Understanding Surface Wave Dispersion in Seismic Exploration
Surface wave dispersion, explored by James Crane and Bolu Owolana, plays a crucial role in seismic studies. This phenomenon, involving waves spreading at varying speeds, helps evaluate subsurface characteristics based on wavelength. By studying surface waves, researchers can determine velocity, density, and elastic properties, making them a valuable asset in seismic exploration.
- Surface Wave Dispersion
- Seismic Exploration
- Subsurface Characteristics
- Surface Waves
- Seismic Studies
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
Surface Wave Dispersion James Crane Bolu Owolana
Outline Introduction History Concept Examples Conclusions
Intro What is a surface wave Types Rayleigh waves are used for inversion
History Earliest theoretic study of dispersion was made by Love. Many years later Lord Rayleigh worked out the theory of wave propagation along free surface with retrograde elliptical motion http://slam.asu.edu/images/seismogram.gif
Concept Dispersion: waves spreading out at different velocities. Group vs. Phase velocity
Dispersion Phase/group velocities vary with wavelength Can be used to evaluate subsurface characteristics because the depth of investigation is wavelength dependent longer wavelengths reflect the depths to which they travel Shorter wavelengths provide crucial information about the shallow subsurface
Examples Earthquakes
Underwater explosions Depth charges set off Noticed dispersion on the pressure wave High frequency (short wavelength) arrived first indicating a high velocity
Conclusion Surface waves are useful in determining velocity, density, elastic properties. Surface waves can be a useful by-product of seismic exploration rather than a waste product.
