Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3424305b&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 24, CiteID L24305
Physics
1
Seismology: Theory, Seismology: Transform Faults, Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242), Seismology: Mid-Ocean Ridges
Scientific paper
A model is proposed to explain the spatial distribution of foreshocks of the June 17th 2000, M s 6.6 earthquake in the South Iceland Seismic Zone (SISZ) and the high stress drop of the mainshock. Fluids of magmatic origin, ascending at near-lithostatic pressure through a low permeability layer perturb the regional stress field, inhibiting fluid flow laterally, where a high strength asperity is left. The asperity is modeled as elastic, embedded within a medium with low effective rigidity. Regional stresses due to tectonic motions are perturbed by the presence of the asperity, enhancing the production of hydrofractures and foreshocks in the NW and SE quadrants and increasing considerably the shear stress within the asperity, leading to the NS striking mainshock.
Bonafede Maurizio
Ferrari Cecile
Maccaferri F.
Stefánsson Ragnar
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