Came on to add to this report, in a hurry right now but the link says it could be a shift in tectonic plates.
______beforeitsnews/alternative/2013/03/large-release-of-methane-off-los-angeles-coast-unusual-concentrations-detected-by-haz-mat-crews-gas-may-b
e-from-shift-in-tectonic-plates-2583606.html
edit on 5-3-2013 by antar because: Link correction