Which wave is primarily responsible for most earthquake damage at Earth's surface?

• A. P-waves
• B. S-waves
• C. Surface Waves
• D. Love Waves

Answer: (C)

Surface waves deliver the strongest ground shaking at Earth's surface. While P-waves (compressional) and S-waves (shear) travel through the interior and arrive first, the shaking that causes the most damage occurs with waves that travel along the ground itself. The free surface and layering of the crust amplify surface waves, boosting their amplitude and lengthening their duration compared to body waves. This results in more intense, longer-lasting movement, including the horizontal shear of Love waves and the rolling motion of Rayleigh waves, which tend to resonate with typical building frequencies. So, even though body waves contribute to the overall shaking, the most damaging surface shaking comes from surface waves—making them the best answer.