Most earthquakes send out waves with a slew of different frequencies, but Mayotte’s signal was a clean zigzag dominated by one type of wave that took a steady 17 seconds to repeat.
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At the risk of breaking out of the Q Anon apartheid homeland, I would point out that this could be written as “a steady Q seconds” on a very significant date, November 11, 2018. ;-)
bandwidth relative to its center frequency perhaps?