Earthquake Generation Processes in Japan

2025 Aomori-Oki and Sanriku-Oki Megathrust Sequences

• 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
• 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

Noto Earthquake Sequence (2020–)

• Takahashi, H., Y. Aoyagi, K. Yoshida, H. Kimura, E. Kurashimo, S. Sakai, 2026, High-Precision Aftershock Distribution Highlights the Complex Fault Geometry of the 2024 Mw 7.5 Noto Peninsula Earthquake, Geophysical Research Letters, 53, e2025GL118413. https://doi.org/10.1029/2025GL118413
• 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
• 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
• 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
• Yamada, T., Y. Ohta, T. Nishimura, Yoshida, K., Y. Hiramatsu, Y. Kinoshita, 2025, Coseismic slip distribution of the 2024 Noto Peninsula earthquake deduced from dense global navigation satellite system network and interferometric synthetic aperture radar data: Effect of assumed dip angle, Earth, Planets and Space, 77(19). https://doi.org/10.1186/s40623-025-02154-4
• Tagami, A., T. Okada, M. K. Savage, C. Chamberlain, T. Matsuzawa, R. Fujimura, K. Tateiwa, K. Yoshida, R. Takagi, S. Kimura, S. Hirahara, T. Yamada, Y. Ohta, 2025, Evaluation of the favorability of faults to slip: the case of the 2024 Noto Peninsula earthquake, Earth, Planets and Space, 77, 107. https://doi.org/10.1186/s40623-025-02235-4
• Matsumoto, R., Yoshida, K., 2024, Quasi-Real-Time Earthquake Relocation and Monitoring in the Northeastern Noto Peninsula, Earth, Planets and Space, 76(131). https://doi.org/10.1186/s40623-024-02079-4
• Yoshida, K., R. Takagi, Y. Fukushima, R. Ando, Y. Ohta, Y. Hiramatsu, 2024, Role of a Hidden Fault in the Early Process of the 2024 Mw 7.5 Noto Peninsula Earthquake, Geophysical Research Letters, 51(16), e2024GL110993. https://doi.org/10.1029/2024GL110993
• 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
• Okada, T., M. K. Savage, S. Sakai, Yoshida, K., N. Uchida, R. Takagi, S. Kimura, S. Hirahara, A. Tagami, R. Fujimura, T. Matsuzawa, E. Kurashimo, Y. Hiramatsu, 2024, Shear wave splitting and seismic velocity structure in the focal area of the earthquake swarm and their relation with earthquake swarm activity in the Noto Peninsula, central Japan, Earth, Planets and Space, 76(24). https://doi.org/10.1186/s40623-024-01974-0
• Yoshida, K., N. Uchida, Y. Matsumoto, M. Orimo, T. Okada, S. Hirahara, S. Kimura, R. Hino, 2023, Updip Fluid Flow in the Crust of the Northeastern Noto Peninsula, Japan, Triggered the 2023 Mw 6.2 Suzu Earthquake During Swarm Activity, Geophysical Research Letters, 50(21), e2023GL106023. https://doi.org/10.1029/2023GL106023
• Yoshida, K., M. Uno, T. Matsuzawa, Y. Yukutake, Y. Mukuhira, H. Sato, T. Yoshida, 2023, Upward Earthquake Swarm Migration in the Northeastern Noto Peninsula, Japan, Initiated From a Deep Ring-Shaped Cluster: Possibility of Fluid Leakage From a Hidden Magma System, Journal of Geophysical Research: Solid Earth, 128(6), e2022JB026047. https://doi.org/10.1029/2022JB026047

Miyagi-Oki M~7 Interplate Earthquake Sequences

• 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

Fluid-Driven Swarms Triggered by the 2011 Tohoku-Oki Earthquake

• Yoshida, K., 2021, Studies about the Impacts of Upward Fluid Migration on the Earthquake Occurrence: Constraints from Seismicity Triggered by the 2011 Tohoku-Oki Earthquake, Zisin 2, 74, 95–116. https://doi.org/10.4294/zisin.2020-20
• Yoshida, K., T. Matsuzawa, 2020, Heterogeneity in stress field in NE Japan and its implication for the fault strength and the earthquake occurrence mechanism, Journal of Geography (Chigaku Zasshi), 129(4), 451–471. https://doi.org/10.5026/jgeography.129.451
• Yoshida, K., A. Hasegawa, T. Yoshida, T. Matsuzawa, 2019, Heterogeneities in stress and strength in Tohoku and its relationship with earthquake sequences triggered by the 2011 M9 Tohoku-Oki earthquake, Pure and Applied Geophysics, 176(3), 1335–1355. https://doi.org/10.1007/s00024-018-2073-9
• Yoshida, K., A. Hasegawa, 2018, Hypocenter Migration and Seismicity Pattern Change in the Yamagata-Fukushima Border, NE Japan, Caused by Fluid Movement and Pore Pressure Variation, Journal of Geophysical Research: Solid Earth, 123(6), 5000–5017. https://doi.org/10.1029/2018JB015468
• Yoshida, K., A. Hasegawa, 2018, Sendai-Okura earthquake swarm induced by the 2011 Tohoku-Oki earthquake in the stress shadow of NE Japan: Detailed fault structure and hypocenter migration, Tectonophysics, 733, 132–147. https://doi.org/10.1016/j.tecto.2017.12.031
• 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
• Yoshida, K., A. Hasegawa, T. Yoshida, 2016, Temporal variation of frictional strength in an earthquake swarm in NE Japan caused by fluid migration, Journal of Geophysical Research: Solid Earth, 121, 4047–4063. https://doi.org/10.1002/2016JB013022

Possible Fluid-Driven Mainshock-Aftershock Sequences

• Yoshida, K., N. Uchida, S. Hirahara, T. Nakayama, T. Matsuzawa, T. Okada, Y. Matsumoto, A. Hasegawa, 2020, 2019 M6.7 Yamagata-Oki earthquake in the stress shadow of 2011 Tohoku-Oki earthquake: Was it caused by the reduction in fault strength?, Tectonophysics, 793, 228609. https://doi.org/10.1016/j.tecto.2020.228609
• Matsumoto, Y., Yoshida, K., T. Matsuzawa, A. Hasegawa, 2021, Fault-valve behavior estimated from intensive foreshocks and aftershocks of the 2017 M 5.3 Kagoshima Bay earthquake sequence, Kyushu, southern Japan, Journal of Geophysical Research: Solid Earth, 126(5), e2020JB020278. https://doi.org/10.1029/2020JB020278
• Yoshida, K., T. Taira, Y. Matsumoto, T. Saito, K. Emoto, T. Matsuzawa, 2020, Stress Release Process Along an Intraplate Fault Analogous to the Plate Boundary: A Case Study of the 2017 M 5.2 Akita-Daisen Earthquake, NE Japan, Journal of Geophysical Research: Solid Earth, 125(5), e2020JB019527. https://doi.org/10.1029/2020JB019527

2016 Kumamoto Earthquake

• Orimo, M., Yoshida, K., T. Matsuzawa, A. Hasegawa, M. Yamamoto, 2026, Different Radiation Characteristics Between Foreshocks and Aftershocks of the 2016 Mw 7.0 Kumamoto Earthquake in Kyushu, Japan: Implication of Pore Pressure, Stress Concentration, and Loading Rate, Journal of Geophysical Research: Solid Earth, 131, e2025JB032201. https://doi.org/10.1029/2025JB032201
• 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
• Yoshida, K., A. Hasegawa, T. Saito, Y. Asano, S. Tanaka, K. Sawazaki, Y. Urata, E. Fukuyama, 2016, Stress rotations due to the M6.5 foreshock and M7.3 mainshock in the 2016 Kumamoto, SW Japan, earthquake sequence, Geophysical Research Letters, 43, 10,097–10,104. https://doi.org/10.1002/2016GL0705812

2008 Iwate-Miyagi Earthquake

• Yoshida, K., A. Hasegawa, T. Okada, T. Iinuma, 2014, Changes in the stress field after the 2008 M7.2 Iwate-Miyagi Nairiku earthquake in northeastern Japan, Journal of Geophysical Research: Solid Earth, 119(12), 9016–9030. https://doi.org/10.1002/2014JB011291
• Yoshida, K., A. Hasegawa, T. Okada, H. Takahashi, M. Kosuga, T. Iwasaki, Y. Yamanaka, H. Katao, Y. Iio, A. Kubo, T. Matsushima, H. Miyamachi, Y. Asano, 2014, Pore pressure distribution in the focal region of the 2008 M7.2 Iwate-Miyagi Nairiku earthquake, Earth, Planets and Space, 66, 59. https://doi.org/10.1186/1880-5981-66-59

2011 Tohoku-Oki Earthquake

• Hasegawa, A., K. Yoshida, T. Okada, 2011, Nearly complete stress drop in the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake, Earth, Planets and Space, 63, 703–707. https://doi.org/10.5047/eps.2011.06.007
• 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

Low-Frequency Earthquakes

• 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

Others

• Yukutake, Y., Yoshida, K., R. Honda, 2022, Interaction Between Aseismic Slip and Fluid Invasion in Earthquake Swarms Revealed by Dense Geodetic and Seismic Observations, Journal of Geophysical Research: Solid Earth, 127(4). https://doi.org/10.1029/2021jb022933
• Kubota, T., H. Kubo, K. Yoshida, N. Y. Chikasada, W. Suzuki, T. Nakamura, H. Tsushima, 2021, Improving the Constraint on the Mw 7.1 2016 Off-Fukushima Shallow Normal-faulting Earthquake With the High Azimuthal Coverage Tsunami Data From the S-net Wide and Dense Network: Implication for the Stress Regime in the Tohoku Overriding Plate, Journal of Geophysical Research: Solid Earth, 126(10). https://doi.org/10.1029/2021JB022223
• Maeda, S., T. Matsuzawa, T. Shinji, K. Yoshida, H. Katao, 2018, Complex microseismic activity and depth-dependent stress field changes in Wakayama, southwestern Japan, Earth, Planets and Space, 70, 21. https://doi.org/10.1186/s40623-018-0788-6
• Yoshida, K., A. Hasegawa, T. Okada, 2016, Heterogeneous stress field in the source area of the 2003 M6.4 Northern Miyagi Prefecture, NE Japan, earthquake, Geophysical Journal International, 206(1), 408–419. https://doi.org/10.1093/gji/ggw160
• Yoshida, K., A. Hasegawa, T. Okada, 2015, Spatially heterogeneous stress field in the source area of the 2011 Mw 6.6 Fukushima-Hamadori earthquake, NE Japan, probably caused by static stress change, Geophysical Journal International, 201(2), 1060–1069. https://doi.org/10.1093/gji/ggv068
• Nakajima, J., K. Yoshida, A. Hasegawa, 2013, An intraslab seismic sequence activated by the Tohoku-oki earthquake: Evidence for fluid-related embrittlement, Journal of Geophysical Research: Solid Earth, 118, 3492–3505. https://doi.org/10.1002/jgrb.50246

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