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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online