up to 14 kilometers PER SECOND Seismic Waves and Earth's Interior P-waves and S-waves seismic wave velocities in the subsurface Seimic Waves and Earth's Interior Waves and interior. Source seismic wave travels at 1 kilometer per second Source Seismic Waves and Earth Interior seismic wave travels at 1 kilometer per second Seismic Waves and Earth's Interior Reference Seismic Waves and Earth's Interior Seimic Waves and Earth's Interior Seimic Waves and Earth's Interior Source Seismologiniai tyrimai Seimic Waves and Earth's Interior Image Source P-waves and S-waves