This is incredible and really shows how vibration waves work. -M

What you’re seeing here are vertical displacement measurements from an array of detectors that are part of the USArray/EarthScope facility you can read more about the array and the animation on the IRIS website. These are very sensitive instruments; note the scale on the lower graph showing the motion is only about 40 microns top-to-bottom! That’s less than the thickness of a human hair.

via Virginia earthquake waves ripple across the US! | Bad Astronomy | Discover Magazine.

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