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Electrical spectroscopy of porous rocks: a review—I. Theoretical models
The complex dielectric permittivity e* of porous water-bearing rocks in the frequency range from a few to hundreds of megahertz reveals several intensive relaxation effects and a non-trivialExpand
Electrical spectroscopy of porous rocks: a review—II. Experimental results and interpretation
SUMMARY In the frequency range from millihertz to hundreds of megahertz, many diVerent physical and physico-chemical processes contribute to the electrical polarization of porous water-bearing rocks.Expand
Electromagnetic signature of prefracture criticality in heterogeneous media.
The analysis reveals characteristic signs of approaching the CP: the emergence of memory effects; the increase of the spatial correlation; the decrease of the antipersistence behavior; the appearance of persistence properties in the tail of the precursors, a loss of multifractality, and the divergence of the energy release rate. Expand
The Digital Accelerograph Network in the Caucasus
The paper describes the permanent digital accelerograph network in the Caucasus area operated by the National Survey for Seismic Protection of the Republic of Armenia, the Georgian Academy ofExpand
Microstructures, percolation thresholds, and rock physical properties
Abstract The physical properties (transport properties and mechanical properties) of porous/cracked rocks are mainly functions of their microstructure. In this connection the problem of criticalExpand
Elastic wave velocities in partially saturated rocks: Saturation hysteresis
An effective medium approach (differential self-consistent scheme) has been used to calculate elastic wave velocities in rocks containing spherical pores and ellipsoidal cracks with two fluid phases.Expand
Magnitude of velocity anomalies prior to earthquakes
A model is presented which allows us to reexamine the interpretation of velocity anomalies observed before some earthquakes occur. This model extends the well-known dilatancy models by accounting forExpand
Seismic hazard assessment for the Caucasus test area
The GSHAP CAUCAS test area was established under the INTAS Ct.94-1644 (Test Area for sismic Hazard Assessment in the Caucasus) and NATO ARW Ct.95-1521 (Historical and Prehistorical Earthquakes in theExpand
Non-extensive statistical analysis of seismicity in the area of Javakheti, Georgia
The distribution of earthquake magnitudes in the Javakheti highlands was analyzed using a non-extensive statistical approach and decreases of energy density characteristic a may point to a prevalent contribution of large size fragments to fragment-asperity interaction under the influence of a rapidly released stress, as opposed to relatively quiet periods when accumulated stress energy is supposedly released through the relative movement of smaller fragments. Expand