can flow tens of metres per second, they have been known to be up to 140 m deep, and large flows tend to destroy any structures in their path. Notable lahars include those at Mount Pinatubo in the Philippines and Nevado del Ruiz in Colombia, the latter of which killed more than 20,000 people in the Armero tragedy.

Etymology

The word lahar is of Javanese origin. Berend George Escher

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