Articles | Volume 16, issue 6
https://doi.org/10.5194/se-16-579-2025
https://doi.org/10.5194/se-16-579-2025
Research article
 | 
30 Jun 2025
Research article |  | 30 Jun 2025

Accretionary prism deformation and fluid migration caused by slow earthquakes in the Nankai subduction zone

Takashi Tonegawa, Takeshi Akuhara, Yusuke Yamashita, Hiroko Sugioka, Masanao Shinohara, Shunsuke Takemura, and Takeshi Tsuji

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Subject area: Crustal structure and composition | Editorial team: Seismics, seismology, paleoseismology, geoelectrics, and electromagnetics | Discipline: Seismology
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Cited articles

Akuhara, T., Tsuji, T., and Tonegawa, T.: Overpressured Underthrust Sediment in the Nankai Trough Forearc Inferred From Transdimensional Inversion of High-Frequency Teleseismic Waveforms, Geophys. Res. Lett., 47, e2020GL088280, https://doi.org/10.1029/2020GL088280, 2020. 
Akuhara, T., Yamashita, Y., Ohyanagi, S., Sawaki, Y., Yamada, T., and Shinohara, M.: Shallow Low-Velocity Layer in the Hyuga-Nada Accretionary Prism and Its Hydrological Implications: Insights From a Passive Seismic Array, J. Geophys. Res.-Sol. Ea., 128, e2022JB026298, https://doi.org/10.1029/2022JB026298, 2023a. 
Akuhara, T., Yamashita, Y., Sugioka, H., and Shinohara, M.: Locating tectonic tremors with uncertainty estimates: time- and amplitude-difference optimization, wave propagation-based quality control and Bayesian inversion, Geophys. J. Int., 235, 2727–2742, https://doi.org/10.1093/gji/ggad387, 2023b. 
Annoura, S., Hashimoto, T., Kamaya, N., and Katsumata, A.: Shallow episodic tremor near the Nankai Trough axis off southeast Mie prefecture, Japan, Geophys. Res. Lett., 44, 3564–3571, https://doi.org/10.1002/2017GL073006, 2017. 
Aoi, S., Asano, Y., Kunugi, T., Kimura, T., Uehira, K., Takahashi, N., Ueda, H., Shiomi, K., Matsumoto, T., and Fujiwara, H.: MOWLAS: NIED observation network for earthquake, tsunami and volcano, Earth Planets Space, 72, 126, https://doi.org/10.1186/s40623-020-01250-x, 2020. 
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Short summary
This study demonstrates that for slow earthquakes in the shallow Nankai subduction zone, (1) the seismic velocity reductions in the accretionary prism reflect the stress field changes due to the slow earthquakes, and (2) the temporal variations in the heterogeneous structure correspond to upward fluid migrations from the source region of the slow earthquakes.
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