Where it is and what it carries
The Panama Plate covers about 274,000 square kilometers, or 0.05% of Earth’s surface. It holds 94.5% of Panama and 75% of Costa Rica, including San Jose, the Nicoya Peninsula and the Panama Canal. It also extends offshore into the Pacific and the Caribbean.
Its crust is mixed. The isthmus is built mainly from volcanic arc rock that grew on top of oceanic crust and thickened over time. Geologists often call it the Panama Block or Panama Microplate, and its boundaries with the Caribbean and North Andes plates are broad fault zones.
What happens at its edges
The northern edge faces the Caribbean Plate along a 1,277 km boundary that moves at about 1.1 cm/yr. Offshore, this boundary is the North Panama Deformed Belt, a zone of thrust faults where Caribbean seafloor is pushed beneath the isthmus.
The southwestern edge is the southern end of the Middle America Trench. Here the Cocos Plate subducts beneath Costa Rica and western Panama at about 7.5 cm/yr. The Cocos Ridge, a thick volcanic ridge on the Cocos Plate, collides with southern Costa Rica and helps raise the Talamanca Range.
To the south, the Panama Fracture Zone forms a transform boundary with the Nazca Plate at about 4 cm/yr. In the east, the plate meets the North Andes Plate near the border with Colombia, at about 1.3 cm/yr. This collision is slowly pushing the isthmus into northwestern South America.
Earthquakes and volcanoes
The dataset lists 44 earthquakes of magnitude 6.5 or larger on the plate since 1900. The largest was an M7.7 earthquake in Panama in 2026. Costa Rica had the 1991 Limon earthquake (M7.6) on the Caribbean side and the 2012 Nicoya earthquake (M7.6) on the Pacific side, along with an M7.59 event in 1939 near Atenas. Western Panama had an M7.5 earthquake in 1934 near Burica.
The plate holds seven volcanoes in the dataset, nearly all in Costa Rica. Poas and Turrialba, near San Jose, have erupted in recent years. Arenal was continuously active for decades until about 2010, and Irazu last erupted in 1977. In Panama, Volcan Baru (3,474 m) is the country’s highest peak. East of Baru, Cocos subduction gives way to the Panama Fracture Zone, and the active volcanic arc ends.