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Transport and deposition in the May 18, 1980, Mount St. Helens blast flow

¹ Department of Geology, SUNY at Buffalo, Buffalo, New York 14260
² School of Mathematics, University of Bristol, Bristol BS8 1TW United Kingdom

A new, statistical sampling strategy for pyroclastic deposits has yielded data that reveal the depositional characteristics of the May 18, 1980, blast flow of Mount St. Helens. Samples were collected from each layer along a profile parallel to flow lines, as interpreted from tree blow-down directions. The decrease in the mass of sediment of different grain sizes with distance supports a turbulent-gravitational mechanism of suspended sedimentation, and transport within a dilute blast cloud having a density only slightly greater than that of the atmosphere. Traditional sampling strategies would have been unable to yield data suitable to test this settling mechanism hypothesis.

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				References Geological Society, London, Memoirs, January 1, 2003; 27(1): 127 - 136. [PDF]

				T. H. Druitt, E. S. Calder, P. D. Cole, R. P. Hoblitt, S. C. Loughlin, G. E. Norton, L. J. Ritchie, R. S. J. Sparks, and B. Voight Small-volume, highly mobile pyroclastic flows formed by rapid sedimentation from pyroclastic surges at Soufriere Hills Volcano, Montserrat: an important volcanic hazard Geological Society, London, Memoirs, January 1, 2002; 21(1): 263 - 279. [Abstract] [PDF]