Watch: Sinabung Volcano Pyroclastic Flow

Sinabung volcano in Indonesia continues to erupt, sending pyroclastic flows down it’s flanks.

Pyroclastic flows are essentially avalanches of lava, rock, ash and gases. They are triggered by massive explosions, or, as in the case of Sinabung, a partial collapse of the dome.

Once started, they can travel for miles, and a good sized debris field is building at the base of the mountain. There is a risk of larger flows, the temperature of which can reach more than 1,830°F (1000°C). Pyroclastic flows incinerate everything that lies in their path, and it was this phenomenon that caused the bulk of the deaths at Pompeii and Herculaneum when Vesuvius erupted in 79AD.

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