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