How do P and S - tectonic waves influence the
In accordance with much research and the rated models of different authors, the tectonic wave, similar to the seismic wave, has compressional and transverse components. Fig.1 shows the model of a possible mechanism of non-spherical tectonic wave propagation by an earthquake source.
The compressional tectonic wave propagation causes alternating changes of rock density in a large stratum of the lithosphere, along the direction of wave movement, Fig. 2. Successive compression and expansion of the lithosphere in the field of the passing condensational wave causes an alternating increase and decrease of the mass of the rocks under the registering stations. Therefore, the ATROPATENA stations register the alternating changes of gravity acceleration, as is shown in the model, Fig. 1.
Fig. 1. Model of influence of compressional tectonic wave on alternate changes of
rock density and the corresponding variations of gravity.
1-5 - the registering stations ATROPATENA.
Movement of transverse tectonic waves causes alternating changes of rock density in a large stratum of the lithosphere, perpendicular to the direction of wave propagation, Fig. 2. The successive alternate compression and expansion of lithosphere in the field of the passing transverse wave, causes an alternating increase and decrease of the mass of the rocks from different sides from the registering stations. Therefore, the ATROPATENA stations register the alternating changes of the gravitational field in two perpendicular horizontal directions, as is shown in the model, Fig. 2.
Fig.2.2 Model of influence of the transverse tectonic wave on variations of changes of the density of rocks in horizontal direction.
Thereby, the physical mechanism of influence of tectonic waves on the gravitational field of the Earth, to our opinion, is logically and convincingly substantiated. This mechanism can explain all existing harbingers of earthquakes of gravitational character: long-period three-dimensional variations of gravitational field, tideless variations of gravity, seismic-gravitational effects, variations of gravitational gradient, etc.
Meanwhile, there is also a logical explanation of the mechanism of influence of tectonic waves on geochemical characteristics of the geological medium, including hydro-geochemical, gas-geo-chemical ones, and others.