Then I remembered that pyroclastic flows can reach speeds of 100mph.

These hot gases are known as a pyroclastic flow.

In a volcanic eruption, the same thing happens with a pyroclastic flow.

There are several factors which can produce a pyroclastic flow:

However, it is generally less pronounced in the area of pyroclastic flows and deposits.

An estimated 16,000 people died due to hydrothermal pyroclastic flows.

The most devastating effect of volcanic ash comes from pyroclastic flows.

A second eruption on May 16 led to pyroclastic flows that killed another 200 inhabitants.

These pyroclastic flows can knock down stone walls 10 feet thick and have killed thousands of people in less than two minutes, he said.

There was a further significant eruption on 4 December 2010, with large explosions and pyroclastic flows.

The pyroclastic flow rapidly incorporated and melted snow in its path.

This cloud will then collapse, creating a pyroclastic flow of hot volcanic matter.

Pyroclastic flows can travel hundreds of kilometres an hour.

This volcano is well known for its ash explosions and pyroclastic flows.

It is believed that Pompeii was destroyed by a pyroclastic flow.

The volcanic cone was formed by lava and pyroclastic flows.

The complex is made up of pyroclastic flow tuffs.

Within 10 minutes after the explosions, a pyroclastic flow swept over the eastern part of the volcano.

The initial phases of eruption are characterized by pyroclastic flows.

Pyroclastic flows are also common features of this type of eruption.

It covers almost all of southern Kyūshū, which was formed by pyroclastic flows.

Pyroclastic flows would destroy much wildlife about the volcano.

Even if the pyroclastic flow is minimal, Landing will soon be covered with ash at the rate it's now falling.

The initial eruption was an extremely violent, high-energy pyroclastic flow.

Today these volcanic products are seen as pyroclastic flow uplands and low relief hills.