Well, I felt my first earthquake early this morning! 3.6 measured - about 3 miles from where we are staying (Oakland, CA)..... I was impressed. We were instantly awakened - it was not a rolling or swaying, but like a crack or a shot. We are in a one story, so didn't get the same back and forth that many would. It lasted well less than a second....felt like a truck hit the side of the house! Just BANG and that was it. Sharp sound. My daughter tells me each one is different. This was quick and violent. I am impressed that buildings out here can stand up to these...and, of course, much stronger ones!