Two quakes rattled the southern part of the country Monday. The first, at 1:12 a.m. was 13 kilometers (8 miles) southwest of Jacó in the Pacific. The magnitude was estimated at 4.8 by the Observatorio Vulcanológico y Sismológico de Costa Rica at Universidad nacional in Heredia. The quake was attributed to subduction of the Coco tectonic plate beneath the Caribbean plate.
A second quake at 8:32 a.m. was estimated at 3.8 magnitude. It was attributed to a local fault some 10 kilometers (6 miles) northeast of Pérez Zeledón.