Watch how Costa Rica quake vibrations rattled beneath US

We’d like to thank our reader, Bill Bartlett, for bringing this one to our attention.

You couldn’t feel it, but the 7.6 earthquake that rocked Costa Rica on September 5th sent shockwaves through the United States.

This USArray Ground Motion Visualization shows waves from the Costa Rican earthquake rattling the earth beneath the US. Blue means downward ground motion while red represents upward ground motion with the darker colors indicating larger amplitude.

Credit: IRIS