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The volcanoes in Indonesia are among the most active of the Pacific Ring of Fire. They are formed due to subduction zones of three main active tectonic plates namely the Eurasian Plate, Pacific Plate, and the Indo-Australian Plate.
Subduction zones are locations where crustal plates are being forced down into the mantle below other crustal plates. These movements are not uniform, but instead occur in dis â¦ crete events. This is because friction causes the plates to lock in position until the stress exceeds the shear strength of the fault zone.hese zones also exist where one oceanic crust is pushed under another oceanic crust, the same volcanism results, but as it takes place at sea the result is the formation of underwater volcanoes. 45 people found this useful.