ORCID Profile
0000-0003-1053-8536
Current Organisation
Université de Genève
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Publisher: American Geophysical Union (AGU)
Date: 06-2020
DOI: 10.1029/2019JB018453
Publisher: Elsevier BV
Date: 05-2023
Publisher: Springer Singapore
Date: 20-11-2018
Publisher: Springer Science and Business Media LLC
Date: 03-08-2020
DOI: 10.1038/S41467-020-17609-3
Abstract: In subduction zones, landward dipping regions of low shear wave velocity and elevated Poisson’s ratio, which can extend to at least 120 km depth, are interpreted to be all or part of the subducting igneous oceanic crust. This crust is considered to be overpressured, because fluids within it are trapped beneath an impermeable seal along the overlying inter-plate boundary. Here we show that during slow slip on the plate boundary beneath southern Vancouver Island, low frequency earthquakes occur immediately below both the landward dipping region of high Poisson’s ratio and a 6–10 km thick shear zone revealed by seismic reflections. The plate boundary here either corresponds to the low frequency earthquakes or to the anomalous elastic properties in the lower 3–5 km of the shear zone immediately above them. This zone of high Poisson’s ratio, which approximately coincides with an electrically conductive layer, can be explained by slab-derived fluids trapped at near-lithostatic pore pressures.
No related grants have been discovered for Ritvik Chauhan.