[Raycpa]

An analysis showed that the CO2 was also from the mantle, confirming leakage from deep inside the Earth.

[gleeaikin]

Here is another interesting article about a CA fault which may reach to the mantle. I wonder if these places are nearby or the phenomena related? Are these signs of special danger?

http://la.curbed.com/archives/2015/06/newport_inglewood_fault_deep.php