Talk:Pyroclastic surge

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Model

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)[reply]

Branney et al

Seminal work on the subject? Removed nomenclature? Pyroclastic density currents!!! —Preceding unsigned comment added by Russjass (talk • contribs) 14:24, 12 May 2008 (UTC)[reply]

Deadly?

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)[reply]

Speed

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)[reply]