This image from the US Geological Survey shows you the most recent earthquakes in the "lower 48" of the USA. I know that some of you find us Californians unsympathetic, especially to those of you more distant from the epicenter, but if you look at how often the earth moves here, you'll realize why. I lived away from CA for many years and shortly after I came back, I remember being awakened one night by a shaker. My internal Richter scale calibrated it as around a 3.5 or 4 so I rolled over and went back to sleep.
The geology is different too. The younger crust in the west dampens the shake sooner, so (for example) the 7.2 Mexicali earthquake in 2010, more than 10x the magnitude of yesterday's Virginia quake, was dampened to a long, long roll in San Diego, just 100 miles away. Very noticeable, enough to roll some things off tables, but not with the sharp jerks and pitches of a nearby earthquake. Mexicali was badly damaged, but it was localized. On the other hand, a 7.0 earthquake in Haiti caused national devastation there.
Now, let's go to the doorway thing. Turns out that standing in a doorway is NOT the preferred spot. Experts recommend getting under something sturdy, like a table. On earthquake practice days, I've been known to insist that 15 people in a meeting with me crawl under the table to continue the conference when the "event" occurs. The biggest danger (particularly in houses) is stuff coming off shelves and breaking on you, not the house coming down. Keep shoes around so you aren't walking in broken glass. But running outside is much worse, because of collapsing glass and masonry. So stay inside till the shaking stops! Be prepared to survive 2-3 days with no help, and known how to turn off the water and the gas. Remember, the worst destruction in 1906 San Francisco was due to fire. (Oh yes, both my grandmothers went through that one.)
I am very glad, given the different geology, and different building codes, that everyone came through safely. I'm sad about the National Cathedral and other damaged buildings, but buildings aren't important: people are. I' m amused that the epicenter was in uber-Republican Eric Cantor's district. Remember he wants to cut funding for the USGS, along with other scientific research. Now, has anyone blamed it on the gays yet?