Primary or compressional waves (P waves) address particles moveing back and forth in the same focus as the waves are traveling , secondary or transverse hook waves (S waves) tear vibrations perpendicular to their direction of travel. P waves always travel at higher velocities than S waves. Three general classes of earthquakes are instantly recognized as tectonic, volcanic, and artificially produced. The tectonic sorting is by far the most destructive. The most commen ca...If you want to put a full essay, order it on our website: OrderEssay.net
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