[rockprof]

From the report, it isn't clear what the hell these are. I'm guessing they may be natural gas emissions. If they follow a creek bed it's likely that they're being emitted along a fault line. I have no idea what the regional geology is like there but it's highly unlikely to be volcanic in origin (no reason to run for the hills yet!).

[mewzilla]

How about chances it could be an earthquake precursor?

[berkeleybeej]

I'm guessing they may be natural gas emissions.

So help me understand a bit (cause your guess beats the reporting) - Would there be a big pocket of natural gas, a bit of shifting in the earth and the gas just following the shift?

[Smokin' Joe]

Apparently the oil and Gas industry is a big player in the local economy. There may be a well out there somewhere with a casing leak or a bad pipeline and the gas is following the creek sediments and blowing out when and where it can.

Someone there should check out the infrastructure, following these 'geysers' to either end of the line. My bet is there is a gas pipeline crossing the creek somewhere with a problem.