“In the east coast, earthquakes are not nearly as common (that’s a good thing!) and usually are smaller. However, the crust in the eastern United States is markedly more efficient at propagating seismic waves than in the western United States (it’s older and colder). This means that for the same magnitude earthquake, the one in the eastern U.S. will be felt much more widely than one in California.”
— Here’s your explanation for why the entire Eastern seaboard felt what was, in relative terms, only a modestly powerful earthquake.
(Source: openhazards.com)
