Temporal variation estimates of apparent resistivities associated with occurrence of seismic activity around Bogotá - Colombia using MT records from the RSUNAL seismic network

This work allowed us to estimate the space-time variations of the apparent resistivity (AR) at the USME station of the Red Sismológica de la Universidad Nacional de Colombia (RSUNAL), located in the center of Colombia at the Eastern Cordillera, and correlate these changes with seismic activity within a radius of 500 km to the station.

This project used recorded time series of the natural earth’s electric and magnetic field, processed its data with a computational algorithm of our own (which follows the magnetotelluric (MT) method’s fundamentals), and yielded positive results for the 6.1 Mw earthquake of December 24th, 2019 in Mesetas (Meta - Colombia) with some anomalies registered 8 hours before the mainshock. Although there is just one abnormal behavior for 1 of 5 study cases, it is seen in a good way a possible relation between the magnitude of the event and the AR anomaly as an input to the study of seismic precursors.