https://www.inverse.com/article/11455-myshake-turns-phones-into-seismic-wave-shazam-distributes-the-richter-scale
'MyShake' Turns Phones Into Seismic Wave Shazam, Distributes the Richter Scale
Feb 14, 2016 - The other phone vibrations.
richter scalemyshaketurnsphonesseismic