![]() When consulting the seismogram, P-waves always appear before S-waves, as they travel faster and can travel through three states of matter as opposed to one. The following animation helps to understand the motion of each type of wave.Ī seismogram is the graph output from a seismograph, which is used to determine the epicenter of an earthquake. S-waves can pass through solids but not through liquids or gases They travel perpendicular to the vibration of the particles They travel slower than P-waves and are the second wave to arrive S-waves can also be characterized by some unique properties: These waves are also referred to as secondary or shear waves. ![]() The second type of wave to consider when determining the epicenter of an earthquake is the S-wave. ![]() They travel through solids, liquids, and gases The particles that the wave passes through move in the same direction as the wave itself (pushing and pulling motion) They are the fastest of the seismic waves and are the first to arrive Important characteristics of P-waves are: These waves are also referred to as primary or compressional waves. The first type of wave to consider when determining the epicenter of an earthquake is the P-wave. The location of an earthquake's epicenter (point on the earth's surface directly above the location of rupture or faulting) can be determined using information about two of these seismic waves. Seismology is the study of earthquakes, their effects, and seismic waves.
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