Why is this room moving?

In the middle of the seminar this morning, while Mary was down the hall, our giant seminar room started gently swaying from time to time. It lasted only a few seconds, but I quickly realized that I had just experienced my first earthquake. We learned later in the day that it registered about 7.0, and was centered about 180 miles north in Colombia.

I'll have some better observations tonight, but now Mary and I are off for a tour of Quito, with walking, riding and a folk ballet in store.

Obviously Mary is better, but still has a cough.

We met some interesting folks today, but still haven't ventured outside the hotel.