巻号一覧
50 巻 (2004)
- 4 号 p. 245-
- 3 号 p. 187-
- 2 号 p. 53-
- 1 号 p. 1-
50 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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松本 晃治2004 年 50 巻 3 号 p. 187-200
発行日: 2004/09/25
公開日: 2010/09/07
ジャーナル フリーIn order to reduce the tidal errors in the shallow water region, we established a global ocean tide model (NAO.99b) representing major 16 constituents with a spatial resolution of 0.5°. The key feature of this model is a fine-scale along-track tidal analysis of the TOPEX/POSEIDON data, the results of which are assimilated into a barotropic hydrodynamical model which account for the self-attraction and the loading effect accurately. Also we developed a high-resolution (1/12°) regional ocean tide model around Japan (NAO.99Jb) by assimilating both the TOPEX/POSEIDON data and the data of 219 coastal tide gauges. These models with a computer code for tidal loading calculation have been freely distributed via a web site to whomever interested including eodesits and ocennogrnnhers.抄録全体を表示PDF形式でダウンロード (4296K) -
関口 直甫2004 年 50 巻 3 号 p. 201-207
発行日: 2004/09/25
公開日: 2010/09/07
ジャーナル フリーAround 1999, the Anomalous Behavior of the Polar Wobble (ABPW) again took place. This is the third ABPW observed by astronomical means following after 1845 and 1927, and its first example where the phase of the Chandlerian motion was retarded from the rate of the ordinary polar wobble.抄録全体を表示PDF形式でダウンロード (695K) -
小林 昭夫, 吉田 明夫2004 年 50 巻 3 号 p. 209-212
発行日: 2004/09/25
公開日: 2011/07/05
ジャーナル フリーWe report that tide gauge records at Maisaka, situated near Lake Hamana in the south coast of Tokai area, show upheaval of the land due to the Tokai slow slip that has started in the fall of 2000. Lowering of the sea level is also seen in the records during the periods of 1980-1982 and 1988-1990. Wethink it is very probable that a slow slip occurred in the period of 1988-1990, because there are some other evidences to support the conjecture: (1) Achange similar to that in recent years was observed by the tiltmeter at Mikkabi on the northwestern shore of Lake Hamana, (2) the spatial pattern of vertical movement in the period of 1988-1990 deduced from leveling measurements was similar to that in recent years, and (3) the seismic activity in the slab near Lake Hamana decreased conspicuously in both periods of 1988-1990 and since 2000. As for the change in the period of 1980-1982, it is possible that it might be caused by a slow slip. However, we cannot say that with confidence for the present because ob servations at that time were not enough compared to the later periods.抄録全体を表示PDF形式でダウンロード (1951K) -
坂田 正治2004 年 50 巻 3 号 p. 213-226
発行日: 2004/09/25
公開日: 2010/09/07
ジャーナル フリーThe Sakata-type three-component strainmeter, invented and developed by the author, is expected to serve as a long-period strain seismograph as well as a research tool for short-term earthquake prediction, since detection of co-seismic strain steps has confirmed a quantitative reliability of the instrument as a three-component borehole strainmeter. The strainmeter measures the change in area of three separate chambers composing the underground sensing part. Three components of strain, two principal strains and their azimuth, are derived from the observed three values. Since this method of strain measurement is new and different from the conventional one based on the changes in three separate distances, it is important to make the principle of operation well understood to avoid confusion. In this report the basic equations, presented separately in several papers by the author, are gathered and arranged in a uniform manner. A major portion of this is concerned with the case where chamber partitions are assumed to be free from any resistive forces. Although this case is fictional the results will help us to understand the actual case where partitions have finite rigidity, and an approximate method of solution is presented. The basic theory of the three-component strainmeter based on the method of measuring three diameter changes is also given in the appendix for comparison.抄録全体を表示PDF形式でダウンロード (2055K)
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