Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.181..343d&link_type=abstract
Geophysical Journal International, Volume 181, Issue 1, pp. 343-356.
Astronomy and Astrophysics
Astronomy
2
Permeability And Porosity, Fracture And Flow, Seismicity And Tectonics, Europe
Scientific paper
Reservoir-induced seismicity was observed in 2004 after the impoundment of the Itoiz Reservoir in the central-western Pyrenees, Spain. Subsequent annual filling cycles were accompanied by large epicentral growth in the northern part of the Jaca-Pamplona basin. Based on the evaluation of the available geohydrologic data, we suggest that the seismicity is associated with the diffusion of increased pore pressures along the carbonate megabreccia systems of the Early to Middle Eocene age Hecho Group. Assuming 1-D pore-pressure diffusion from the Itoiz Reservoir, we estimate that excess pore pressures of ~100-500 kPa are adequate to induce M >= 3.0 earthquakes in this geological terrane. The results of this study have potential applicability in regions where reservoirs are built over karst terranes.
Durá-Gómez Inmaculada
Talwani Pradeep
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