Detection of electromagnetic earthquake precursory signals in Greece

Electromagnetic (EM) anomalies were detected in a nide frequency band prior to the two strongest earthquakes that occurred in Greece during 1995, i.e. , at Kozani-Grevena and Egio-Eratini areas. The analysis of these se EM ano malies indicates that these EM anomalies should be pre-seismic ones. Two ba sic characteristics emerged: (i) The lead time of each disturbance was syst ematically smaller in the case of Kozani-Grevena earthquake than that of th at Egio-Eratini earthquake. (ii) An almost simultaneous cessation of the EM anomalies, although they had different onset times and were detected in a wide frequency range. As for the seismic activity that occurred in Greece d uring the last year, pre-seismic EM anomalies were detected before (i) the September 7, 1999, Athens eearthquake and (ii) other smaller EQs. The possi bility to predict, the parameters of an impending EQ from the EM anomalies is also investigated.