Watch the waves from the M7.7 Caribbean earthquake roll across the USArray Transportable Array seismic network (http://www.usarray.org )! This animation, called a Ground Motion Visualization (GMV), shows the motion of the ground as detected on USArray seismometers - each dot is a seismic station and when the ground moves up it turns red and when it moves down it turns blue. Waves generated by an earthquake travel around and through the earth, but they get smaller (attenuate) as they move away fr