Vibrant, captivating and utterly terrifying. These might be just a few ways to describe this time-lapse video of a volcanic eruption in southern Chile this week.

The Calbuco volcano unexpectedly erupted for the first time since 1972 — and has done so twice since Wednesday — shooting 10 km of ash straight up into the sky. According to NPR, 5,000 people have evacuated the area and ash clouds are affecting surrounding areas of Argentina.

There's no audio in the video, but to one resident of Puerto Montt, about 20 km from the volcano, the eruption sounded "as if somebody had detonated an atomic bomb."