Abstract
Criteria are presented on how to discriminate a debris avalanche deposit from other volcaniclastic formations. A debris avalanche deposit is morphologically characterized by hummocky topography and may be steep-sided cliffs at the distal and lateral edges. The source area of the debris avalanche is characterized by a horseshoe-shaped crater. Additional evidence to identify a deposit as a debris avalanche is the presence of block facies and matrix facies. Block facies consists of coherent, unconsolidated or poorly consolidated fragments of a volcanic body which commonly preserve their internal stratifications and/or intrusive contacts. Conjugate fractures develop within block facies that originates from massive and compact igneous bodies. A matrix facies is made of a mixture of various kinds of volcanic clasts derived from various parts of a source volcano. Patches of soil, stream gravels and pieces of wood may be picked up during transportation.
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