Lahars
John Day Fossil National Monument.
A volcanic mudflow is called a “lahar”. Usually, a term depicting a violent type of debris flow or mudflow consisting of a pyro-clastic slur rocky debris, and water flowing from a volcano usually in a river valley. They are very destructive capable of flowing tens of meters per second and as deep as 140 meters destroying everything in their path.
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John Day Fossil National Monument.
