Abstract

ARROYO, Mario; GODINEZ, Kevin  and  LINKIMER, Lepolt. COMPLETENESS OF THE COSTA RICA NATIONAL SEISMOLOGICAL NETWORK CATALOG DURING 1975-2014. bol.geol. [online]. 2017, vol.39, n.3, pp.87-98. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v39n3-2017006.

This study evaluates the stability of the mean earthquake occurrence rate and the temporal distribution of seismicity in Costa Rica from the Stepp method, in order to determine the completeness magnitude of the seismic catalog of the National Seismological Network (RSN) and the Gutenberg-Richter relationship for the period 1975-2014. The catalog was filtered using several criteria and homogenized to moment magnitude (Mw). The magnitude of completeness obtained for the entire catalog is 5.0, but it could be as low as 3.0 for certain periods of time. These results show the improvement in seismic detection due to the change from analogue to digital systems since 1990 and the considerable increase in the number of stations since 1995. The value b obtained for this catalog is 0.96, which is very similar to regional b values obtained in previous studies, nevertheless, the limitations discussed in this paper have to be considered in order to interpret this value.

Keywords : completeness magnitude; seismicity of Costa Rica; Stepp method.

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