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- Yamada Takeshi
- Department of Earth and Planetary Systems Science, Faculty of Science
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- Yomogida Kiyoshi
- Department of Earth and Planetary Systems Science, Faculty of Science
書誌事項
- タイトル別名
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- Group Velocity Measurement of Surface W
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抄録
A new time-series analysis called "wavelet transform" is applied to measure the group velocity of surface waves as compared with that obtained by the conventional Fourier transform. We use vertical-component Rayleigh waves for both synthetic seismograms and GDSN long-period data of oceanic paths. The results of this study are summarized as follows: for synthetic seismograms, moving-window analysis using the Fourier transform can measure the group velocity of the fundamental mode correctly, while the group velocity of the first-higher mode is systematically larger than the correct value. In contrast, the wavelet transform measures the group velocity of both modes precisely although the resolution in frequency may not be sufficiently high. For GDSN data propagating along the Pacific Ocean, both methods provide stable results for the group velocity of the fundamental mode in the period range of 20 to 100 s. Using the Fourier transform, we obtain the group velocities of the first-higher mode between 20 and 40 s although these values seem unreliable. In contrast, the wavelet transform can measure both modes precisely in the period range of 20 to 100 s for non-shallow events and even for shallow events with relatively small noise in the data. Another advantage of the wavelet analysis is that we can specify resolving power in group velocity measurement rigorously.
収録刊行物
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- Journal of Physics of the Earth
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Journal of Physics of the Earth 45 (5), 313-329, 1997
公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、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
- 1390282681486802560
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- NII論文ID
- 130003785419
- 10002429142
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- NII書誌ID
- AA00704960
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- ISSN
- 18842305
- 00223743
- http://id.crossref.org/issn/00223743
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- NDL書誌ID
- 4406074
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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
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可