Physics problem: work out for me, if you will, the amount of energy available for this ‘reaction’ assuming the Methane was within the Flammability limits as posted earlier and the hole is say 15’ deep by 3’ diameter:
http://www.youtube.com/watch?v=_MtCg-8v9W
We will use your answer and extrapolate that to a house filled with the same Methane gas mixture ...
From practical experience from seeing the results, enough to level the house and have insulation falling out of the sky like snow a 1/2 mile away. See my previous post.