At higher frequencies yet, both the phase velocity and the group velocity converge towards the Rayleigh wave velocity-the phase velocity from above, and the group velocity from below.
32.
Humans should be able to detect such Rayleigh waves through their Pacinian corpuscles, which are in the joints, although people do not seem to consciously respond to the signals.
33.
Spheroidal modes only involve P and SV waves ( like Rayleigh waves ) and depend on overtone number n and angular order l but have degeneracy of azimuthal order m.
34.
This slow decay is one reason why they are of particular interest to seismologists; Rayleigh waves can circle the globe multiple times after a large earthquake and still be measurably large.
35.
Rayleigh waves are widely used for materials characterization, to discover the mechanical and structural properties of the object being tested & ndash; like the presence of cracking, and the related shear modulus.
36.
Rayleigh waves are generated by the interaction of P-and S-waves at the surface of the earth, and travel with a velocity that is lower than the P-, S-, and Love wave velocities.
37.
After the 2004 Indian Ocean earthquake, some people have speculated that Rayleigh waves served as a warning to animals to seek higher ground, allowing them to escape the more slowly traveling tsunami.
38.
He also discovered the phenomenon now called Rayleigh scattering, which can be used to explain why the sky is blue, and predicted the existence of the surface waves now known as Rayleigh waves.
39.
For periods up to 300 s, the vertical displacement corresponds to Rayleigh waves generated like the primary microseisms, with the difference that it involves the interaction of infragravity waves with the ocean bottom topography.
40.
Geophysical techniques used for subsurface exploration include measurement of seismic waves ( pressure, shear, and Rayleigh waves ), surface-wave methods and / or downhole methods, and electromagnetic surveys ( magnetometer, resistivity, and ground-penetrating radar ).
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