Keisuke Yoshida
Keisuke Yoshida

Keisuke Yoshida

Associate Professor · Graduate School of Science, Tohoku University

I study how and why earthquakes happen — connecting earthquake repetition, rupture, and seismicity to the evolving stress, strength, and fluids in the Earth's crust.

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Japan's recent earthquakes — the 2025 Aomori-oki and Sanriku-oki megathrust sequences and the 2024 Noto Peninsula earthquake — show how seismic and aseismic slip, crustal fluids, and the evolving stress field together control where and when earthquakes happen. I track this evolution by combining dense seismic observations with physical modeling, and openly share the resulting hypocenter catalogs, rupture models, and other datasets on the data page.

Two threads run through this work. One is a long-running study of repeating and quasi-repeating earthquakes as sensors of fault-state evolution — from the Mw 6.0–6.8 quasi-repeaters off Miyagi (Yoshida, 2023, JGR) to a systematic look at how rupture patterns respond to loading rate (Yoshida & Ide, 2025, GRL) and a re-examination of what counts as a true repeater versus an apparent one (Yoshida, 2025, JGR). The other is how ruptures propagate and stop as they cross heterogeneous stress and strength conditions — including rupture propagation across a stress-regime transition in the 2023 Mw 7.8 Kahramanmaraş earthquake (Yoshida, 2024, GJI) and the prevalence of updip rupture propagation along the Japan Trench (Yoshida et al., 2022, EPSL).

Highlights

2026 · GRL

The 2025 Mw 7.6 Aomori-oki megathrust sequence and a slip-parallel seismic belt to the trench.
2026 · GRL

Evolution of coupled seismic–aseismic slip during the 2025 Mw 6.8 Sanriku-oki sequence.

Guest editor

EPS special issue on the 2025 Mw 7.6 off-Aomori earthquake — open until 31 Mar 2027.

Featured

Spatiotemporal migration of the Noto earthquake swarm
Spatiotemporal migration of the Noto Peninsula earthquake swarm.From Yoshida et al. (2023, JGR).
Source time functions across azimuth
Source time functions across azimuth, revealing rupture directivity and complexity.From Yoshida & Kanamori (2023, GJI).
Repeating large earthquakes rupturing the same fault patch
Repeating large earthquakes rupturing the same fault patch over time — a direct expression of the earthquake cycle.From Yoshida et al. (2022, JGR).
Depth-dependent rotation of the crustal stress field
Depth-dependent rotation of the crustal stress field.From Yoshida et al. (2014, JGR).

Recent publications

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Research interests