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Characterization of scattered seismic wavefields simulated in heterogeneous media with topography
https://nied-repo.bosai.go.jp/records/4538
https://nied-repo.bosai.go.jp/records/4538c70b510f-4418-4aa2-810e-58e320e02618
| Item type | researchmap(1) | |||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||
| タイトル | ||||||||||||||
| 言語 | en | |||||||||||||
| タイトル | Characterization of scattered seismic wavefields simulated in heterogeneous media with topography | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 著者 |
Hiroyuki Kumagai
× Hiroyuki Kumagai
× Tatsuhiko Saito
× Gareth O'Brien
× Tadashi Yamashina
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| 抄録 | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | We performed numerical simulations of seismic waveforms with frequencies up to 10 Hz in heterogeneous media with topography to investigate the effects of topography and structural heterogeneity on seismic scattering. We used the simulated waveforms to test the source location method assuming isotropic radiation of S waves for long-period events and tremor at volcanoes. The assumption of isotropic radiation has been shown previously to be valid in a high-frequency band because of the path effect caused by the scattering of seismic waves. Our simulation results showed that distortion of the wavefields increased as the correlation distance of structural heterogeneity (a) decreased, as the frequency increased, and as the travel distance increased. Topography alone considerably distorted the wavefields. However, we found that strong scattering due to topography was suppressed if the correlation distance of structural heterogeneity was longer than the S wave wavelength. Isotropic radiation of S waves by scattering due to topography was not achieved in our simulations. Our results indicated that scattering due to structural heterogeneity becomes stronger than that due to topography at ka congruent to 1 and a = 50 m, where k is the wave number of the S waves. This suggests that strong short-scale structural heterogeneity is required to achieve isotropic radiation of S waves. Although we could not reproduce isotropic radiation, our results support the validity of the assumption of isotropic radiation in the source location method. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 巻 116, 発行日 2011-03 |
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| 言語 | en | |||||||||||||
| 出版者 | AMER GEOPHYSICAL UNION | |||||||||||||
| ISSN | ||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||
| 収録物識別子 | 2169-9356 | |||||||||||||
| DOI | ||||||||||||||
| 関連識別子 | 10.1029/2010JB007718 | |||||||||||||
