Likely they did, but probably no more than would have happened anywhere in high-winds.

I know here in the Greater Toronto Area can get hit by blackouts frequently because of tree falls. Having moved here from the UK I don't get the idiotic notion of letting trees grow through your power lines because inevitably a branch or the whole tree will fall and knock out power. I've seen a few trees that are so big that no matter what way they fall, they'll knock out power to both sides of the street.

It's surely caused by the earthquake, but it's hard to tell if it would only be cause by the earthquake. You've got to draw a line between "act of god" and an "act of man" for being stupid enough to let an earthquake, windstorm or snowstorm knock your power out.