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9 1 Understanding Earth Through Seismology Physical Geology 2nd Edition P waves travel more slowly in the outer core than in the lower mantle Liquids do not transmit S waves The S wave shadow zone is caused by the _____ the crustmantle boundary the outer core the lower mantle the inner core The Swave shadow zone extends from _____ to 180 o angular distance from the earthquake focus on one side and from _____ to 180 o on the other 45 degreesFor this reason, there is also an S wave shadowzone The slower seismic surface waves do not penetrate the earth's interior, but follow the surface One type of surface wave, the Love wave, travels in a circular motion and causes damage by displacing materials horizontally Love waves can be very damaging This cracked pavement and these twisted railroad tracks clearly demonstrate S wave shadow zone definition