[COB1]

"The odds of this being the culprit behind Tunguska are very remote."

I agree, dog.
If we were talking about methane collecting in a valley from a shallow gas bearing sand, then suddenly exploding due to static electricity, I could buy that.
But I can't buy gas collecting in an area the size of Rhode Island!

The second possibilty is equally remote:
A deep high pressure sand is somehow suddenly relieved of it's overburden pressure and blows out.
The blowing out of the amount of gas necessary for that kind of explosion in that short of a time period is an unrealistic scenario.

[razorback-bert]

Hey, with further thought this works for me, I just remembered that Project Blue Book use to blame UFOs on swamp gas.


I am dealing with a "know it all geologist" right now ,will ask him.