The dome of Unzen, Japan Volcano collapsed and created a pyroclastic flow in '91. The people here escaped when the flow stopped before reaching them, but the deadly and terrible speed of it, is astonishing.  Pyroclastic flows are fluidized masses of rock fragments and gases that move rapidly in response to gravity. They  can form in several different ways, such as when an eruption column collapses, as the result of gravitational collapse or from an explosion on a lava dome.

The dome of Unzen, Japan Volcano collapsed and created a pyroclastic flow in '91. The people here escaped when the flow stopped before reaching them, but the deadly and terrible speed of it, is astonishing. Pyroclastic flows are fluidized masses of rock fragments and gases that move rapidly in response to gravity. They can form in several different ways, such as when an eruption column collapses, as the result of gravitational collapse or from an explosion on a lava dome.

Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines, during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano.  Credit: Photograph by C. Newhall on 15 September 1984.

Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines, during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano. Credit: Photograph by C. Newhall on 15 September 1984.

Pyroclastic flow will destroy nearly everything in its path. With rock fragments ranging in size from ash to boulders traveling across the ground at speeds greater than 80 km per hour, pyroclastic flows knock down, shatter, bury or carry away nearly all objects and structures in their way. The extreme temperatures of rocks and gas inside pyroclastic flows, between 200°C and 700°C, can cause combustible material to burn, especially petroleum products, wood, vegetation, and houses. -- Samuel…

Pyroclastic flow will destroy nearly everything in its path. With rock fragments ranging in size from ash to boulders traveling across the ground at speeds greater than 80 km per hour, pyroclastic flows knock down, shatter, bury or carry away nearly all objects and structures in their way. The extreme temperatures of rocks and gas inside pyroclastic flows, between 200°C and 700°C, can cause combustible material to burn, especially petroleum products, wood, vegetation, and houses. -- Samuel…

Pyroclastic flow during August 7, 1980 Mount St. Helens eruption. The view is from Johnston Ridge, located 8 km (5 mi) north of Mount  St. Helens.

Pyroclastic flow during August 7, 1980 Mount St. Helens eruption. The view is from Johnston Ridge, located 8 km (5 mi) north of Mount St. Helens.

Santiaguito volcano (Guatemala): partial dome collapse generates strong explosion and pyroclastic flows

Santiaguito volcano (Guatemala): partial dome collapse generates strong explosion and pyroclastic flows

A major eruption occurred yesterday evening. Starting at (local time), the top part of the Caliente lava dome collapsed and produced a series of relatively large pyroclastic flows and explosions. Ash plumes rose more than 2 km to elevations...

Volcanic ash is made of tiny fragments of jagged rock, minerals, and volcanic glass. Ash is a product of explosive volcanic eruptions.

Volcanic ash is made of tiny fragments of jagged rock, minerals, and volcanic glass. Ash is a product of explosive volcanic eruptions.

Terrifying Pyroclastic Flows Sinabung Volcano Eruption in 4K Ultra HD  Published on Jan 24, 2014 Terrifying Pyroclastic Flows Sinabung Volcano Eruption in 4K Ultra HD. For licensing please email James (at) EarthUncut (dot) TV Shot at Sinabung volcano, Indonesia on 21st January 2014. No unauthorised ripping or commercial use. 火砕流

Terrifying Pyroclastic Flows Sinabung Volcano Eruption in 4K Ultra HD Published on Jan 24, 2014 Terrifying Pyroclastic Flows Sinabung Volcano Eruption in 4K Ultra HD. For licensing please email James (at) EarthUncut (dot) TV Shot at Sinabung volcano, Indonesia on 21st January 2014. No unauthorised ripping or commercial use. 火砕流

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