Where it is and what it carries
The Galapagos Plate is one of the smallest plates in the PB2002 model. It covers only about 14,600 square kilometers, a tiny fraction of Earth’s surface, in the eastern Pacific Ocean just north of the equator. It lies at the Galapagos Triple Junction, where the Pacific Plate, the Cocos Plate and the Nazca Plate meet.
The plate is made entirely of young oceanic crust, all of it under deep water. It carries no islands and no land belonging to any country.
What happens at its edges
All three of its boundaries are mainly spreading ridges, so new crust forms on every side.
The western edge, about 189 km long, is part of the East Pacific Rise. Here the microplate separates from the Pacific Plate at about 11.6 cm/yr on average, one of the fastest spreading rates on Earth.
The southern edge, about 281 km, faces the Nazca Plate. It is a mix of spreading ridge, short transform faults and a section of compression, with an average relative speed of about 3 cm/yr.
The northern edge, about 106 km, is a slow spreading ridge shared with the Cocos Plate, moving at only about 0.9 cm/yr. The Cocos-Nazca spreading system, also called the Galapagos Spreading Center, runs east from this area toward the Galapagos Islands.
Why geologists separate it
At this triple junction, the Cocos-Nazca rift does not meet the East Pacific Rise cleanly. Instead, its western tip has broken into older crust, and a small block between the ridges has been left to rotate on its own. Studies of seafloor magnetic stripes and seafloor mapping show that this block moves independently of all three surrounding plates.
The same process happens at other fast-spreading triple junctions. Two similar microplates sit farther south along the East Pacific Rise, the Easter Plate and the Juan Fernandez Plate.
Because the Galapagos Plate is so small and lies in such deep water, the details of its boundaries and motion are less certain than for larger plates. Some researchers describe it as part of a broader zone of deformation at the triple junction rather than a fully rigid plate.
Earthquakes and volcanoes
The dataset records no earthquakes of magnitude 6.5 or larger on the Galapagos Plate since 1900 and no named volcanoes. Spreading ridges typically produce many small, shallow earthquakes rather than large ones, and the volcanic activity here takes place quietly on the deep seafloor.