Study on validation and verification of the underground seismic velocity model for broad-band ground motion prediction

2014 Fiscal Year Final Research Report

• Project/Area Number: 23310121
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Natural disaster science
• Research Institution: Kyoto University
• Principal Investigator: IWATA Tomotaka 京都大学, 防災研究所, 教授 (80211762)
• Co-Investigator(Kenkyū-buntansha): MATSUSHIMA Shin'ichi 京都大学, 防災研究所, 准教授 (30393565) ; YOSHIDA Kunikazu 一般財団法人地域地盤環境研究所, 主任研究員 (50425732) ; AOI Shin 国立研究開発法人防災科学技術研究所, 総括主任研究員 (80360379) ; ASANO Kimiyuki 京都大学, 防災研究所, 助教 (80452324)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 地震動予測 / 地下速度構造モデル / 観測点間グリーン関数 / 地震波干渉法 / 堆積盆地構造

Outline of Final Research Achievements

Improvement of basin and crustal velocity structure models is very important for the reliable strong ground motion prediction. We validated Kyoto and Osaka basin velocity structure models by simulating observed ground motions of large- and moderate-size earthquakes and microtremor H/V spectral ratios. For the Osaka model, we collected strong motion records of many organizations for the 2011 Tohoku and the 2013 Awajishima earthquakes and conducted ground motion simulations. Simulated ground motions using the newest Osaka basin velocity model explained well the main features of the observed ground motions in the period range more than 2 seconds for the 2013 Awajishima earthqauke. We also give an appropriate Q-value in the basin structure model for explaining long duration in the observed data. For Kyoto basin, the site underground velocity structures are modelled by the earthquake ground motion and microtremor HV spectral ratio. Broad-band velocity models are obtained.

Free Research Field

強震動地震学