That's exactly what this app from UC Berkeley does https://play.google.com/store/apps/details?id=edu.berkeley.bsl.myshake https://play.google.com/store/apps/de

That's exactly what this app from UC Berkeley does https://play.google.com/store/apps/details?id=edu.berkeley.bsl.myshake https://play.google.com/store/apps/details?id=edu.berkeley.b...