%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Roche, Olivier
%A Buesch, D. C.
%A Valentine, G. A.
%T Slow-moving and far-travelled dense pyroclastic flows during the Peach Spring super-eruption
%D 2016
%L fdi:010066664
%G ENG
%J Nature Communications
%@ 2041-1723
%K ETATS UNIS
%M ISI:000371719500001
%P art. 10890 [8 ]
%R 10.1038/ncomms10890
%U https://www.documentation.ird.fr/hor/fdi:010066664
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers16-04/010066664.pdf
%V 7
%W Horizon (IRD)
%X Explosive volcanic super-eruptions of several hundred cubic kilometres or more generate long run-out pyroclastic density currents the dynamics of which are poorly understood and controversial. Deposits of one such event in the southwestern USA, the 18.8 Ma Peach Spring Tuff, were formed by pyroclastic flows that travelled >170 km from the eruptive centre and entrained blocks up to similar to 70-90 cm diameter from the substrates along the flow paths. Here we combine these data with new experimental results to show that the flow's base had high-particle concentration and relatively modest speeds of similar to 5-20ms(-1), fed by an eruption discharging magma at rates up to similar to 10(7)-10(8)m(3)s(-1) for a minimum of 2.5-10 h. We conclude that sustained high-eruption discharge and long-lived high-pore pressure in dense granular dispersion can be more important than large initial velocity and turbulent transport with dilute suspension in promoting long pyroclastic flow distance.
%$ 066 ; 064