My wife and i were in Hawaii, staying at Waikiki in 2010 ish? not long after the major tsunami hit Malaysia area. There was a tsunami warning and they closed down the streets, sirens and everything, the whole works, everyone had to remain inside the buildings and be above the ground floor level. They knew exactly when it was to hit the shoreline and we were lucky enough to have an ocean view. It was exciting and scary at the same time and then at the appointed time the wave was about 300mm higher than normal. Thankfully that's my only experience of quakes and not what others have suffered.