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Image Collection | Hazards and Processes | Pyroclastic Flows

There are 5,901 volcano images available on the GVP website, including 4,165 in these new galleries with updated captions and keywords, and at a larger size.



Pyroclastic flows (also called pyroclastic density currents) are hot ground-hugging mixtures of volcanic rock, volcanic ash (pulverized rock, glass, and crystals), and gas that can race away from vents at great speeds. They can form from column collapse (the partial collapse of an ash plume), dome collapse (called block-and-ash flows), the collapse of lava flow fronts, ‘boiling over’ from the vent, or phreatomagmatic eruptions. They range in concentrations of gas and solid material, which can alter their behavior and the areas impacted.

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Image Gallery for Pyroclastic Flows

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