Tambora volcano in Indonesia has been raised to level 3 alert. Continuous tremor was recorded at the volcano. On 7th September there were 40 shallow volcanic earthquakes. Tourists and locals are advised to avoid the summit area of Tambora volcano.
Tambora lies 340 kilometres (210 mi) north of the Java Trench system and 180–190 kilometres (110–120 mi) above the upper surface of the active north-dipping subduction zone. Sumbawa island is flanked to both the north and south by the oceanic crust. The convergence rate is 7.8 cm/year (3 in/year). Tambora is estimated to have formed around 57,000 years ago. Depositing its strata has drained off a large magma chamber inside the mountain. The Mojo islet was formed as part of this geological process in which Saleh Bay, collapsing into the caldera of the drained magma chamber, first appeared as a sea basin, about 25,000 years ago.
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