巻号一覧
50 巻 (2004)
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50 巻, 1 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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徐 培亮2004 年 50 巻 1 号 p. 1-15
発行日: 2004/03/25
公開日: 2010/09/07
ジャーナル フリー本稿では地球科学への応用ができるランダムテンンルについての研究を紹介する.具体的には以下の通りである:(1)ランダム的な歪みと応力テンソルの厳密な確率分布につさいて;(2)ランダム的なスペクトルの偏りについて;(3)高次項を含めるランダム的なスペクトルの精度評価について;そして,(4)その地球科学への応用と可能な応用について.抄録全体を表示PDF形式でダウンロード (1507K) -
小林 佑輝, 岩野 祥子, 福田 洋一2004 年 50 巻 1 号 p. 17-26
発行日: 2004/03/25
公開日: 2011/03/01
ジャーナル フリーIn order to improve the accuracy of the estimated oceanic tidal loading effects at Syowa Station, and some of bared areas along Lutzow-holm Bay, Antarctica, we made a detailed coastline data set. The coastline data, grid size of which corresponds to so-called 4 th mesh (1.5"×2.25"grids) of the GOTIC2 software, are read from 1/25, 000 scale maps around Syowa Station over a 1.5 degrees by 1.5 degrees area. Using this data set and the NA0 .99b ocean tide model, we calculated oceanic tidal effects for gravity (GV), radial displacement (RD), and horizontal displacement (HD) at Syowa Station and nearby areas . At Syowa Station, obtained amplitudes and phases of M2, S2, 01, and K1 waves for GV are (2.302, iGa1, 351.38 deg.), (1.585μGal, 1.39 deg.), (2.504μGal, 349.14 deg.) and (1.953μGal, 352.33 deg.), respectively. The amplitude of RD and HD at Syowa Station are 56 mm and 14 mm, respectively, while the rela tive amplitudes of RD and HD between Syowa Station and Skalen, one of the GPS observation sites at the bared areas, are 8 mm and 1.3 mm, respectively. Newly estimated gravity effects will allow us to get accurate tidal admittance for the superconducting gravimeter observa tions at Syowa Station. The result also shows that the oceanic tidal effects on VLBI and/or GPS observations are not negligible, if the observation points are near the sea .抄録全体を表示PDF形式でダウンロード (4423K) -
飛田 幹男, 宗包 浩志, 海津 優, 松坂 茂, 黒石 裕樹, 眞暗 良光, 加藤 敏2004 年 50 巻 1 号 p. 27-37
発行日: 2004/03/25
公開日: 2010/09/07
ジャーナル フリーThe source of seasonal groundwater level variation, which is closely related to the variation of GPS vertical component, was investigated. We found that groundwater pumping for paddy field irrigation from May to August caused drawdown of groundwater level by 7m and this caused temporal subsidence by about 2 cm in Geographical Survey Institute, Tsukuba. Elastic deformation of gravel layers explains the process that groundwater level variation causes variation of ground height, because the height recovers completely and there is no delay between the two variations. The scale error of GEONET due to the seasonal height variation of the fixed GPS station at GSI is estimated to be±0.3 ppb.抄録全体を表示PDF形式でダウンロード (3383K) -
小林 昭夫, 吉田 明夫2004 年 50 巻 1 号 p. 39-42
発行日: 2004/03/25
公開日: 2010/09/07
ジャーナル フリーWe investigated crustal deformation after the 1946 Nankai earthquake using tide gauge records. Although resolution of tide gauge records is not so high for seeing the temporal change in detail, vertical crustal movements whose relaxation times are between several months to years can be detected by them. It was reported that there had been a postseismic crustal deformation with a time constant of 4-5 months in southern Kui Peninsula (Kobayashi et al., 2002). In this paper we show that crustal deformations with a longer relaxation time of a few years were observed in northern Shikoku, examining tide gauge records at such stations as Takamatsu, Sumoto and Kobe. These observations suggest that there was a time lag in the development of postseismic slip between shallow and deeper parts on the plate interface after the Nankai earthquake.抄録全体を表示PDF形式でダウンロード (561K) -
―御前崎地方の精密水準と比較して―呉 新華, 西 修二郎, 今給黎 哲郎, 田中 穣2004 年 50 巻 1 号 p. 43-46
発行日: 2004/03/25
公開日: 2011/07/05
ジャーナル フリーGPS continuous observation and repeated pre cise leveling between Kakegawa and Omaezaki, Tokai area, Japan, have been carried out by the Geographical Survey Institute for detecting verti cal deformation and identifying its noise charac teristics. Comparing relative height differences obtained from two different observations with each other, it is made clear that the annual change in leveling result is in phase with that of zenith analysis, but the amplitude of the former is twice larger than that of tropospheric ZTD. In contrast, it is found out that the linear subsidence rate given by GPS is a little larger than that from leveling.抄録全体を表示PDF形式でダウンロード (2684K) -
2004 年 50 巻 1 号 p. 47-48
発行日: 2004年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (223K)
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