According to the same story from AP that has been ruled out.
“There are some stories going around that’s what it was, but based on the research we’ve done here, it doesn’t appear what people heard is related to the cryoseism phenomena,” Day told The Norman Transcript. “There’s not enough moisture, and the temperatures are not cold enough. That happens in areas where you have a lot of water flowing through a lot of rock,” Day said.”
“...that has been ruled out...”
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Possibly a correct “ruling”, but I always rule out complete acceptance of the veracity of government employees -— particularly government employees who also try to advance the canard of “global warming”.