Because CA has so many quakes, the ground is rather cracked and broken, so it doesn’t propagate seismic waves so well. Small quakes feel relatively larger where the ground is more intact. A mid-3s quake is felt over much more of the East Coast than a 4 is felt in LA. CO is relatively unscathed by quakes, so the same effect may apply here, too. (But, I slept through this one.)
I was in Richmond, VA when the DC quake hit — it felt pretty strong — a shudder followed by shakng.
Everyone in the room was asking me “What do we do? What do we do?”
“Get under the damn desk!” I said from under the desk.
Those drop ceilings are dangerous.