| 1. | Since Rayleigh waves decay slowly, they should be detectable over long distances.
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| 2. | The Rayleigh waves used for this purpose are in the ultrasonic frequency range.
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| 3. | This occurs because a Rayleigh wave of lower frequency has a relatively long wavelength.
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| 4. | In particular, some biologists theorize that elephants may use vocalizations to generate Rayleigh waves.
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| 5. | Rayleigh waves thus often appear spread out on seismograms recorded at distant earthquake recording stations.
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| 6. | Rayleigh waves on ideal, homogeneous and flat elastic solids show no dispersion, as stated above.
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| 7. | Some animals seem to use Rayleigh waves to communicate.
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| 8. | You can get these Rayleigh waves at different frequencies,
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| 9. | It is also possible to observe Rayleigh wave dispersion in thin films or multi-layered structures.
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| 10. | Note that these Rayleigh waves have a much higher frequency than Rayleigh waves generated by earthquakes.
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