The Geology of Indonesia/Plate Tectonic

Indonesia is a meeting place of two tectonic plates, Australia and Asia. The Australian plate was moved northward and subducted under the Eurasian plate. The subduction zone can be traced from northern tip of Sumatra until the Lesser Islands, that creates deep submarine trench. Most of the earthquake also concentrate in this subduction zone. This subduction also trigger the formation of volcanic range from Sumatra, Java to Lesser Islands.

The Eastern Indonesia also experienced another subduction of Pacific plate that move southwesterly under the Eurasian plate. This subduction create the formation of volcanoes in the North Sulawesi, Sangihe and Halmahera.