日本地球惑星科学連合2024年大会

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セッション記号 S (固体地球科学) » S-CG 固体地球科学複合領域・一般

[S-CG40] Science of slow-to-fast earthquakes

2024年5月29日(水) 15:30 〜 16:45 コンベンションホール (CH-B) (幕張メッセ国際会議場)

コンビーナ:加藤 愛太郎(東京大学地震研究所)、山口 飛鳥(東京大学大気海洋研究所)、濱田 洋平(国立研究開発法人海洋研究開発機構)、野田 朱美(気象庁気象研究所)、座長:井出 哲(東京大学大学院理学系研究科地球惑星科学専攻)、北 佐枝子(建築研究所)

16:30 〜 16:45

[SCG40-40] Rapid slip modeling of large earthquakes by joint inversion of W-phase and back-projected images

*Yuyang Peng1、Dun Wang1、Nozomu Takeuchi2 (1.China Univ. of Geosciences、2.Univ. of Tokyo)

キーワード:Rapid slip model, Large earthquake, Joint inversion

We present an innovative finite fault inversion algorithm that combines W-phase finite fault inversion with Image Deconvolution Back-Projection (IDBP) for the rapid determination of coseismic slip models following significant earthquakes. This integrated algorithm synergistically leverages the strengths of both methods, enabling precise determination of moment tensor, slip distribution, and centroid location. The application of this integrated algorithm to the analysis of the 2015 Mw 7.8 Nepal and the 2013 Mw 7.5 Alaska earthquakes yielded results closely aligned with detailed post-earthquake studies, highlighting the algorithm's accuracy and reliability. By overcoming inherent limitations of individual methods, it provides a comprehensive understanding of the earthquake source process. The algorithm's automated implementation potential, requiring minimal parameters, enhances its suitability for near real-time earthquake analysis, with promising applications in disaster mitigation and tsunami hazard assessment.