Wu and his colleagues have studied the small-scale heterogeneities in the crust and upper mantle and their statistical characteristics (modeled as random media) directly (from well-logging data) and indirectly (from seismic wave scattering). He has developed new theories and methods on elastic wave propagation and scattering in complex earth media, on separation scattering effect from intrinsic attenuation, on whole seismogram synthetics, and on diffraction and scattering tomography. He has obtained the power spectra, fractal dimensions and other statistical parameters of lithospheric heterogeneities in several regions of the world and is studying the relation of fractals & chaos to tectonic/geodynamic processes. Influences of diffraction/scattering and random scattering by small-scale heterogeneities to tomography of large-scale structures are also in Wu's research topics.
CURRENT RESEARCH INTERESTS:
- Seismic imaging (including prestack and poststack depth migrations) using one-way wave methods.
- Wave propagation and imaging in wavelet domain: Wavelet-Beamlet migration.
- Seismic wave propagation in inhomogeneous media (including teleseismic, regional and local phases).
- Modeling and synthetics in elastic media and elasto-acoustic media.
- Stochastic treatment of seismic waves in complex media modeled as random media. Large array seismology and source discrimination.
- Tomography, holography, migration and wave field imaging and inversion, including Q-tomography and the newly developed stochastic tomography.
- Seismic wave scattering and attenuation. Separation of the scattering attenuation from the intrinsic attenuation.
- Lithospheric inhomogeneities revealed from seismic wave scattering.
- Coda wave study and earthquake monitoring & prediction.