A pyroclastic flow (also known scientifically as a pyroclastic density current) is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph). The gas can reach temperatures of about 1,000 °C (1,830 °F). Pyroclastic flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the volcanic output rate, and the gradient of the slope. They are a common and devastating result of certain explosive volcanic eruptions.
Originally posted by Murgatroid
43 people died during this incident in June 3, 1991
Two of those killed were volcanologists Katia and Maurice Krafft who where filming eruptions at Mount Unzen.
Below is a quote from them, filmed the day before their deaths:
"I am never afraid because I have seen so much eruptions in 23 years that even if I die tomorrow, I don't care," Maurice Krafft
Originally posted by l0vedim0
....That guy out ran the mini van.....
Running got that person to the other side of the river. Nobody in their right mind is just going to stand there watching it come at them.
Originally posted by FraternitasSaturni
... against a pyroclastic flow why bother running? Either it gets to you, or not - its up to it, not up to you really... speeds up to 600 or 800 km/h (almost 500mph) and temperatures as high as 1000ºc (1800f) its not like running will get you anywhere...
Originally posted by theboarman
i wonder how many people died?