Resumen

En el siguiente trabajo se analiza el comportamiento y las posibles causas de la sismicidad ocurrida al norte de la provincia de Villa Clara en enero de 2014. El análisis de los parámetros espacio-temporal-energéticos evidenció la coherencia entre los resultados dados por tres de las redes sismológicas que monitorean la región de EEUU, Alemania y Cuba. Dos tensores del momento sísmico del evento principal fueron calculados en este estudio, con el empleo de dos modelos de velocidades diferentes. Los resultados de ambos fueron similares y son coherentes con los dados por otras agencias y evidencian planos de falla con orientación NW-SE y con mecanismos de falla normal, lo que refleja la acción de fuerzas distensivas. El comportamiento de las réplicas registradas, que sigue la Ley de Omori, es otro elemento que pudiera contribuir a la hipótesis de un origen tectónico del evento.

Palabras clave: Cuba, Sismicidad, réplicas, tensor del momento sísmico

Seismic activity evaluation started on January 9th, 2014 in Corralillo, Villa Clara province, Cuba

Abstract

An evaluation of the infrequent seismic activity reported on January 9th 2014 in Corralillo, Villa Clara province, Cuba, was done using the seismic data recorded and the geological information available. The main information of the earthquakes parameters from the three used sources (from Cuba, the USA and Germany) were consistent. Two seismic moment tensors of the main earthquake were calculated using different velocity models and both results were consistent but the uncertainty was less using the model belonging to the closest station to the epicenter. These results were also consistent with those from other networks, and they evidence that the fault plane is NW-SE oriented and has normal faulting. These forces are well represented as a double-couple and the temporal behavior of the aftershocks, that follows Omori’s law, may indicate that the seismic event has a tectonic origin, even though the epicentral region is close to the oil exploration zone.

Key words: Aftershocks Cuba, Seismicity, seismic moment tensor