S Wave 4
S Wave 4 :
A seismic body wave that involves a shearing ground motion (shakes the ground back and forth - without volume change) perpendicular (transverse) to the direction of wave propagation. When it is resolved into two orthogonal components in the plane perpendicular to the direction of propagation, SH denotes the horizontal component and SV denotes the vertical component. S waves travel slower than P waves. Accordingly, they arrive later in the seismic record of a seismic event (S stands for "unda secunda" = secondary wave)
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