| 講演要旨(和文) | | 理論的手法に基づく地震動の評価精度を向上させるためには，過去の地震動記録の分析を通して観測地震動の特徴を明らかにし，地震動シミュレーションによってその再現精度を適切に把握することが重要となる．本検討では，都心部で観測された2011年富士山付近の地震(Mj6.4)による周期7〜8秒程度の長周期地震動に注目し，関東平野の堆積層によって励起されたラブ波伝播特性を明らかにした．そして，地震調査研究推進本部(2009)の地下構造モデルを用いた三次元差分法による地震動シミュレーションを実施し，ラブ波伝播特性の再現性という観点から地下構造モデルの妥当性および課題点を把握することを試みた．観測と計算によるラブ波伝播特性を比べたところ，定性的な特徴は整合する地域がある一方で，特に神奈川県東部で異なる性状を示すことが分かった． |
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| | 講演要旨(英文) | | To improve the accuracy of earthquake ground motion estimation based on theoretical methods, it's important to study ground motion characteristics with observation records, and understand the present accuracy of earthquake ground motion simulation appropriately. We investigated the characteristics of Love wave propagation in Kanto basin during the 2011 Mt. Fuji Region earthquake. Then, we performed the simulation using the structure model by the Headquarters for Earthquake Research Promotion (2009) based on 3D finite difference method, and tried to understand the validity and problems of the structure model comparing their characteristics. As a result, while there were several regions that qualitative characteristics were consistent, it turned out that obvious difference was found around eastern Kanagawa prefecture. |
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