"Short-term time prediction" of large EQs by the use of "Large Scale   Piezoelectricity" generated by the focal areas loaded with excess stress load
  In this work, it is demonstrated that the Earth's preseismic electric field, which is registered by a pair of electrodes in contact to the ground surface at certain distance from the epicentral area, corresponds to the gradient of the total field generated in the focal area as a function of time and distance from it. The original form of the generated preseismic field follows closely the theoretical piezoelectric potential form. The later is obtained after integration in time of the original registered potential grad data values. Consequently, the time of occurrence of the imminent earthquake (collapsing of the rock formation) is estimated by the classical laws of rock fracturing based on theoretical Rock Mechanics. The methodology has been tested on the grad potential data, registered in Greece, before four large EQs which took place in the regional area as follows: Izmit, Turkey EQ (M = 7.8R, 17th August, 1999), Milos, Greece EQ (M = 5.6R, 21st May, 2002), Kythira Greece EQ (M = 6.9R, 8th January, 2006) and Methoni, Greece EQ (M = 6.7R, 14th February, 2008). The obtained results prove the validity of the postulated methodology. 
C. Thanassoulas