Abstract
Abstract. Here, we investigate whether the bulk or the shear is the appropriate modulus for the defect parameters in different materials by focusing on those of geophysical interest. We show that the self-diffusion process and just also the bulk modulus should be related to defect parameters. It is this interrelation which accounts for the emission of electric signals before fracture, and is thus in accordance with the physical basis of the Seismic Electric Signal prior to earthquakes in Greece.
Highlights
During the last 3 decades, low frequency (≤1 Hz) transient changes of the Earth’s electric field, termed Seismic Electric Signals (SES), have been found to precede major earthquakes in Greece (Varotsos and Alexopoulos, 1984a, b; Varotsos et al 1986, 1988, 1993b )
Zhang et al (2011) investigated the temperature and pressure dependence of oxygen self-diffusion coefficients in a variety of materials of geophysical interest such as Mg2SiO4 polymorfs and MgSiO3 perovskite. They found that the activation energy as well as the activation volume are directly related to the bulk modulus through the cB model (Varotsos and Alexopoulos, 1986), of which a brief description will be given below
We have checked whether the bulk or shear modulus is related to defect parameters focusing on materials of geophysical interest
Summary
During the last 3 decades, low frequency (≤1 Hz) transient changes of the Earth’s electric field, termed Seismic Electric Signals (SES), have been found to precede major earthquakes in Greece (Varotsos and Alexopoulos, 1984a, b; Varotsos et al 1986, 1988, 1993b ). Zhang et al (2011) investigated the temperature and pressure dependence of oxygen self-diffusion coefficients (see below) in a variety of materials of geophysical interest such as Mg2SiO4 polymorfs (forsterite, wadsleyite and ringwoodite) and MgSiO3 perovskite They found that the activation energy as well as the activation volume are directly related to the bulk modulus through the cB model (Varotsos and Alexopoulos, 1986), of which a brief description will be given below. We check whether in various defect processes the shear or the bulk is the appropriate elastic modulus for the interconnection of the defect parameters with the bulk properties focusing on materials prevailing in the Earth’s mantle and of geophysical interest
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