The violent eruption which killed 1,700 people has never been satisfactorily explained.

More violent eruptions are possible only in unique circumstances, such as an eruption into a lake.

"Clearly, we want to make sure they're taking their medication so there are no violent eruptions in the prison."

All four were swept away in a sudden violent eruption.

Locals evacuated while the violent eruptions continued for three days.

Unfortunately, these measures were too late, and in a violent eruption the nuclear waste exploded.

It represents the most violent eruption in the world in the last 5,000 years.

Suddenly, there was a greater disturbance, a more violent eruption.

But violent eruptions are rare; the most recent of note was in 1996 when four people were hurt.

These rhyolites can be quite hot and form violent eruptions, despite their low water content.