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The tectonics processes in Indonesia formed major structures in Indonesia. The most prominent fault in the west of Indonesia is the Semangko Fault or the Great Sumatran Fault, a dextral strike-slip fault along Sumatra Island (about 1,900 km). The formation of this fault zone is related to the subduction zone in the west of Sumatra.
The tectonic relationship of the Sangihe plate, Halmahera plate, and the Molucca Sea plate, plus the volcanic Halmahera Arc and the Sangihe Arc is complex. Their interrelationship constitutes the Molucca Sea Collision Zone. The north of this zone interlinks with the Philippine Mobile Belt.
The Flores back-arc thrust fault is a major system of west–east trending thrust faults that extend eastwards from west of Lombok just south of where Sunda Shelf ends at Bali Sea, towards the islands of Sumbawa, Flores, and Alor, with a total length of at least 800 km., [1] entering the Weber Basin and Aru Basin adjacent Sahul Shelf of the Australian plate.
Banda Arc tectonic map. The Banda Arc (main arc, Inner, and Outer) is a dual chain of islands in eastern Indonesia that is around 2,300 km long. It is the result of the collision of a continent and an intra-oceanic island arc.
The tectonic setting of the Molucca Sea region is unique. It is the only global example of an active arc-arc collision consuming an oceanic basin via subduction in two directions. The Molucca Sea plate has been subsumed by tectonic microplates, the Halmahera plate and the Sangihe plate .
Indonesia is a country located close to tectonic plate boundaries which causes it to have many active faults and is prone to earthquakes, [1]
The Great Sumatran fault, also known as Semangko fault, is a large strike-slip fault running the entire length of the island of Sumatra.This Indonesian island is located in a highly seismic area of the world, including a subduction zone off the west coast of the island.
Mount Tambora, or Tomboro, is an active stratovolcano in West Nusa Tenggara, Indonesia. Located on Sumbawa in the Lesser Sunda Islands , it was formed by the active subduction zones beneath it. Before 1815 , its elevation reached more than 4,300 metres (14,100 feet) high, making it one of the tallest peaks in the Indonesian archipelago.