An earthquake estimated at from 4.7 to 4.8 magnitude made itself known over most of the country last night at 7:31.
The quake had a short duration of about 10 seconds in the Central Valley. Elsewhere it lasted more than a minute, according to the instrumentation online at the Observatorio Vulcanológico y Sismológico de Costa Rica.
The quake was centered 7 kilometers (4.4 miles east of Las Juntas de Abangares, according to the observatory.
The U.S. Geological Survey placed the epicenter about 100 kilometers (60 miles) west northwest of San José and 30 kilometers (20 miles) north northwest of Puntarenas.
Both agencies agreed that the quake was deep. It was about 58 kilometers or 36.5 miles, said the Geological Survey. The cause was the subduction of the Cocos tectonic plate beneath the Caribbean plate.