超伝導重力計を用いた南極・昭和基地における1年間の重力連続観測
書誌事項
- タイトル別名
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- One Year Observations with a Superconducting Gravimeter at Syowa Station, Antarctica.
抄録
Since March 22 of 1993, observations of Earth tides and Earth's free oscillations with a superconducting gravimeter (SCG) were continuing at Syowa Station, Antarctica (69.0°S, 39.5°E). Combined with the other SCG data from the global network, we expect to detect signals related with a fluid core resonance, core undertones in the fluid core, the Slichter mode of the inner core, etc. and to elucidate nature of long-period tides. Parallel observations were also continuing using a LaCoste & Romberg D gravimeter which was equipped with an electrostatic feedback amplifier and the same analog filter that were used in the SCG observations. Preliminary analyses of 1 year tidal data (March 22, 1993-March 21, 1994) generally support the previously obtained diurnal and semidiurnal tidal gravimetric factors, and confirm 10% larger M2 5 factor than the theoretical value by Dehant-Wahr. Subtraction of both short- and long-period tides from the original signals resulted in a fairly small (0.06 ugal/day: 1 μgal=10-8 m/s2) trends including instrumental drift. An rms noise level of the data obtained through the MODE filter (MODE data) is estimated typically as 5-20 ugal (1 μgal=10-11 m/s2). The recorded MODE data include high quality free oscillation signals from the Hokkaido-Nansei-Oki Earthquake (Ms =8.2) on July 12, and the earthquake of South of Mariana Island (Ms=8.2) on August 8, 1993.
収録刊行物
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- 測地学会誌
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測地学会誌 41 (1), 75-89, 1995
日本測地学会
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詳細情報 詳細情報について
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- CRID
- 1390282679043193600
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- NII論文ID
- 130004189641
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- ISSN
- 2185517X
- 00380830
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可