Virginia Tech Global Seismological Lab


3056A Derring Hall (Mail Code 0420)
Department of Geosciences, Virginia Tech, Blacksburg, VA 24061

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Surface-wave Finite-Frequency Theory

Surface-wave tomography based upon great-circle ray theory has been used with great success during the past three decades to constrain large-scale heterogeneities in the lithosphere and upper mantle. However, ray theory is a high-frequency approximation, it breaks down whenever the length scale of the heterogeneity is compatible to the characteristic wavelength of seismic waves. To improve global tomographic resolution in the upper mantle, we developed finite-frequency theory for surface waves based on a single scattering (Born) approximation.
Example 3D sensitivity kernels for 10 mhz Love wave phase delay

References

  • Ying Zhou, F.A.Dahlen and Guust Nolet (2004). "3-D sensitivity kernels for surface-wave observables", Geophysical Journal International, 158, 142-168. pdf

  • Tony Dahlen and Ying Zhou (2006). "Surface-wave group-delay and attenuation kernels", Geophysical Journal International, 165,545-554. pdf

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    Ying Zhou June 2012