This one is closer to "reality". When you look at images of pyroclastic 
flows you see that the ash+gas is /billowing/* outwards and downwards. 
You do not /see/ the explosion, you only see the expanding cloud and its 
travelling down the mountain side. Ascending from the crater is the 
lighter gas+ash that is not trapped in the flow proper.

However, your image conveys the /idea/ of an explosion behind the flow 
and that is the interesting interpretation imo.

Thomas

* Billowing means here that the cloud shows rounded forms generated by 
the expanding force of the super-heated gas.

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