If so they’ve been doing it non stop since August and at volumes loud enough to create 106dB pressure waves in my walls 
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We’re back on this goofy stuff again. At least we have a reference reading.
Offline is the reference measurement without a geophone attached (basically circuit noise).
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I’m sorry you’re having to go through this.
I’m also really interested in this … it’s like an old-fashioned Hardy Boys … "The Mystery of the Vibrating House".
Thank you for sharing the journey, and I hope sharing it is helping your sanity.
- Henry
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