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The mechanically oscillating, due to tidal forces, lithosperic plateactivates, because of its high content in quartzite, the generation of apiezoelectric field. Due to the same mechanical oscillation the lithosphere isgenerally at a state of an oscillating stress load. Therefore, large EQs whichoccur at the peaks of the stress load must coincide with the peaks of thegenerated piezoelectric potential. In this work a physical mechanism ispostulated that accounts for the latter hypothesis. The postulated model isstatistically tested by comparing the time of occurrence of 280 large EQs(Ms>5.0R) which occurred during the period from 2003 to 2011, to the sameperiod of time Earth's electric field registered at ATH (Athens) and PYR(Pyrgos) monitoring sites located in Greece. The comparison has been made forthe oscillating component of T = 1 day and for both the E - W and N - Sdirections. The statistical results indicate that the postulated model does notbehave randomly. Instead, it represents a smooth normal distribution whichpeaks on the zero deviation in time between the time of occurrence of the largeEQs and the amplitude peaks of the Earth's oscillating electric field.Therefore, the proposed physical model is an acceptable one and can be used forthe finer refinement of the prediction of the occurrence time of a large EQwithin a day's time period.

The Earth's oscillating electric field (T = 1 day) in relation to the  occurrence time of large EQs (Ms>5.0R). A postulated theoretical physical  working model and its statistical validation