I heard on NPR this morning that the reason the earthquake was felt so far and wide out there is because the bedrock under the east coast is basically just one huge mass. Vibrations will travel the entire length of it because it's old and solid. This is in contrast to the west coast which is much newer (geologically speaking) and full of splits and fissures. Vibrations only travel to the end of the bedrock and then they dissipate, so west coast earthquakes tend to be more localized.

I thought that was interesting.

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