Statistics – Computation
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3307303t&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 7, CiteID L07303
Statistics
Computation
12
Exploration Geophysics: Computational Methods: Seismic, Seismology: Tomography (6982, 8180)
Scientific paper
In local earthquake (LE) tomography for P- and S-wave velocities (or Vp/Vs ratios), constraints punishing deviations from a given Vp/Vs ratio are often used. In a synthetic model test we demonstrate that though such constraints inhibit unreasonable Vp/Vs ratio variations, they bias the resulting Vp/Vs ratios. As an alternative approach, structural constraints based on the cross-product of the model gradients can be used to constrain the joint P- and S-wave inversion. We show that the resulting models are as low in artifacts as if a Vp/Vs damping was used, but the resulting Vp/Vs ratios are less biased, which is important for a quantitative interpretation of physical properties and processes in the Earth.
Linde Niklas
Tryggvason Ari
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