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Epicentral deformation based on the dilatancy-fluid diffusion model

INSTITUTO DE GEOFISICA UNIVERSIDAD NAL. AUTONOMA DE MEXICO, C.U., MEXICO 20, D.F.
INSTITUTO DE INGENIERIA UNIVERSIDAD NAL. AUTONOMA DE MEXICO, C.U., MEXICO 20, D.F.

Abstract

The dilatancy-fluid diffusion model of the earthquake mechanism implies deformation of the epicentral area. Based on a result in the theory of thermoelasticity, we present a method for computing such deformation. Details are given for a dilating sphere and a dilating infinite cylinder buried in an elastic half-space. Given the volumetric strain of the dilatant region, the deformation measurements could be used to estimate the magnitude of the impending earthquake. Alternatively, a constraint on the volumetric strain can be obtained from deformation measurements before earthquakes that are preceded by dilatancy.