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Answer:
That would be the P-waves, or Primary waves, also known as Compressional waves. These are the fastest seismic waves and arrive at the given location first because they can travel through both solid and liquid rock. They are longitudinal (push-pull) waves that cause the particles in the rock to vibrate back and forth in the direction that the wave is traveling. These waves are usually detected by seismographs as a sharp spike on the seismogram and they give us information about the size, depth, and location of the earthquake.