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Originally posted by BobAthome
Check for Pwave and Swave readings please,, it's a frequency sine wave,,,look for corresponding increase in said area,, or plate shift harmonics.
Originally posted by Hendrix92TheUniverse
Do you live near water? Could you be hearing the mating call of aligators which is loud low frequency sound?
When the shuttle launches, aligators make this sound in response, trying to outdo a rival.
Just a thought.