Deep downward fluid percolation driven by localized crust dilatation in Iceland

Details Deep downward fluid percolation driven by localized crust dilatation in Iceland Deep downward fluid percolation driven by localized crust dilatation in Iceland

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517302g&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17302

Mathematics

Logic

4

Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Mid-Ocean Ridges, Seismology: Tomography (6982, 8180), Structural Geology: Role Of Fluids, Physical Properties Of Rocks: Permeability And Porosity

Scientific paper

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.

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