[Wonder Warthog]

"Of course! Haven't you heard of the "oilcano"? Stay tuned as the intellectually (not to mention scientifically) challenged seek even greater superlatives of disaster! (and pass the popcorn)..."

You're joking of course, but google up "asphalt volcano". You're in for a surprise!!!

[emax]

And I had heard how release of mass amounts of methane creates dead zones, and how the hydrogen sulfides contained within could lead to explosions and extinctions if it is released near a fault line, or something like that. Looking at asphalt volcanoes found, it looks like nature is either a complete idiot or slitting its wrists, figuratively spaking.

[Smokin' Joe]

Try ‘mud volcano’, too.