If it's a hurricane such as Irene, or a big snowstorm, everyone knows it's on the way and will make travel a mess during and after it hits. But did anyone ever consider what an East Coast earthquake could do to airline and train service from North Carolina to New England? We found out yesterday when, as was widely reported, an earthquake centered in central Virginia rattled the region. Those using PHL were delayed when all air traffic was temporarily halted. Here is an AP story with more detail on the disruptions throughout the region.