When I was there at the beginning of this month, there were a few 4's. I felt them but use to live in San Fran so it didn't really bother me. But the rides shut down, all the people were moved off the rides and out of the queues and the rides did not re-open until the cast did a full walk through of the ride. Some rides came back quick, other took about an hour to open again. Happened twice that day.
I was in line for Radiator Springs Racers when this happened. Apparently a CM came out and told the crowd there'd been an earthquake & the ride would be down briefly as they waited for it to be checked out. Didn't actually feel it, but overheard some other people in line saying it was an earthquake but they didn't feel it either. Ride was down for about 20 minutes. My mom felt the bed move in the hotel room, but didn't know what it was.