One of the quakes was estimated at a healthy 4.8 magnitude and was listed among such events by the U.S. Geological Survey. It was one of three that took place at nearly the same point about 30 kilometers (19 miles) off the Pacific coast at Dominical.
The strongest of the three quakes was the first, and it took place at 2:43 p.m. Saturday, according to the Observatorio Vulcanológico y Sismológico de Costa Rica, which estimated the magnitude slightly less at 4.5.
A second quake took place Sunday at 12:41 p.m. The magnitude was estimated at 3.1. Less than an hour later at 1:39 p.m., the third quake of 3.4 magnitude took place.
The Observatorio Vulcanológico y Sismológico reported another quake that took place Sunday. This one was farther west in the Pacific, about 194 kilometers (about 120 miles) southeast of Puerto las Playa de Golfito. The magnitude was estimated at 4.5.
Another Sunday quake took place off the northern Pacific coast. That was at 5:03 p.m. The epicenter was estimated to be some 67.2 kilometers (about 42 miles) west of Tamarindo. The magnitude was set at 4.4 by the Laboratorio de Ingeniería Sísmica at the Universidad de Costa Rica.
An other quake took place further south and just five minutes later at 5:08 p.m., according to the Laboratorio. The magnitude was estimated at 3.7. The epicenter was about 30 kilometers (about 19 miles) off the coast and north of the Osa Peninsula.
That is roughly the same location as the three quakes Saturday and earlier Sunday.
There were no reports of damage from the sea quakes, and the earthquake watchers said most persons along the Pacific coast did not feel them. Most of the data comes from automatic sensing stations.