Two quakes within six minutes of each other came from difference sources, said geological experts.
The first was at 12:21 p.m. Sunday about 22 kilometers (14 miles) south of Jacó and 52 kilometers (32 miles) west of Parque Nacional Manuel Antonio. The intensity was strongest in Jacó. The estimated epicenter was in the Pacific ocean.
The Red Sismológica Nacional attributed this quake to the subduction of the Coco tectonic plate under the lighter Caribbean plate on which Costa Rica rides. The magnitude was estimated at 3.8.
The second quake was at 12:27 p.m. had an epicenter estimated to be some 5 kilometers northeast of San Isidro de Coronado. The cause, according to the Red Sismológica Nacional, was a local fault. The magnitude was 3.8, said the Red.
Red Sismológica Nacional said that it is common for quakes form various sources to take place on the same day. The country averages 18 quakes a day but most are not felt by humans, the Red said.