Trench Islandic Arc Older Oceanic Crust (Denser) Subducting Younger Oceanic Crust Earthquake Zone Asthenosphere Lithosphere Melting Plate rises up through the crust

Trench

The Mariana Trench was formed by the Pacific Plate subducting beneath the Philippine Sea Plate.

Islandic Arc

Sunda Islands, island arc is created by subduction of the Indo-Australian Plate beneath the Sunda Plate (part of the Eurasian Plate)

Younger Oceanic Crust

Earthquake Zone

Earthquakes occurring at oceanic-oceanic collision zones, also known as subduction zones, are considered the most dangerous due to their potential for generating massive megathrust earthquakes, which can trigger devastating tsunamis