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Those frequency graphs don't look all that single frequency like, to this ignorant layman.

The graphs show not frequency but amplitude (the size of the jiggle). I presume the black peaks before 9:36 and after 9:46 are background noise. The busy stuff in the middle is presumably the signal of interest. If I measure between the peaks of that signal, I find that they are roughly 17 seconds apart (+-2 seconds given the resolution), consistent with what others are saying.

[Not a geologist, but the university I graduated from calls me an electrical engineer.]

572 posted on 12/02/2018 6:11:22 PM PST by AZLiberty (218 House seats or bust! Bust. But the Dems will be busted for election fraud.)

THANKS. Much appreciated. What is your perspective on the claims of ‘Tesla rays’ being used in the California forest fires?

580 posted on 12/02/2018 6:16:02 PM PST by JockoManning (http://www.zazzle.com/brain_truth for hats T's e.g. STAY CALM & DO THE NEXT LOVING THING)