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Deep downward fluid percolation driven by localized crust dilatation in Iceland
Author(s) -
Geoffroy Laurent,
Dorbath Catherine
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl034514
Subject(s) - crust , geology , seismology , brittleness , oceanic crust , percolation (cognitive psychology) , petrology , continental crust , mantle (geology) , tectonics , geophysics , subduction , physics , neuroscience , biology , thermodynamics
From a detailed seismic survey on a transform‐like plate setting in Iceland, we propose a spatial relationship between highly deformed crustal columns and areas of low Vp/Vs ratio, which are best explained by high fluid pressures at the base of the seismogenic crust. Combined with geological observations, our seismic data suggest transient and local increases in crust permeability at specific highly dilating areas triggered by dynamical stresses from high‐magnitude regional earthquakes. Fluids are then trapped at supercritical conditions in the deep brittle crust which, in turn, increases the capacity of the rocks to deform through cracking and faulting.