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Lab Notes 3

Lab Notes 3 - Seismographs are instruments used to detect...

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Epicenter —the point on the Earth’s surface (location on a map) directly above the focus (underground origin of the earthquake, in bedrock) Seismic waves —elastic waves of vibration and shaking Originate at the earthquake’s focus and travel in all directions through the rock body of Earth and along Earth’s surface Waves are strongest near epicenter and then grow weaker with distance from the epicenter Fault motions (movements of Earth’s crust along breaks in the rocks) are the most common source of earthquakes felt by people These motions can occur along fault that do not break the Earth’s surface or along faults that do break the Earth’s surface
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Unformatted text preview: Seismographs are instruments used to detect these seismic waves and produce a seismogram —a record of seismic wave motions obtained at a specific recording station Body waves P-waves : P for primary, because they travel fastest and arrive at seismographs first They are compressional, or “push-pull” waves S-waves : S for secondary, because they travel more slowly and arrive at seismographs after the P-waves They are perpendicular, shear, or “side-to-side” waves Surface waves: Travel along Earth’s surface Love waves (L-waves) : Surface waves with side-to-side motions Rayleigh waves : Surface waves with elliptical motions...
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