Historically, velocity model building for PS imaging has been done sequentially, starting with estimation of P-velocity and anisotropic parameters using PP data alone, followed by updates of S-velocity to match PS and PP depth images. A better option is to include both PP and PS data in model building from the start and find the model that satisfies both data types, producing flat events on gathers and PP and PS images with consistent depths.

We implemented a new method for joint PP/PS tomography in which moveout picks on PP and PS depth gathers are combined with floating event constraints between PP and PS images to simultaneously solve for Vp, Vs, and anisotropic parameters ( ). Our method is an improvement on previous approaches that require separate treatment of PP and PS data in the early stages of model building, allowing the use of combined PP and PS data throughout the model-building process. Benefits of the joint PP/PS tomography include improved efficiency, reduced uncertainty, and better resolution of anisotropy.


Article metrics loading...

Loading full text...

Full text loading...


  1. Bale, R., Farmer, P., Hansen, J., Nichols, D. and Palacharla, G.
    [1998] Prestack depth migration of converted wave data in anisotropic media. 68th Annual International Meeting, SEG, Expanded Abstracts, 1108–1111.
    [Google Scholar]
  2. Mathewson, J., Woodward, M., Nichols, D., Xu, C. and Leone, C.
    [2013] Joint PP/PS tomography with floating event constraints. 83rd Annual International Meeting, SEG, Expanded Abstracts, 1649–1653.
    [Google Scholar]
  3. Stewart, R., Gaiser, J., Brown, R., and Lawton, D.
    [2003] Converted-wave seismic exploration: Applications. Geophysics68(1), 40–57.
    [Google Scholar]
  4. Stopin, A. and Ehinger, A.
    [2001] Joint PP PS tomographic inversion of the Mahogany 2D–4C OBC seismic data. 71st Annual International Meeting, SEG, Expanded Abstracts, 837–840.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error