Schumann Resonance anomalies possibly associated with large earthquakes in Mexico

Abstract

Using Schumann Resonance (SR) data of a station located in Mexico, we analyzed anomalies in frequency and amplitude of the first three SR harmonics within a window of 21 days, 15 days before and 5 days after, of 12 earthquakes of magnitude M > 5 that occurred in the Mexican Pacific coast. The period of study was from June 2013 to May 2018. In order to avoid SR anomalies likely produced by solar activity, we discarded periods with solar proton events; also, we distinguished three levels of geomagnetic activity (low, medium and high). We found either positive or negative statistically significant anomalies in frequency and amplitude around the day of the seismic event. However, a study of anomalies in periods of earthquakes of magnitude lower than M > 5 and quiet solar activity conditions also shows statistically significant anomalies. Therefore, these results concerning the presence of SR anomalies around the time of earthquakes in Mexico using the Mexican SR station data are not conclusive.