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  2. Seismic wave - Wikipedia

    en.wikipedia.org/wiki/Seismic_wave

    P wave and S wave from seismograph Velocity of seismic waves in Earth versus depth. [1] The negligible S-wave velocity in the outer core occurs because it is liquid, while in the solid inner core the S-wave velocity is non-zero. A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body.

  3. P wave - Wikipedia

    en.wikipedia.org/wiki/P_wave

    Typical values for P wave velocity in earthquakes are in the range 5 to 8 km/s. The precise speed varies according to the region of the Earth's interior, from less than 6 km/s in the Earth's crust to 13.5 km/s in the lower mantle, and 11 km/s through the inner core. [6]

  4. Seismic velocity structure - Wikipedia

    en.wikipedia.org/wiki/Seismic_Velocity_Structure

    [18] [19] P-waves, which can move through all states of matter and provide data on a range of depths, change speed based on the material's properties, such as type, density, and temperature. [ 3 ] [ 1 ] S-waves, in contrast, are constrained to solids and reveal information about the Earth's rigidity and internal composition, including the ...

  5. Earthquake - Wikipedia

    en.wikipedia.org/wiki/Earthquake

    An earthquake's point of initial rupture is called its hypocenter or focus. ... P wave speed. Upper crust soils and unconsolidated sediments: 2–3 km (1.2–1.9 mi ...

  6. Seismogram - Wikipedia

    en.wikipedia.org/wiki/Seismogram

    The P wave is the first wave that is bigger than the other waves (the microseisms). Because P waves are the fastest seismic waves, they will usually be the first ones that the seismograph records. The next set of seismic waves on the seismogram will be the S waves. These are usually bigger than the P waves, and have higher frequency.

  7. Seismic tomography - Wikipedia

    en.wikipedia.org/wiki/Seismic_tomography

    Other phases of P waves are used to image the deeper mantle and core. In areas with limited seismograph or earthquake coverage, multiple phases of S waves can be used for tomographic models. These are of lower resolution than P wave models, due to the distances involved and fewer bounce-phase data available.

  8. What causes earthquakes? The science behind why seismic ... - AOL

    www.aol.com/causes-earthquakes-science-behind...

    In January, the USGS estimated that nearly 75% of the U.S. could experience a damaging earthquake in the next century. The prediction is based on research done by dozens of scientists and ...

  9. Receiver function - Wikipedia

    en.wikipedia.org/wiki/Receiver_function

    Receiver functions use Snell's law refraction of P waves and converted S waves to estimate the depth of the Moho. They are only generated clearly if the central angle (angle subtended at the center of the Earth) between the seismic event and the seismograph station is between 30 and 95 degrees (between about 3300 and 8900 km separation). [ 4 ]