A true story.
A few years ago, we were camping in Alaska. We took the Marine Highway to Haines and were going to stay at Chilkat State Park, an amazingly beautiful location at Chilkat Lake. As we checked in, in late May, the park host gave us a warning that there had been a LOT of very active bears working the park and to be very cautious. After getting settled, DW and I were sitting down to a nice lunch when the trailer started a series of shakes. I immediately thought of the cooler in the basement full of steaks, sausage, and various other goodies a bear might love. It was right beside the BBQ that I had been cooking on for the past week and might not have been as clean as it could have been. I grabbed a frying pan and large pot and exited the rig banging them together while shouting HEY BEAR, HEY BEAR, very loudly. Did that dance all the way around the rig and saw nothing, but we were in deep woods and a bear could have easily slipped away.
Fast forward to the next day. When we were going out on a salmon charter the captain asked if we had any damage from "yesterday's earthquake". DW and I shared sheepish looks but didn't elaborate beyond a "no...nothing".
One good point though. Because we were early in the season, the campground was sparsely populated and no one saw me making a fool of myself running around the rig banging pots. LOL.
We've since experienced a number of shakes in the 9 Alaska trips we've been on. Sort of a ho-hum thing now.