Closest one to me was when I lived on Dublin, CA. On the weekend the Space Shuttle crashed, two 4.2 s happened about 2 hours apart right underneath Chevron HQ property about 2 miles away. The ground moved about 10 feet. I tell people the sensation is like when you would stand on those glider seats ( hope you know what I'm talking about). Previously on that fault, we had a swarm of over 150 between Sunday and Thanksgiving. Only about 5 we able to be felt with the largest a 3.1. Felt a 5 about 30 mules away once, that one lasted 15 seconds.