Surface Wave Dispersion in Seismic Exploration
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
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
•
Submarine Geology – Bikini Atoll
•
Ground roll
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.
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.
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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.
