Twenty years ago, I was at work, walking down the hall to my office, when suddenly it felt like some giant was shaking the building back-and-forth. I was bouncing off the walls and getting hit on the head with ceiling tiles. After it stopped seconds later (but a half-hour sounds about right-;)), I went back to my office, and the phone rang. It was Erik, calling to find out if I was okay. He was certainly quick on the draw; I hadn't gotten past, "Hey, I'm alive" yet. He called back a little while later, told me about the Bay Bridge collapse, and we agreed that he should take his time going home because of the traffic.
A co-worker drove me home. To my surprise, all the bookcases were still standing, and only a few things broke. The worst damage was a sliding closet door that came off its track. The power was still on. The cats were okay, but hiding. They decided that everything was okay now that Mom was home and came out of hiding, and I thought "Ye of misplaced faith". Erik got home about 10(?). We stayed home from work the next day and watched the news. I got sick of the aftershocks really fast; I wanted to scream "Stop it!". Like that would have helped.
My mom came to visit a couple of weeks later. She wanted to feel an aftershock, and I growled at her. Actually she felt two, but didn't realize it: one was when we were on the second floor in Valley Fair Shopping Center, which always felt like an earthquake, and one was when we were asleep.
It took me weeks before I could go down the hall that I was in when the quake hit. It took months before I wasn't scared going under a freeway overpass.