Deep downward fluid percolation driven by localized crust dilatation in Iceland

Deep downward fluid percolation driven by localized crust dilatation in Iceland 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Deep downward fluid percolation driven by localized crust dilatation in Iceland

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Publisher
Wiley
Copyright
Copyright © 2008 Wiley Subscription Services
ISSN
0094-8276
eISSN
1944-8007
D.O.I.
10.1029/2008GL034514
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Geophysical Research LettersWiley

Published: Jan 1, 2008

Keywords: ; ;

References

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