A 4.4-magnitude quake took place off Jacó at 6:49 p.m. Sunday, said the Red Sismológica Nacional. There also was a 4.3 quake in the same area at 11:31 p.m. and a smaller 2.5-magnitude aftershock there at 1:01 a.m. today.
The Laboratorio de Ingeniería Sísmica at the Universidad de Costa Rica estimated the 6:49 p.m. quake at 4.2 magnitude.
The locations were some 14 to 20 kilometers southwest of Jacó in the open ocean. That area contains local faults and also is subject to subduction quakes.
There also was a 4.6-magnitude quake at 9:20 p.m. 78 kilometers south of Quepos, also in the open ocean, said the Red Sismológica Nacional.