January provided lots of tremors in Costa Rica. The strongest recorded was on January 31st, near the Osa Peninsula. It was recorded at a magnitude of 5.4.
The subduction of plates and faults and volcanic failures are to blame, according to the reports by both the National Seismological Network and the Volcanological and Seismological Observatory of Costa Rica.
The RSN detected 209 earthquakes in January and Ovsicori recorded 365. The difference is because each organization depends on a different number of stations installed and has different groups of people reporting earthquakes. Ovsicori has a wider network.
Both organizations agree on certain points both on the mainland and under the sea that generate a lot of seismicity. There has been subduction of the Coco plate under the Caribbean plate. There is also a lot of activity near the Irazú and Turrialba volcanoes.