Local Effects on Strain Seismograms at Matsushiro Seismological Observatory - 2. Rayleigh Waves
We evaluate local effects on strain seismograms for a Rayleigh wave observed at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, by applying a method proposed in a previous report (Okamoto et al. 2007). The method involves examination of polarization angles, local ph...
| 出版年: | Terrestrial, Atmospheric and Oceanic Sciences |
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| 主要な著者: | , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
Springer
2007-01-01
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| 主題: | |
| オンライン･アクセス: |
http://tao.cgu.org.tw/images/attachments/v185p901.pdf
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| 要約: | We evaluate local effects on strain seismograms for a Rayleigh wave observed at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, by applying a method proposed in a previous report (Okamoto et al. 2007). The method involves examination of polarization angles, local phase velocity, and accuracy of velocity seismograms. The results are as follows: 1) Polarization angles of observed strain seismograms agree with expected ones from those of velocity seismograms also observed at Matsushiro; 2) Local phase velocity estimated by comparison between strain and velocity seismograms is 54% larger than the theoretical value calculated from the PREM velocity model; 3) Velocity spectra observed at Matsushiro have almost the same amplitude as an average of those at F-net observation stations near Matsushiro. These results indicate that both EW and NS component strain seismograms observed at Matsushiro have been reduced by 35% in amplitude for a Rayleigh wave due to local heterogeneity. The local effects on a Rayleigh wave are quite different from that on a Love wave obtained in the previous report. |
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| ISSN: | 1017-0839 2311-7680 |