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Dislocation dynamics and related electromagnetic excitation

Teisseyre R.

Acta Geophysica Polonica

2001

Vol. 49, nr 1

55-73

Theory of stress and dislocation evolution is based on the equation of motion for the self-stresses on the slip-fault plane; this equation is supplemented with the source/sink function entering in a similar way as the body forces in the equation of motion for displacements. We present the effects of dislocation dynamics on generation of electric current and electromagnetic field emission.

Stress and dislocation field evolution and prediction problems of numerically simulated events

Teisseyre R., Yamashita T.

Acta Geophysica Polonica

2000

Vol. 48, nr 1

43-56

Numerical simulations of the dislocation density evolution exhibit some perturbations which may be identified as seismic events. The influences of tidal stresses and random disturbances related to the material heterogeneities are analyzed. In relation to this analysis some problems of earthquake prediction and earthquake precursors are discussed. Occurrences of seismic events are very sensitive to small disturbances, while the great disturbances in tidal influence or in material properties cause the disappearance of the events.

Thermodynamics of line defects and transient electric current: electromagnetic field generation in earthquake preparation zone

Nagahama H., Teisseyre R.

Acta Geophysica Polonica

1998

Vol. 46, nr 1

35-54

In thermal equilibrium the electrical neutrality of the charge dislocation is assured by a cloud of oppositely charged point defects around it. Here, from the view point of thermodynamics of line vacancies, we propose a possibility of constructing a model of transient electric current generation in an earthquake source zone which combines polarization processes and motion of charged dislocations under the influence of evolving field of stresses. This transient electric current differs essentially from the piezo-electric current in which the electric field is proportional to the stress itself. Then we review briefly the elements of stress evolution theory. Some examples of the stress evolution pattern with the electromagnetic field radiation are shown.