The sea floor southwest of Dominical continues to be the site of seismic activity.
A quake estimated at from 3.7 to 4.1 magnitude took place there at 1:57 a.m. Wednesday. This is the same location where a 5.9 or 6.0 quake took place at 4:57 a.m. Monday.
Since then there have been at least 50 smaller quakes like the one early Wednesday, said the Observatorio Vulcanológico y Sismológico de Costa Rica, at Universidad Nacional in Heredia. Most could not be felt by humans.
The Red Sismológica Nacional at the Universidad de Costa Rica said the quake early Wednesday was 33 kilometers (20.5 miles) southwest of Dominical on the central Pacific coast. The Red Sismológica estimated the magnitude at 4.1. The Laboratorio de Ingeniería Sísmica at the Universidad de Costa Rica said it was 3.7.
There were four significant quakes Tuesday in the same area. At 10 minutes after midnight there was a 3.8 quake. At 16 minutes after midnight a 3.3 quake hit. At 10:46 a.m. a 4.5 quake took place in roughly the same spot. Then at 11:12 a.m. Tuesday there was a quake on land at Damas north of Quepos with a 3.2 magnitude.
The Observatorio Vulcanológico y Sismológico said that subduction of the Coco tectonic plate was the cause of the quakes.
Also Tuesday, a 3.3 quake took place in the Caribbean 23.1 kilometers (about 14 miles) north east of Limón Centro.