Among these were earthquakes of a magnitude of 6.0 and 5.7 that took place to the south in Panamá but still were felt by persons living in the national territory.
In all there were 163 quakes registered in Costa Rica during the month, said the Red Nacional. That was 22 fewer than in May, the agency noted.
No particular region has a lock on earthquakes. The Red Nacional said that there were quakes west of the Nicoya peninsula, in the central volcanic mountains, near the volcanoes of Irazú and Turrialba, the Talamanca mountains in the south and the Caribbean coast in the east.
There also were quakes in the Guanacaste mountains and near Lake Arenal.
There were 11 quakes with a magnitude of from 4.0 to 4.8.
The Red Nacional keeps daily statistics, so quake experts there can report that June 9 was the most active day with 12 quakes.
The Red Nacional’s statistics are not the same as other earthquake reporting agencies because each uses different technology.
Even the Laboratorio de Ingeniería Sísmica that also is based at the Universidad de Costa Rica sometimes registers quakes that are not reported by the Red Nacional. For example, for Monday, the Laboratorio reported four quakes, but only one had a magnitude of 3.1. Others had magnitudes that ranged from 2.5 to 2.6.
The strongest quake had an estimated epicenter 11 kilometers northeast of Guacamaya de Carrillo in Guanacaste. Others had epicenters in Santa Cruz, Tilarán and on the canton of Osa in the central Pacific.