An earthquake with an estimated magnitude of from 4.5 to 4.8 took place Sunday afternoon near Vera Blanca in Heredia.
The epicenter was very deep, perhaps as much as 100 kilometers, but the region is heavily populated, said the Laboratorio de Ingeniería Sísmica at the Universidad de Costa Rica. Perhaps a million people live within 50 kilometers of the site, it noted.
The quake was at 4:52 p.m. and it was felt moderately in many locations in the Central Valley.
The Laboaratorio said the magnitude was 4.5 but the Observatorio Vulcanológico y Sismológico de Costa Rica at Universidad Nacional in Heredia, closer to the quake, said 4.8.
This is in the same general area that was hit by the Jan. 8, 2009, quake that killed at least 34 persons.