Investigating the inner time properties of seismograms by using the Fisher Information Measure

The time dynamics of seismograms of nine tectonic earthquakes which occurred in Vrancea (Romania) registered at three seismic stations located in Moldova are analyzed by means of the informational approach of the Fisher Information Measure (FIM). The three seismic stations in Moldova are located, two (MILM and LEOM) within an area with high seismic hazard, while the third (SORM) in a less hazardous region. Our findings point out to a clear discrimination of the two stations MILM and LEOM from SORM on the basis of the informational properties of the recorded seismograms corresponding to the same earthquakes. In particular it is found that larger distance and lower azimuth characterize seismograms with lower FIM, which implies lower organization and higher disorder in seismograms recorded by SORM with respect to those recorded by MILM and LEOM. The lower FIM revealed by seismograms recorded by SORM could be put in relationship with the lower degree of seismic hazard in the area where the seismic station is installed.