A seismic wave that moves the ground up and down. Secondary wave. A secondary wave, or S-wave, is a type of seismic wave that shakes the ground perpendicular to its direction of travel, causing up-and-down or side-to-side motion.
Secondary Wave: A seismic wave that moves the ground up and down. Secondary wave. A secondary wave, or S-wave, is a type of seismic wave that shakes the ground perpendicular to its direction of travel, causing up-and-down or side-to-side motion.
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