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Long-period ground motions from the 2003 Tokachi-oki earthquake
https://nied-repo.bosai.go.jp/records/4188
https://nied-repo.bosai.go.jp/records/4188b7045cf2-ba18-4d79-9aa4-190cbaadeed9
| Item type | researchmap(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-30 | |||||||||
| タイトル | ||||||||||
| 言語 | en | |||||||||
| タイトル | Long-period ground motions from the 2003 Tokachi-oki earthquake | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 著者 |
Takahiro Maeda
× Takahiro Maeda
× Tsutomu Sasatani
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| 抄録 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | We study characteristics of long-period ground motions from the 2003 Tokachi-oki earthquake (Mj 8.0), a large interplate earthquake, based on spatial distribution maps and attenuation relationships for four kinds of peak ground velocity (PGV) value. The first kind ( PGV(WB)) is obtained from a maximal value of vector sum of the three-component, wide-band velocity seismograms, and the other three kinds ( PGV(BP10), PGV(BP20), and PGV(BP30)) are obtained from a maximal value of vector sum of the three-component, narrow band-pass filtered velocity seismograms ( the central periods are 10, 20, and 30 s). The spatial distribution maps for all kinds of PGV value show azimuth dependence; the PGV values in Hokkaido, northern side of the epicenter are larger than those in Tohoku, southwestern side of the epicenter, when compared at a comparable distance. We find that the features result from the radiation pattern of long-period surface waves, that is, the source effect. The attenuation relationships show the following trends: The PGV(WB) values are larger than the sum of the PGV(BP10), PGV(BP20), and PGV(BP30) at distances ( D) less than 200 km, while the PGV( WB) values are comparable to the sum of the PGV( BP20) and PGV( BP30) at D> 200 km. This indicates that the PGV( WB) values at D< 200 km are affected by ground motions with periods less than 10 s, while long-period surface waves mainly contribute to the PGV( WB) values at D> 200 km. The basin site effects generate a patchy pattern in the spatial distribution maps and a large scattering in the attenuation relationships for the PGV( WB) and PGV( BP10) values. Finally, we conclude that the PGV( WB) values from the 2003 Tokachi-oki earthquake are controlled by the radiation pattern of long-period S and surface waves and various basin site effects. | |||||||||
| 言語 | en | |||||||||
| 書誌情報 |
en : JOURNAL OF SEISMOLOGY 巻 12, 号 2, p. 243-253 |
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| 言語 | en | |||||||||
| 出版者 | SPRINGER | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | EISSN | |||||||||
| 収録物識別子 | 1573-157X | |||||||||
| DOI | ||||||||||
| 関連識別子 | 10.1007/s10950-007-9076-9 | |||||||||
