A kind of classical "Earth groaning" sounds recordered on March 19, 2012, in Pardubice, Czech Republic:
It isn't "trumpet" or "godzilla" sound, your opinion?
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It's a continuous, constant tone humming sound, very clear.
The author says:
The most interesting thing: This sound is a "Mi" note...
This one is a "Mi" (E) tone; and I'm sure...
This is something different from the various "earth groaning", "humming" and "trumpet" sounds. The author didn't specify the location where the video was recordered.
The sounds are like distant drums...