21+ When Was Mount Tambora Last Eruption Images. It has been estimated that mount tambora stood approximately 12,000 feet tall before the 1815 eruption when the top third of the mountain was completely obliterated. Apart from killing tens of thousands of people and plunging south.
Tambora last erupted in 1815 a.d.
Smaller eruptions have occurred since, and in 2011, the alert level was raised to 3 (out of four) due to ongoing shallow volcanic tremor. < even though the last eruption was 43 years ago, it is still technically considered active. Eruption of the volcano at mount tambora in 1815 was the largest volcanic eruption of the 19th century. The 1815 eruption of mount tambora was the most powerful in human recorded history, with a volcanic explosivity index (vei) of 7.