From Shiretoko Cape at the tip of the peninsula, a series of volcanoes run down the peninsula, including Mount Shiretoko, Mount Unabetsu, and Mount Iō. (wiki)

"The second unique attraction in Ujung Kulon is the Krakatau volcano. This is one of many hundreds of volcanoes in the Pacific "ring of fire" that extends virtually around the Pacific ocean"(AB ev)

"The northern coastal region of California, which includes RNSP and the adjacent offshore area, is the most seismically active in the U.S. Frequent minor earthquakes in the park and offshore under the Pacific Ocean have resulted in shifting river channels, landslides, and erosion of seaside cliffs." - wiki

in general, the Costa Rican territory is in the Pacific Ring of Fire and is subject to earthquakes and volcanic eruptions. As such, the territory was formed because of the subduction of the Cocos plate under the Caribbean plate, forming the existing mountain ranges. The Guanacaste CA has one of the -considered- active volcanoes. Additionally, the Cocos Island NP is the highest point on the Cocos submarine mountain range, on the Cocos plate, has an extinct volcanic mount (Iglesias peak) and will eventually subduce under the Costa Rican territory.
See lh4.googleusercontent.com

highly active Andean Volcanic Belt (AB ev)