Journal
HYDROGEOLOGY JOURNAL
Volume 20, Issue 8, Pages 1463-1466Publisher
SPRINGER
DOI: 10.1007/s10040-012-0901-z
Keywords
Earthquake; Groundwater monitoring; Geophysical methods; Fractured rocks
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The injection of fluid into a rock mass results in variations of effective stresses that sometimes generate induced seismicity. These effective stress field variations depend on the diffusion process, which depends, in turn, on the magnitude of the pore pressure variation relative to the total stress. Four diffusion mechanisms are distinguished: diffusion through a poroelastic rock mass, and diffusion in preferential directions controlled either by slip along preexisting fractures, or by the development of fresh shear zones, or by hydraulic fracturing. More importantly, in some instances, this diffusion process also generates non-seismic motions that, in turn, influence the seismic activity, in particular when injection stops.
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