Typically fewer than 20 major and great earthquakes (magnitudes of 7 and higher)each year account for more than 90 percent of the energy released by earthquakes.
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Q16: With their up-and-down and side-to-side motions,S-waves shake
Q17: The velocity of an S-wave depends on
Q18: The shaking produced by Rayleigh waves causes
Q19: Passing through the mantle below the asthenosphere,the
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