It can be assumed that the effect of luni-solar attraction depends, to a certain extent, upon the geological structure. For instance, this effect should not be equal on the two sides of a fault separating rocks of different densities and competencies. If, on two geologically different blocks separated by a fault, two different values of the earth tidal motion can be measured, there is an earth tidal anomaly evidencing the presence of the fault. In other words, measuring and comparing earth tidal motions can be considered as a new geophysical prospecting method.

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