Country’s geology produced 3,900 earthquakes in 2011

Observatorio Vulcanológico y Sismológico de Costa Rica graphic Graphic shows the location (red dot) of felt earthquakes in 2001 in the Orosí de Cartago, Patarrá, Frailes and San Marcos de Tarrazú area. Blue stars are quakes since Nov. 1.

The country sustained 3,900 earthquakes in 2011, but most were not felt by the population. The Observatorio Vulcanológico y Sismológico de Costa Rica has released a report that also focuses on the flurry of quakes in the mountains south of San José. There were at least 200 quakes there in 2011.

There were three new quakes there New Year’s Eve, but the magnitudes were between 2.4 and 2.8. The quakes took place between 1:46 and 2:11 a.m.

An earlier quake at 1:16 a.m. took place in the mountains northwest of San Ramón.

The observatory said that some 92 quakes in 2011 could be classified as felt earthquakes. The month with the most felt quakes was July with 14.

The quake with the greatest magnitude, 5.9, was May 13 at 4:47 p.m. That took place six kilometers north of Santiago de Puriscal. The quake was felt all over the Central Valley. A quake July 12 registered a magnitude of 5.3. It was near Guacalito de Upala. It caused some slides in the vicinity of Volcán Miravalles.

Emergency officials have moved to increase their monitoring of the area bounded by Orosí de Cartago, Patarrá, Frailes and San Marcos de Tarrazú area. This is where several quakes are taking place each day.

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