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Model edit
We can model a pyroclastic surge by using the white steam from an ultrasonic humidifier. The water droplets and the air are fairly warm, yet the steam flows downward to form a ground-hugging density current. Air has a density of around 1.2 kg m3, but if the added mass due to suspended particles is significant, then even though the particles remain suspended, they drag down the air between them as they fall. --Wjbeaty 21:09, 6 August 2006 (UTC)
Branney et al edit
Seminal work on the subject? Removed nomenclature? Pyroclastic density currents!!! —Preceding unsigned comment added by Russjass (talk • contribs) 14:24, 12 May 2008 (UTC)
Deadly? edit
I know that Pyroclastic flows are always lethal. Are Pyroclastic surges? And were there Pyroclastic surges at the 1980 eruption of Mount St. Helens? (See Talk:1980 eruption of Mount St. Helens#Unnamed flow) --The High Fin Sperm Whale (talk) 02:05, 11 September 2009 (UTC)
Speed edit
I can only find one reference for the speed of a pyroclastic surge being up to 650 mph, which is an unsourced page on geology.com. fairly comprehensive paper on the highest speed components of pyroclastic density currents includes citations for a number of speed estimates with comments on the reliability of each. Catavar (talk) —Preceding undated comment added 05:09, 10 September 2012 (UTC)