Assistant Professor
　Graduate School of Science　Faculty of Science

Research Interests:

　Earthquake source is underground rupture. We can investigate the process of this underground rupture phenomenon, i.e., what happens at the earthquake source, from the analysis of the ground surface shaking data (seismic waveform data). “Approach to the mystery of earthquake rupture process using seismic waveform data” is the main research interest of mine. In order to investigate what happens at the underground earthquake source using the ground surface shaking, we need knowledge on the mechanism of wave generation and propagation when rupture happens beneath the ground. This is provided by the physics called “Theory of Elastic Waves.” The physics called “Theory of Rupture Dynamics” helps to understand the rupture phenomenon itself. For the data analysis, mathematical methods such as least square method are necessary. Knowledge of Linear Algebra helps it. Like this, physics and mathematics are powerful tools for the study on earthquakes. This was unexpected, and at the same time a pleasant surprise for me when I was a undergraduate student. This odd (?) combination of earthquakes, physics, and mathematics remains to give academic stimulation to me even after I became a professional researcher.

Recent Publications:　

• 下元一輝・筧　楽麿，海域で発生する地震による地震波伝播の数値シミュレーションによるケーススタディ，神戸大学都市安全研究センター研究報告，27，124-141，2023.
• Kakehi, Y., Characteristics of the strong ground motions from the 2018 Hokkaido Eastern Iburi earthquake from the analysis of high-density strong ground motion data, 17WCEE, 1d-0060, 1-9, 2021.
• 筧　楽麿，高密度強震データによる東北日本のスラブ内・プレート境界地震の距離減衰特性の検討，第15回日本地震工学シンポジウム論文集，263-272，2018．
• 笠谷直矢・筧　楽麿（2014），スペクトルインバージョンに基づく宮城県沖のスラブ内地震とプレート境界地震の震源特性，地震 第2輯，67，57-79, DOI:10.4294/zisin.67.57．
• Kimura, T. and Y. Kakehi (2005), Source process of the 2001 Hyogo-ken Hokubu, Japan, earthquake (Mw 5.2) and comparison between the aftershock activity and the static stress change, Bull. Seismol. Soc. Am., 95, 145-158.
• Kakehi, Y., (2004), Analysis of the 2001 Geiyo, Japan, earthquake using high-density strong ground motion data: Detailed rupture process of a slab earthquake in a medium with a large velocity contrast, J. Geophys. Res., 109, B08306, doi:10.1029/2004JB002980.

Academic Associations:

• Seismological Society of Japan (Japanese)
• American Geophysical Union
• Japan Geoscience Union

更新日　2025年4月30日