How was Indonesia islands formed?
The Indonesian archipel- ago formed over the past 300 million years by reassembly of fragments rifted from the Gondwana supercontinent that arrived at the Eurasian subduction margin. The present-day geology of Indonesia is broadly the result of Cenozoic subduction and collision at this margin.
What is an example of a convergent boundary?
The Pacific Ring of Fire is an example of a convergent plate boundary. At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents.
Why is Indonesia so volcanically active?
Indonesia is the country that contains the most active volcanoes of all countries in the world. The Eurasian Plate, Pacific Plate and Indo-Australian Plate are three active tectonic plates that cause the subduction zones that form these volcanoes.
What is Indonesia known for?
Nowadays, Indonesia is famous for its diverse and multicultural islands, from deeply religious Aceh in the north; to the country’s center of government in Java; to the tropical paradise of Bali; and all the way down to the province of Papua on the border with independent Papua New Guinea.
Is Indonesia a volcanic island arc?
The Indonesian region includes several volcanic island arcs that are highly active at the present day, and also contains a record of Cenozoic volcanic activity owing to subduction of oceanic lithosphere at the margins of SE Asia.
What plates caused the Indonesian earthquake 2018?
The January 15 event was a shallow crustal earthquake at the boundary between the Sunda plate and the Banda Sea microplate at a focal depth of 18 km. The earthquake occurred along the Mamuju–Majene thrust fault, which is known to be an active seismic source that has caused several deadly earthquakes in the recent past.
How often do earthquakes occur in Indonesia?
In 2004 a very large earthquake in Sumatra, Indonesia measuring around magnitude 9.3, caused a tsunami that caused vast amounts of damage. Large earthquakes over a magnitude 8 are called “great earthquakes”. Great earthquakes happen on average once every 1.5 years.
What landforms are created by convergent boundaries?
Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.