ИСТИНА

The results of the estimation of the Magnitude of Completeness Mc for the seismic data catalogue provided by the National Seismological Network of Colombia (RSNC), correspondingto the period 1993-2014 are presented. Mc corresponds to the minimum value of the magnitude of seismic events, which are registered without interruption, in certain region, during an interval of time. The variations of the values of Mcin time and with depth are analyzed. These results show that in time Mc decreases from 2.8 in 1993 and reaches its minmum Mc ~ |1.9 during 2010. After that we observe how Mc increases up to 2.3 inthe final part of the study period. The variations of Mc with the depth show a local maximum for depth ~ 40 km. This feature maybe associated to the fact that there is not enough seismic data corresponding to those depths, since in Colombia the seismic activityprincipallyhas its manifestation in shallow seismicity (H ≤ 30 km) and deep seismicity (H ≥ 80 km), so, the seismicity in intermediate depths is not so relevant. Anyway, in the end of the time of observation, the Mc values,according to the depth,are lower in comparison with these values in the beginning of the time of observation.