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The 'Bama Boom ('Bama is short for the US state of Alabama) is a term for some audible "booms" heard by many people in Alabama and now in Colorado. See for example the Popular Mechanics article Mysterious, Powerful "Boom" Shakes Alabama and the Tech Times' Mysterious Booms Heard In Colorado Leave Residents Baffled.

In this question I'm just asking about the measurements shown below from the CBS Denver News item Mysterious Booms Around World Now Heard In Colorado, not about the "booms" themselves.

The second plot states it's a seismogram, but I can't tell what the first one likely represents. Could this be an infrasound measurement? The caption says that it's a "sound graph" but that's not necessarily a technical term.

enter image description here

above: "A sound graph from the USGS Lakeview Retreat near Centreville, Ala., shows a loud boom heard over Alabama at about 1:39 p.m. CST on Nov. 14. The cause of the boom is still unknown. (credit: NASA)" From here.

enter image description here

above: "(credit: USGS and CBS)" From here.

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    $\begingroup$ the first graph being infrasound seems to be a valid assumption. The sampling rate given in the header is 40 sps (40 Hz), which means the Nyquist frequency (the maximum frequency that can be properly recovered) is 20 Hz, which is the upper end of the infrasound range $\endgroup$ – ye-ti-800 Nov 25 '17 at 17:43
  • $\begingroup$ @ye-ti-800 I'm guessing that the high-frequency cut-off for seismic data might also be around there as well, so I don't really assume either way. $\endgroup$ – uhoh Nov 26 '17 at 4:38
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    $\begingroup$ yea that's right of course. Seems like there is a seismometer station called US.LRAL in Alabama. Has the right frequency range, too... anf.ucsd.edu/stations/US/LRAL $\endgroup$ – ye-ti-800 Nov 26 '17 at 13:29
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    $\begingroup$ right, but for this particular station the website only lists a seismic sensor. Since for other stations other sensors are listed as well, that might be a clue? $\endgroup$ – ye-ti-800 Nov 26 '17 at 15:27
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    $\begingroup$ also: for the infrasound measurements they seem to have different channel codes. BHZ only occurs with the seismic stations. Might be specific nomenclature for seismic data acquisition scedc.caltech.edu/station/seed.html $\endgroup$ – ye-ti-800 Nov 26 '17 at 15:31

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