We ( my co-workers & myself ) felt this in San Francisco. A very strong, very suprising thump. For an M3.4, it was suprisingly strong. I've been in quite a few when I say that. Usually, from that distance, it feels much more mild. Of course each one is unique and the frequency might have played a role. A few co-workers were oblivious to it; however, many came running to me telling me they actually felt it! ( which is unusual, because usually only I feel them )