. . . it gets worse
Quake Watch chart has more detail:
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More than 27,000 abandoned oil and gas wells lurk in the hard rock beneath the Gulf of Mexico, an environmental minefield that has been ignored for decades. No one — not industry, not government — is checking to see if they are leaking, an Associated Press investigation shows.
Abandoned wells map around Bayou Corne
” . . . Scientists believe that the possible sources could come from from oil and gas related activities such as coal mining and fracking where natural gas can seep from the ground. . . “