Swarm of quakes keeps the ground shaking near Vara Blanca

Quake experts say that the Vara Blanca region in Heredia experienced an even dozen seismic events Tuesday morning between 2:51 and 6:08 a.m.

The most significant was one at 3:09 a.m. that was felt in much of the central part of the country.

The Red Sismológica Nacional said that the quakes ranged from that 5.0 magnitude quake at 3:09 a.m. to one at 2.3 magnitude at 6:09 a.m. The Red called 10 of the quakes aftershocks. The cause was believed to be a local fault system.

A.M. Costa Rica reported the 3:09 a.m. quake to be 4.7 magnitude in Tuesday’s newspaper based on an estimate from the Laboratorio de Ingeniería Sísmic at the Universidad de Costa Rica. Several agencies having slightly different estimates is not unusual.

The Laboratorio also reported another quake at 11:05 a.m. This was estimated at 4.5 magnitude. The epicenter was reported to be 10.4 kilometers northeast of Zapotal de San Ramón. There also were several moderate quakes in the 4.5-magnitude range off the northwestern coast of Costa Rica Tuesday.

The Red reported 353 quakes in March, but most were not strong enough to be felt by humans. One was March 18 just seven kilometers east of Vara Blanca. That was estimated at 3.7 magnitude.

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