Mount Tambora is still active and minor lava domes and flows have been extruded on the caldera floor during the 19th and 20th centuries. The last eruption was recorded in 1967. However, it was a gentle eruption with a VEI of 0, which means it was non-explosive. Another very small eruption was reported in 2011. In August 2011, the alert level for the volcano was raised from level I to level II after increased activity was reported in the caldera, including earthquakes and steam emissions.