Some phenomena have been observed a very brief time before an intense earthquake: variations of the terrestrial magnetic and electric fields, rumble and also often animal nervousness. In order to give a sole explanation of all these phenomena, a general theory of the earthquake has been built, based on separation of the electric charges when the internal terrestrial masses are subject to strong compressive stress for piezoelectric effect. If the separation of the electric charges takes place on very large masses, intense electric fields are produced so to generate strong electric potential differences. If these differences are higher that the dielectric rigidity of the materials, a strong disruptive discharge can occur between the terrestrial masses. The destruction of some masses allows other masses to move generating intense seismic waves. The discharge produces the rumble and electromagnetic waves with frequencies depending on the dimensions on the focus. The tables show that the calculated frequencies (ultra-audible vibrations) are 35, 23, 17, 14, 12 kHz. (This abstract was published on Bulletin of S.I.F. on 10 September 1982, N. 127).
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