L12_WavesAndRays-page6

L12_WavesAndRays-page6 - greater. Also, if velocity...

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Applied Geophysics – Waves and rays - I Velocity sensitivity The amplitude of wave motion decreases with depth Î Related to depth/wavelength Î Longer wavelengths sample deeper Oceanic lithosphere Seismic velocity generally increases with depth. Surface waves are dispersive , which means their velocity is dependent on their wavelength. This is because longer wavelength sample deeper where the velocity is
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Unformatted text preview: greater. Also, if velocity increases with depth, longer wavelengths arrive first (This fig is for water-waves) Applied Geophysics Waves and rays - I Source spectrum This is the range of frequencies within the source pulse Try to avoid frequencies where there is significant noise e.g. 50 Hz Sources: Shotgun Hammer Explosive Air gun higher to lower frequency...
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