I believe it was Yellowstone. If I remember correctly, The eruption was around 2500 times larger than the mount st. Helens eruption a few years ago. We are around 46,000 years over due for an eruption.
The eruption of Mount Mazama that formed Crater Lake was a caldera forming eruption. This is the most violent type of volcanic eruption.
Pelean
i
Pelean
Only the most violent volcanic eruptions feature a pyroclastic flow.
The most violent historical eruptions of Cotopaxi volcano were in 1744, 1768, and 1904, so to answer your question the most recent eruption was in 1904
Mt Fuji was pyroclastic flow in 1707-1708[ its last eruption ] their for it was a violent eruption.
The most violent type of volcanic eruption among those listed is the Plinian eruption. Plinian eruptions are characterized by high eruption columns, massive ash plumes, and volcanic explosivity index values of 4 or 5. These eruptions are named after Pliny the Younger, who described the eruption of Mount Vesuvius in 79 AD.
Both the Pelean and Plinian eruptions are violent, and the Plinian (such as Vesuvius) are the most spectacular type. More specifically, there is a designation "ultra-Plinian" to describe highly explosive eruptions such as Kratatoa. The type of eruption that is most violent is when lava, ash and other materials are hurled into the air.
Ithink it was very violent
It was very violent.
Pelean