I just experienced my first earthquake: Chino Hills Earthquake. It lasted maybe 20-30 seconds and they’re saying it was a 5.4. It was sort of a rolling motion, as if Mahalo HQ was suddenly on water. It reminded me of being in a boat that hits something. Crazy. There’s definitely a sort of primal “whoa the ground isn’t supposed to do this” feeling when it happens.
More information on earthquakes in general can be found here.