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In this paper we study the energy of ULF electromagnetic waves that have beenrecorded by the satellite DEMETER, during its passing over Haiti before andafter a destructive earthquake. This earthquake occurred on 12/1/2010, atgeographic Latitude 18.46o and Longitude 287.47o, with Magnitude 7.0 R.Specifically, we are focusing on the variations of energy of Ez-electric fieldcomponent concerning a time period of 100 days before and 50 days after thestrong earthquake. In order to study these variations, we developed a novelmethod that can be divided in two stages: first we filter the signal keepingonly the very low frequencies and afterwards we eliminate its trend usingtechniques of Singular Spectrum Analysis, combined with a third-degreepolynomial filter. As it is shown, a significant increase in energy is observedfor the time interval of 30 days before the strong earthquake. This resultclearly indicates that the change in the energy of ULF electromagnetic wavescould be related to strong precursory earthquake phenomena. Moreover, changesin energy were also observed 25 days after the strong earthquake associatedwith strong aftershock activity. Finally, we present results concerning thecomparison in changes in Energy during night and day passes of the satelliteover Haiti, which showed differences in the mean energy values, but similarresults as far as the rate of energy change is concerned.

Enhanced ULF radiation observed by DEMETER two months around the strong 2010 Haiti earthquake