World's Only Moving Mud Puddle

I'm curious as to the acidity of the water. I know in our blood, we transport carbon dioxide not as carbon dioxide but carbonic acid or H2CO3. I'm wondering if the pH is low enough to aid in the digestion of the surrounding strata. If you were also smelling sulfur, I don't think it would be that much of a stretch to assume the might also be traces of sulfuric acid.

Has anyone done any coring of the area to gauge the structure of the strata at say 100 or even 1000 feet below the surface? Knowing the composition and how it reacts with a mild to strong acid, coupled with intense pressures (which could translate into heat generation) may be the driving forces behind the movement of this seemingly innocuous mud puddle.