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The paths curve because the different rock types found at different depths change the speed at which the waves travel. Solid lines marked P are compressional waves; dashed lines marked S are shear waves. S waves do not travel through the core but may be converted to compressional waves (marked K) on entering the core (PKP, SKS).
The sharp decline in P-wave velocity at the mantle-core boundary suggests a liquid outer core, transitioning from 7.7 km/s in the mantle to 4 km/s in the outer core. [59] The inability of S-waves to traverse this zone further confirms its fluid nature with molten iron sulphate .
English: Plot of latitude vs Earth rotation tangential speed in m/s, km/h, mph and Mach number (assuming 300 m/s speed of sound). The dashed (blue) line shows that the tangential speed of Cape Canaveral is around 408 m/s. The dot-dash (green) line denotes typical airliner cruise speeds.
[3]: 48–50 [4]: 56–57 Body waves and surface waves. Other modes of wave propagation exist than those described in this article; though of comparatively minor importance for earth-borne waves, they are important in the case of asteroseismology. Body waves travel through the interior of the Earth. Surface waves travel across the surface.
Seismic waves would travel in straight lines if Earth was of uniform composition, but structural, chemical, and thermal variations affect the properties of seismic waves, most importantly their velocity, leading to the reflection and refraction of these waves. The location and magnitude of variations in the subsurface can be calculated by the ...
Reverted to version as of 23:25, 19 November 2022 (UTC), "Earth" is a proper name and uppercased on Wikipedia: 04:57, 26 March 2023: 2,200 × 1,360 (2.35 MB) Xiphosura: Reverted to version as of 17:10, 5 February 2014 (UTC) Capital E has terrible placement, and I do not understand why useful labels had to be removed. The edit was entirely ...
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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.