Electromagnetic anomalies recorded before the earthquake of L'Aquila on April 6, 2009

Electromagnetic signals with frequencies from 10 to 100 Hz were recorded for four days before the earthquake of L'Aquila on April 6, 2009. Immediately before the earthquake, during the three and a half hours immediately preceeding the quake, the system detected also an increase of the electromagnetic emissions, with frequencies from 1 to 5.5 kHz. The radio receiving system was located ~10 kilometres from the epicenter, it was turned on April 2 and it recorded electromagnetic signals for up to two seconds immediately after the main shock when a power cut occurred. The low frequency emissions and the detected variation of the signals recorded in the higher frequency range are two anomalies that appeared before the earthquake of L'Aquila (M=6.3) and for this reason they could be related to this seismogenic process.