An M2.3, but maybe the Canadians say it's a 4! :) Anyway, this interlude is brought to you by my fascination with the Cornwall earthquake of 1944.
I've investigated this earthquake by reading the old books, interviewing survivors, and walking around. It is a perfect example on how low the PGV can be on rock, and how swamp amplifies the PGV by over a factor of 10. PGA is never amplified, and that's why our building codes are so dangerous. Since nobody learned from the Chile quake, we await our lessons. :(