The Red Sismológica Nacional estimated the epicenter to be south of Costa Rica in Panamá. Still the Laboratorio de Ingeniería Sísmica said its instruments showed that the quake was felt all over Costa Rica except in northwest Guanacaste.
The area around Sixaola on the southern Caribbean coast felt the quake the strongest along with a sensor in San Isidro de El General and also a sensor in Cartago. The intensity has a lot to do with the composition of the soil beneath an area, experts have noted in the past.
The quake took place at 3:42 a.m. and much of the Central Valley rocked for at least a minute. Instruments at the Observatorio Vulcanológico y Sismológico de Costa Rica at Universidad Nacional in Heredia showed that the quake endured for about 3.5 minutes in some areas.
There were no immediate reports of damage, but the magnitude of the quake suggest there may have been some in Panamá and in southern Costa Rica.