Plenty of survivors - only one death that I know of, and that was a heart attack. Fortunately it wasn't a Sunday. My brother-in-laws cousins go to one of the churches which lost a roof, so it is known about. Mercalli is to earthquakes what Beaufort is to wind, a set of observational based levels which help to classify quakes in terms of damage, ranging from I, just detectable by experienced observers when prone, through to XII, damage total, vibrations distort vision, objects thrown in air, major catastrophe. VI is felt by all, heavy objects moved, alarm, strong; VII is general alarm, weak buildings coonsiderably damaged, very strong. I think Colchester was verging on VII. When I was taken around the area on my first week in college, we had all the strengthening stays and distorted doors in cottages pointed out to us, but I somehow missed the word earthquake. I'm sure it wasn't mentioned. It would have made a boring day much more interesting.