vertigo?

Last night there was a farewell potluck dinner for one of the couple missionaries. They are leaving the mission in two weeks. As we were just finishing up and most of the people had left, I suddenly felt a little dizzy. It didnt go away, but got worse, so I sat down. That made the chair feel like it was bouncing and I was still dizzy. The others also sat down with surprised looks ontheir faces. We all looked out the window. We saw trees waving, the construction crane a block away was bouncing up and down. The pictures on the wall were swinging widely. But the Angel Moroni atop the temple did not move an inch. We were sitting out an earthquake! They dont get worried unless things get broken around here, so nothing happened. After what seemed like 10 minutes, but was probably only 30 seconds, the tremors stopped. This morning as we were going down the stairs (because the elevator was broken again), I noticed a horizontal crack about 10 feet long and 2 inches wide above the windows in the stairwell. Today in the paper we read that the temblor was 7.0.