It is no understatement to say that George P.L. Walker, who died in 2005 at the age of 78, was the father of modern quantitative volcanology. His pioneering work in recording in extraordinary detail the deposits of volcanic eruptions, and his careful documentation of the morphological and other features of lava flows and dykes, transformed the field of physical volcanology. In particular, his exhaustively careful collection, synthesis and exploitation of field data sparked the insights that led to the first proper understanding of the emplacement mechanisms of several key volcanic facies (pyroclastic flows and pahoehoe lava fields, to name but...

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