The area near the Irazu volcano is characterized by several local faults active, being present in other seismic swarms as in 2010, 2012, and May 2015. In January 2012, several earthquakes are located near San Juan de Chicua, Carthage of less than 2.5 M and depths less than 5 km.
During 2015 were reported three earthquakes felt, located south of the crater of the volcano Irazu, from local faults, the first at 9:52 on January 2, M 2.7, the second on February 11th at 9:25 to 2.3 M and the last on May 7 at 3:26 p.m., M 2.0; these shallow earthquakes of 0-5 km deep.
Between the Friday, July 17 and Saturday, July 18, 2015, there was a new earthquake swarm that started at 11:44 p.m. pm Friday. During the twelve hours that followed, the region recorded more than 400 aftershocks of magnitude ranging between M 1 and M 3.2. These earthquakes have depths between 1 and 5 km. There have been reports from villages mainly north of Carthage as Cot, Pacayas, Llano Grande and San Juande Chicua indicating they felt more of these earthquakes overnight.
The OVSICORI as always, maintain its vigilance on these seismic swarms.
July 19, 2015. Irazu , Costa Rica :
Source : Ovsicori , Walter Jiménez.
Photo : costa-rica-guide.com .