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An evaluation of 3-D velocity models of the Kanto basin for long-period ground motion simulations
https://nied-repo.bosai.go.jp/records/4192
https://nied-repo.bosai.go.jp/records/4192dea8e817-0dc3-4c5c-bf0b-1f8c1206f98b
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 | An evaluation of 3-D velocity models of the Kanto basin for long-period ground motion simulations | |||||||||
言語 | ||||||||||
言語 | eng | |||||||||
著者 |
Yadab P. Dhakal
× Yadab P. Dhakal
× Hiroaki Yamanaka
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抄録 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | We performed three-dimensional (3-D) finite difference simulations of long-period ground motions (2-10 s) in the Kanto basin using the Japan Seismic Hazard Information Station (J-SHIS 2009), Yamada and Yamanaka (Exploration Geophysics 65(3):139-150, 2012) (YY), and Head Quarter for Earthquake Research Promotion (HERP 2012) velocity models for two intermediate depth (68-80 km) moderate earthquakes (Mw 5.8-5.9), which occurred beneath the Kanto basin. The models primarily differ in the basic data set used in the construction of the velocity models. The J-SHIS and HERP models are the results of integration of mainly geological, geophysical, and earthquake data. On the other hand, the YY model is oriented towards the microtremor-array-observation data. We obtained a goodness of fit between the observed and synthetic data based on three parameters, peak ground velocities (PGVs), smoothed Fourier spectra (FFT), and cross-correlations, using an algorithm proposed by Olsen and Mayhew (Seism Res Lett 81:715-723, 2010). We found that the three models reproduced the PGVs and FFT satisfactorily at most sites. However, the models performed poorly in terms of cross-correlations especially at the basin edges. We found that the synthetics using the YY model overestimate the observed waveforms at several sites located in the areas having V (s) 0.3 km/s in the top layer; on the other hand, the J-SHIS and HERP models explain the waveforms better at the sites and perform similarly at most sites. We also found that the J-SHIS and HERP models consist of thick sediments beneath some sites, where the YY model is preferable. Thus, we have concluded that the models require revisions for the reliable prediction of long-period ground motions from future large earthquakes. | |||||||||
言語 | en | |||||||||
書誌情報 |
en : JOURNAL OF SEISMOLOGY 巻 17, 号 3, p. 1073-1102 |
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出版者 | ||||||||||
言語 | en | |||||||||
出版者 | SPRINGER | |||||||||
ISSN | ||||||||||
収録物識別子タイプ | ISSN | |||||||||
収録物識別子 | 1383-4649 | |||||||||
DOI | ||||||||||
関連識別子 | 10.1007/s10950-013-9373-4 |