Predictions for processes preparatory to earthquakes based on an inclusion model of faulting are reviewed. The inclusion material is assumed to have properties representative of the response of brittle rock in compression. Strain softening of the inclusion material leads to a dynamic runaway of inclusion shear strain which is interpreted as the occurrence of an earthquake. For both dry and fluid-saturated rock masses, the model predicts during which the rate of inclusion strain accelerates relative to the far-field strain rate. However, in a fluid-infiltrated rock mass, the coupling of the deformation with pore fluid diffusion causes a much more pronounced period of accelerating inclusion strain and delays the onset of instability beyond its occurrence in a dry rock mass. The results for stabilization by dilatant hardening are shown to be consistent with recent laboratory experiments.
|Number of pages
|American Society of Mechanical Engineers, Applied Mechanics Division, AMD
|Published - Jan 1 1980
|Solid Earth Geophys and Geotechnol, Presented at the Winter Annu Meet of ASME - Chicago, IL, USA
Duration: Nov 16 1980 → Nov 21 1980
ASJC Scopus subject areas
- Mechanical Engineering