Impact of bending-related faulting and oceanic-plate topography on slab hydration and intermediate-depth seismicity
نویسندگان
چکیده
Abstract It is commonly assumed that intermediate-depth seismicity in some way linked to dehydration reactions inside subducting oceanic plates. Although there growing evidence the hydration state of an plate controlled by its structure and degree faulting, we do not have a quantitative understanding this relationship. Double seismic zones offer possibility investigating changes oceanic-plate only along strike but also with depth beneath slab surface. To quantify impact faulting on seismicity, focus genesis double zones, correlate high-resolution earthquake catalogs seafloor maps ship-based bathymetry for northern Chilean Japan Trench subduction zones. The correlations show weak influence upper plane zone, which may imply limited slow reaction kinetics at low temperatures 5–7 km below finite amount exposed wall rock outer-rise region. These factors seem limit even if abundant water available. Seismicity lower is, contrast, substantially enhanced where deformation high distributed across intersecting faults. This likely leads increase volume damaged around faults, thereby promoting circulation mantle depths serpentinization faster due elevated temperatures. Increased lower-plane features such as seamounts or fracture be caused these features. Our results provide possible explanation globally observed presence rather homogeneous upper-plane well patchy inhomogeneous distribution seismicity.
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ژورنال
عنوان ژورنال: Geosphere
سال: 2022
ISSN: ['1553-040X']
DOI: https://doi.org/10.1130/ges02367.1