Articles | Volume 15, issue 2
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

Related subject area

Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, paleoseismology, rock physics, experimental deformation | Discipline: Structural geology
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Cited articles

Aoya, M.: P-T-D Path of Eclogite from the Sambagawa Belt Deduced from Combination of Petrological and Microstructural Analyses, J. Petrol., 42, 1225–1248, 2001. 
Aoya, M.: Structural position of the Seba eclogite unit in the Sambagawa Belt: Supporting evidence for an eclogite nappe, Isl. Arc., 11, 91–110,, 2002. 
Aoya, M. and Endo, S.: Recognition of the “early” Sambagawa metamorphism and a schematic cross-section of the Late-Cretaceous Sambagawa subduction zone, J. Geol. Soc. Japan, 123, 677–698,, 2017. 
Aoya, M., Endo, S., Mizukami, T., and Wallis, S. R.: Paleo-mantle wedge preserved in the Sambagawa high-pressure: Metamorphic belt and the thickness of forearc continental crust, Geology, 41, 451–454,, 2013a. 
Aoya, M., Noda, A., Mizuno, K., Mizukami, T., Miyachi, Y., Matsuura, H., Endo, S., Toshimitsu, S., and Aoki, M.: Geology of the Niihama District. Quadrangle Series 1:50000, GSJ. AIST., Tsukuba, 181 pp., BB12998059, 2013b. 
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.