earth-shattering kabooms!

Brian Romans, from Clastic Detritus, pointed out on twitter that in recent Icelandic volcano footage, one can see amazing shock waves propagating through the ash cloud after explosions.

Wow! The air vibrates beautifully. Have a look. It happens several times in this video.



Wikipedia says, incidentally, that

The name Eyjafjallajökull is made up of the words eyja (genitive plural of ey, meaning eyot or island), fjalla (genitive plural of fjall, whose nominative plural is fjöll, meaning fells or mountains) and jökull (meaning glacier, cognate with the -icle in icicle). A literal translation would thus be the "island-fells glacier" or the "island-mountains glacier". The name Eyjafjöll describes the southern side of the volcanic massif together with the small mountains which form the foot of the volcano. The village and museum of Skógar are also part of the region undir Eyjafjöllum (meaning "under the Eyjafjalls").

So it's Eyjafjöll that's erupting? It's complicated.