Quoted from DavidCPA:I can confirm that mine has been through a couple of real quakes. The last "big one" was right before Christmas up in Northern California. Not too bad in my area but still woke me up.
I can also confirm my ES survived the 1989 Loma Prieta quake and other small ones after. Friend and I were actually playing ES at a pizzeria/bar in '89 when it the quake hit. Always found it amazing that Williams implemented the first shaker in a pinball machine that year!