Articles | Volume 15, issue 2
https://doi.org/10.5194/se-15-143-2024
https://doi.org/10.5194/se-15-143-2024
Research article
 | 
07 Feb 2024
Research article |  | 07 Feb 2024

Subduction plate interface shear stress associated with rapid subduction at deep slow earthquake depths: example from the Sanbagawa belt, southwestern Japan

Yukinojo Koyama, Simon R. Wallis, and Takayoshi Nagaya

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Latest update: 23 Apr 2024
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Short summary
Stress along a subduction plate boundary is important for understanding subduction phenomena such as earthquakes. We estimated paleo-stress using quartz recrystallized grain size combined with deformation temperature and PT paths of exhumed rocks. The obtained results show differential stresses of 30.8–82.7 MPa consistent over depths of 17–27 km in the paleo-subduction boundary. The obtained stress may represent the initial conditions under which slow earthquakes nucleated in the same domain.