Changes of the Local Microgravity Before Seismic Events, Rovigo (Italy)

This study discusses the analysis of two earthquakes that occurred on the border between Slovenia and Croatia on March 22, 2020, of magnitude 5.3 and 4.9, respectively. The epicenters were not far from each other and with the hypocenter located 10 km away. The microgravitational variations with the graph of a seismograph supplied in the same monitoring station, located in Rovigo in northeastern Italy, before, during, and after the earthquakes were compared. The comparison of the graphs shows that the first earthquake was preceded by a microgravitation variation of about 5 milliGal before the main shock of magnitude Mw 5.3 by about 32’. However, the local microgravity change was not recorded by the seismograph, nor was the damped gravitational wave that followed. We can deduce that it was a variation of the local gravity, not influenced by the passage of the seismic waves which preceded the earthquake. The amplitude of the damped waves is also compatible with the energies of the two earthquakes and is comparable with the Magnitude Scale.