Earthquake Cycles & Source Studies

Earthquake repetition, energy radiation, stress drop, rupture patterns (directivity, complexity, slip evolution), and source time functions across a wide magnitude range.

Earthquake Repetition Pattern

• Yoshida, K., 2025, Different Seismogenic Environments of Interplate and Intraslab Earthquakes: Re-Examination of Apparent Repeating Earthquakes, Journal of Geophysical Research: Solid Earth, 130(8), e2025JB031433. https://doi.org/10.1029/2025JB031433
• Yoshida, K., S. Ide, 2025, Highly Systematic Response of Seismic Rupture Patterns to Background Loading Rate: Insights From Repeating Earthquakes, Geophysical Research Letters, 52(10), e2025GL115207. https://doi.org/10.1029/2025GL115207
• Yoshida, K., Y. Fukushima, Y. Kaneko, 2025, Near-Field Imaging of Near-Identical Mw5.9 Earthquakes in the Crust of Ibaraki, Japan, Journal of Geophysical Research: Solid Earth, 130(2), e2024JB029791. https://doi.org/10.1029/2024JB029791
• Yoshida, K., 2023, The Mw 6.0–6.8 quasi-repeating earthquakes off Miyagi, Japan, with variable moment release patterns due to a hidden adjacent slip patch, Journal of Geophysical Research: Solid Earth, 128(2), e2022JB025654. https://doi.org/10.1029/2022JB025654
• Yoshida, K., T. Matsuzawa, N. Uchida, 2022, The 2021 Mw7.0 and Mw6.7 Miyagi-Oki earthquakes nucleated in a deep seismic/aseismic transition zone: Possible effects of transient instability due to the 2011 Tohoku earthquake, Journal of Geophysical Research: Solid Earth, 127(8). https://doi.org/10.1029/2022JB024887

Radiated Energy Estimation

• Orimo, M., Yoshida, K., T. Matsuzawa, A. Hasegawa, M. Yamamoto, 2026, Discrepancy Between Local and Moment Magnitudes Attributed to Radiated Seismic Energy, Earth, Planets and Space, 78, 131. https://doi.org/10.1186/s40623-026-02482-z
• Yoshida, K., T. Yamada, 2026, Discrete radiation sources of the 2024 Noto Peninsula earthquake: linking teleseismic pulses and near-field observations, Earth, Planets and Space, 78, 61. https://doi.org/10.1186/s40623-026-02397-9
• Orimo, M., Yoshida, K., T. Matsuzawa, T. Taira, K. Emoto, A. Hasegawa, 2025, Systematic Differences in Energy Radiation Processes Between Regular and Intraplate Low-Frequency Earthquakes Around the Focal Area of the 2008 Mw 6.9 Iwate-Miyagi, Japan, Earthquake, Journal of Geophysical Research: Solid Earth, 130(3), e2024JB030750. https://doi.org/10.1029/2024JB030750
• Yoshida, K., K. Emoto, S. Takemura, T. Matsuzawa, 2024, Near-Source Waveform Modeling to Estimate Shallow Crustal Attenuation and Radiated Energy of Mw 2.0–4.5 Earthquakes, Journal of Geophysical Research: Solid Earth, 129(9), e2023JB028523. https://doi.org/10.1029/2023JB028523
• Yoshida, K., H. Kanamori, 2023, Time-domain source parameter estimation of Mw 3–7 earthquakes in Japan from a large database of moment-rate functions, Geophysical Journal International, 234(1), 243–262. https://doi.org/10.1093/gji/ggad068

Source Complexity of Small Earthquakes

• Ide, S., K. Yoshida, 2026, Predictable and unpredictable aspects of earthquakes from P-wave onsets of acceleration seismograms, Earth, Planets and Space, 78, 28. https://doi.org/10.1186/s40623-025-02357-9
• Yoshida, K., S. Ide, 2025, Highly Systematic Response of Seismic Rupture Patterns to Background Loading Rate: Insights From Repeating Earthquakes, Geophysical Research Letters, 52(10), e2025GL115207. https://doi.org/10.1029/2025GL115207
• Yoshida, K., 2024, Direct Evidence for Diverse Source Complexity in Small Earthquakes (Mw 3.3–5.0) Obtained from Near-Source Borehole Seismic Data, Seismological Research Letters, 95(4), 2409–2421. https://doi.org/10.1785/0220230431
• Yoshida, K., H. Kanamori, 2023, Time-domain source parameter estimation of Mw 3–7 earthquakes in Japan from a large database of moment-rate functions, Geophysical Journal International, 234(1), 243–262. https://doi.org/10.1093/gji/ggad068

Rupture Directivity of Small Earthquakes

• Yoshida, K., S. Ide, 2025, Highly Systematic Response of Seismic Rupture Patterns to Background Loading Rate: Insights From Repeating Earthquakes, Geophysical Research Letters, 52(10), e2025GL115207. https://doi.org/10.1029/2025GL115207
• Yoshida, K., N. Uchida, H. Kubo, R. Takagi, S. Xu, 2022, Prevalence of updip rupture propagation in interplate earthquakes along the Japan trench, Earth and Planetary Science Letters, 578, 117306. https://doi.org/10.1016/j.epsl.2021.117306
• Ikeda, R., Yoshida, K., T. Matsuzawa, 2022, Simultaneous estimation of stress drop and rupture directivity of small earthquakes near the Fukushima-Ibaraki border, Tohoku Journal of Natural Disaster Science, 58, 25–30 (in Japanese). http://nds-tohoku.in.arena.ne.jp/ndsjournal/volume58/58-5.pdf
• Yoshida, K., H. Noda, M. Nakatani, B. Shibazaki, 2021, Backward earthquake ruptures far ahead of fluid invasion: Insights from dynamic earthquake-sequence simulations, Tectonophysics, 816, 229038. https://doi.org/10.1016/j.tecto.2021.229038
• Yoshida, K., 2019, Prevalence of asymmetrical rupture in small earthquakes and its effect on the estimation of stress drop: a systematic investigation in inland Japan, Geoscience Letters, 6. https://doi.org/10.1186/s40562-019-0145-z
• Yoshida, K., T. Saito, K. Emoto, Y. Urata, D. Sato, 2019, Rupture directivity, stress drop, and hypocenter migration of small- and moderate-sized earthquakes in the Yamagata-Fukushima border swarm triggered by upward pore-pressure migration after the 2011 Tohoku-Oki earthquake, Tectonophysics, 769. https://doi.org/10.1016/j.tecto.2019.228184

Low-Frequency Earthquakes

• Orimo, M., Yoshida, K., T. Matsuzawa, T. Taira, K. Emoto, A. Hasegawa, 2025, Systematic Differences in Energy Radiation Processes Between Regular and Intraplate Low-Frequency Earthquakes Around the Focal Area of the 2008 Mw 6.9 Iwate-Miyagi, Japan, Earthquake, Journal of Geophysical Research: Solid Earth, 130(3), e2024JB030750. https://doi.org/10.1029/2024JB030750
• Yoshida, K., A. Hasegawa, S. Noguchi, K. Kasahara, 2020, Low-frequency earthquakes observed in close vicinity of repeating earthquakes in the brittle upper crust of Hakodate, Hokkaido, northern Japan, Geophysical Journal International, 220(1), 793–802. https://doi.org/10.1093/gji/ggaa418

Stress Drop

• Yoshida, K., T. Saito, Y. Urata, Y. Asano, A. Hasegawa, 2017, Temporal changes in stress drop, frictional strength, and earthquake size distribution in the 2011 Yamagata-Fukushima, NE Japan, earthquake swarm, caused by fluid migration, Journal of Geophysical Research: Solid Earth, 122(12), 10,379–10,397. https://doi.org/10.1002/2017JB014334
• Ikeda, R., Yoshida, K., T. Matsuzawa, 2022, Simultaneous estimation of stress drop and rupture directivity of small earthquakes near the Fukushima-Ibaraki border, Tohoku Journal of Natural Disaster Science, 58, 25–30 (in Japanese). http://nds-tohoku.in.arena.ne.jp/ndsjournal/volume58/58-5.pdf
• Yoshida, K., 2019, Prevalence of asymmetrical rupture in small earthquakes and its effect on the estimation of stress drop: a systematic investigation in inland Japan, Geoscience Letters, 6. https://doi.org/10.1186/s40562-019-0145-z
• Yoshida, K., T. Saito, K. Emoto, Y. Urata, D. Sato, 2019, Rupture directivity, stress drop, and hypocenter migration of small- and moderate-sized earthquakes in the Yamagata-Fukushima border swarm triggered by upward pore-pressure migration after the 2011 Tohoku-Oki earthquake, Tectonophysics, 769. https://doi.org/10.1016/j.tecto.2019.228184

Attenuation and Site-Effects

• Orimo, M., Yoshida, K., T. Matsuzawa, T. Taira, K. Emoto, A. Hasegawa, 2025, Systematic Differences in Energy Radiation Processes Between Regular and Intraplate Low-Frequency Earthquakes Around the Focal Area of the 2008 Mw 6.9 Iwate-Miyagi, Japan, Earthquake, Journal of Geophysical Research: Solid Earth, 130(3), e2024JB030750. https://doi.org/10.1029/2024JB030750
• Yoshida, K., K. Emoto, S. Takemura, T. Matsuzawa, 2024, Near-Source Waveform Modeling to Estimate Shallow Crustal Attenuation and Radiated Energy of Mw 2.0–4.5 Earthquakes, Journal of Geophysical Research: Solid Earth, 129(9), e2023JB028523. https://doi.org/10.1029/2023JB028523
• Yoshida, K., 2021, Detection of temporal change in near-source attenuation during intense fluid-driven seismicity following the 2011 Tohoku-Oki earthquake, Geophysical Journal International, 224(1), 138–150. https://doi.org/10.1093/gji/ggaa421
• Yoshida, K., T. Saito, Y. Urata, Y. Asano, A. Hasegawa, 2017, Temporal changes in stress drop, frictional strength, and earthquake size distribution in the 2011 Yamagata-Fukushima, NE Japan, earthquake swarm, caused by fluid migration, Journal of Geophysical Research: Solid Earth, 122(12), 10,379–10,397. https://doi.org/10.1002/2017JB014334

Other Source Observations and Simulations

• Yoshida, K., 2026, Evolution of Coupled Seismic-Aseismic Slip During the 2025 Mw 6.8 Sanriku-Oki, Japan, Megathrust Sequence, Geophysical Research Letters, 53, e2026GL121704. https://doi.org/10.1029/2026GL121704
• Yoshida, K., M. Uno, D. Bassett, 2026, The 2025 Mw 7.6 Aomori-Oki Megathrust Sequence and a Slip-Parallel Seismic Belt to the Trench, Geophysical Research Letters, 53, e2026GL122361. https://doi.org/10.1029/2026GL122361
• Takagi, R., Yoshida, K., T. Okada, 2025, Rupture of solidified ancient magma that impeded preceding swarm migrations led to the 2024 Noto earthquake, Science Advances, 11(42), eadv5938. https://doi.org/10.1126/sciadv.adv5938
• Suzuki, R., N. Uchida, W. Zhu, G. C. Beroza, T. Nakayama, K. Yoshida, G. Toyokuni, R. Takagi, R. Azuma, A. Hasegawa, 2025, The forearc seismic belt: A fluid pathway constraining down-dip megathrust earthquake rupture, Science, 389(6756), 190–194. https://doi.org/10.1126/science.adt6389
• Ando, R., Y. Fukushima, K. Yoshida, K. Imanishi, 2025, Nonplanar 3D fault geometry controls the spatiotemporal distributions of slip and uplift: Evidence from the Mw 7.5 2024 Noto Peninsula, Japan, Earthquake, Earth, Planets and Space, 77(53). https://doi.org/10.1186/s40623-025-02187-9
• Fukushima, Y., D. Ishimura, N. Takahashi, Y. Iwasa, L. C. Malatesta, T. Takahashi, C.-H. Tang, K. Yoshida, S. Toda, 2024, Landscape changes caused by the 2024 Noto Peninsula earthquake in Japan, Science Advances, 10(49). https://doi.org/10.1126/sciadv.adp9193
• Urata, Y., K. Yoshida, E. Fukuyama, H. Kubo, 2017, 3-D Dynamic Rupture Simulations of the 2016 Kumamoto, Japan, Earthquake, Earth, Planets and Space, 69, 150. https://doi.org/10.1186/s40623-017-0733-0
• Hasegawa, A., K. Yoshida, 2015, Preceding seismic activity and slow slip events in the source area of the 2011 Mw 9.0 Tohoku-Oki earthquake: A review, Geoscience Letters, 2, 6. https://doi.org/10.1186/s40562-015-0025-0

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