This famous video by YT channel Abyssius shows Mount Tavurvur's spectacular explosion of August 29th, 2014. It also contains a bonus: the impressive visible and audible shockwave [source, full video: buff.ly/2pOqVB4]
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About 13 seconds between visual and the sound, about 0:02 and about 0:15.
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It’s amazing how you see the explosion way before you can actually hear the bang my friend. Light travels a lot faster than sound.
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Planned a photography excursion to there around that time, didn't work out. Maybe it was for the best...
I don't have great experience with active vulcanos anyways...