柴田律也博士（防災科学技術研究所：特別研究員）のセミナーを下記のとおり開催いたします。
皆様のご参加をお待ちしております。
We are pleased to announce the following seminar by Dr. Ritsuya Shibata (NIED).
We look forward to your participation.
日時 / Date：Nov.25, 15:00-16:30
場所 / Venue：宇治キャンパス 防災研究所 地震災害研究センター棟C200 & Zoom
講演者 / Speaker：柴田律也（防災科学技術研究所 巨大地変災害研究領域地震津波複合災害研究部門 特別研究員）
Title: Characteristics of fault rupture propagation direction for earthquakes with magnitude from 5.0 to 9.0
Abstract:
Fault rupture evolution, which is called the source process, exhibits diverse behaviors and complexities. The source process has been widely estimated by the waveform inversion method. Investigating the fault rupture complexity is important not only for understanding frictional heterogeneity on the fault plane but also for enhancing the accuracy of strong ground motion prediction. In this regard, we investigated the characteristics of the fault rupture propagation direction with various-scale source processes. Specifically, we applied a method developed by Shibata and Aso (2025, EPS) for earthquakes with magnitude from 5.0 to 9.0. Consequently, smaller earthquakes tended to propagate toward the slip direction, which can be close to the maximum shear stress direction. In this method, we need a spatiotemporal distribution of both a slip amount and direction. In contrast, the conventional source process estimation method is sometimes not valid for earthquakes in the ocean region and for small-to-moderate earthquakes. In this study, we also introduced a new waveform inversion method (Shibata and Aso, 2025, BSSA), which can widen the applicability of estimating the source processes.
Reference:
R. Shibata, N. Aso, (2025). Rupture mode preferences of crustal earthquakes in Japan, Earth, Planets and Space, 77, 124, https://doi.org/10.1186/s40623-025-02254-1.
R. Shibata, N. Aso, (2025). Kinematic source modeling using radiation-corrected empirical Green’s functions in waveform inversion, Bulletin of the Seismological Society of America, 115(3), 1212-1232, https://doi.org/10.1785/0120240077.
柴田律也博士（防災科学技術研究所：特別研究員）のセミナーを下記のとおり開催いたします。
皆様のご参加をお待ちしております。
We are pleased to announce the following seminar by Dr. Ritsuya Shibata (NIED).
We look forward to your participation.
日時 / Date：Nov.25, 15:00-16:30
場所 / Venue：宇治キャンパス 防災研究所 地震災害研究センター棟C200 & Zoom
講演者 / Speaker：柴田律也（防災科学技術研究所 巨大地変災害研究領域地震津波複合災害研究部門 特別研究員）
Title: Characteristics of fault rupture propagation direction for earthquakes with magnitude from 5.0 to 9.0
Abstract:
Fault rupture evolution, which is called the source process, exhibits diverse behaviors and complexities. The source process has been widely estimated by the waveform inversion method. Investigating the fault rupture complexity is important not only for understanding frictional heterogeneity on the fault plane but also for enhancing the accuracy of strong ground motion prediction. In this regard, we investigated the characteristics of the fault rupture propagation direction with various-scale source processes. Specifically, we applied a method developed by Shibata and Aso (2025, EPS) for earthquakes with magnitude from 5.0 to 9.0. Consequently, smaller earthquakes tended to propagate toward the slip direction, which can be close to the maximum shear stress direction. In this method, we need a spatiotemporal distribution of both a slip amount and direction. In contrast, the conventional source process estimation method is sometimes not valid for earthquakes in the ocean region and for small-to-moderate earthquakes. In this study, we also introduced a new waveform inversion method (Shibata and Aso, 2025, BSSA), which can widen the applicability of estimating the source processes.
Reference:
R. Shibata, N. Aso, (2025). Rupture mode preferences of crustal earthquakes in Japan, Earth, Planets and Space, 77, 124, https://doi.org/10.1186/s40623-025-02254-1.
R. Shibata, N. Aso, (2025). Kinematic source modeling using radiation-corrected empirical Green’s functions in waveform inversion, Bulletin of the Seismological Society of America, 115(3), 1212-1232, https://doi.org/10.1785/0120240077.
© Research Center for Earthquake Hazards.
© Research Center for Earthquake Hazards.
