Abstract

Four main types of pyroclastic flows are characteristic of Lesser Antillean volcanoes. These are pumice flows, scoria flows, semi-vesicular andesite flows and block and ash flows (nuees ardentes). Associated with these are ground surges produced directly either from the crater or from an eruptive column and ash-cloud surges derived from the turbulent upper part of pyroclastic flows. Ash-cloud surges may become detached and move independently of their parent flow and can resegregate to form secondary pyroclastic flows and surges. Field, granulometric and textural characteristics of the deposits from the different types of flows and surges are presented together with a discussion on their modes of origin and potential hazards.

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