Convergent Boundaries (Subduction)
   |   | Learning Objective
<< Back
2. Oceanic-Oceanic Convergence

When two oceanic plate convergence, one will descend beneath the other. This will trigger volcanic activity similar to that which occurs at an oceanic-continental convergence. The difference here is that the volcanoes form on the ocean floor. If the activity continues the volcanoes will emerge as islands in the ocean. This newly formed land consists of an arc-shaped chain of small volcanic islands is called a volcanic island arc. The Tonga, Aleutian and Mariana islands are examples of volcanic island arcs. These island arcs are usually located about 200 to 300 km from a trench axis