量において,限られた既知点から通過点の座標を求める問題に応用可能である。抄録全体を表示PDF形式でダウンロード (1210K) -
田島 稔2003 年 49 巻 4 号 p. 257-263
発行日: 2003/12/25
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (925K) -
萩原 幸男2003 年 49 巻 4 号 p. 265-268
発行日: 2003/12/25
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (622K) -
竹本 修三, 辻 宏道, 福田 洋一, 黒石 裕樹, 徐 培亮, 田村 良明, 佐藤 忠弘, 吉野 泰造, 日置 幸介, 藤本 博巳, 大坪 ...2003 年 49 巻 4 号 p. 269-287
発行日: 2003/12/25
公開日: 2010/09/07
ジャーナル フリーPDF形式でダウンロード (2703K)
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