When I lived in Alaska, quakes like that were a common occurence and nobody flinched. I saw people working away at their stations without a concern in the world except to reach over and move their coffee cup before it slid over the edge while going through files or clacking away at keyboards. Many bars even had an "earthquake bell" - if it rang by itself during a quake, the next round of drinks was on the house. Earthquakes were very popular up there if you were in the right place.
Gerard