Its last known eruption was in 1972
The Calbuco volcano in Chile erupted for the first time in more than four decades on Wednesday, prompting officials to issue a red alert for the city of Puerto Montt. Authorities evacuated around 1,500 residents within a six-mile radius of the volcano after it spewed ash into the air, according to the Associated Press. The volcano, located some 600 miles south of the capital, Santiago, last erupted in 1972.
This is the second eruption in Chile this spring. In early March, the Villarrica volcano expelled ash and lava. Chile has the second-largest chain of volcanos in the world, following Indonesia.