The Wednesday afternoon earthquake near San Isidro de El General generated 10 smaller quakes in the 1.5 to 2.5 magnitude range, according to the Observatorio Vulcanológico y Sismológico de Costa Rica. The initial quake that took place at 4:25 p.m. was estimated at a magnitude of 4.4, said the observatory.
Most of the repeated quakes after the initial one probably were too weak to be felt by humans. They took place over an hour, said the observatory.
A 4.2 magnitude quake took place 11 kilometers or about 7 miles south of Liberia at 10 a.m. Saturday.
There have been no reports of major damage.
Residents near Higuito de Desamparados south of San José may have felt a 2.5 quake about 10:02 p.m. Thursday. The observatory said this quake, the quake in San Isidro and the one in Liberia all were the result of movement in local faults. That means they were not generated directly by the collision of tectonic plates beneath the county that is the source of major earthquakes.