Local earthquake (LE) tomography with joint inversion for P‐ and S‐wave velocities using structural constraints

Ari Tryggvason; Niklas Linde

doi:10.1029/2005gl025485

journal article Apr 01, 2006

Local earthquake (LE) tomography with joint inversion for P‐ and S‐wave velocities using structural constraints

Ari Tryggvason Niklas Linde

Geophysical Research Letters Vol. 33 No. 7 · American Geophysical Union (AGU)

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Abstract

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.

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Details

Published: Apr 01, 2006
Vol/Issue: 33(7)
License: View

Authors

A

Ari Tryggvason

Department of Earth Sciences Uppsala University Uppsala Sweden

N

Niklas Linde

Department of Earth Sciences Uppsala University Uppsala Sweden

Cite This Article

Ari Tryggvason, Niklas Linde (2006). Local earthquake (LE) tomography with joint inversion for P‐ and S‐wave velocities using structural constraints. Geophysical Research Letters, 33(7). https://doi.org/10.1029/2005gl025485

Local earthquake (LE) tomography with joint inversion for P‐ and S‐wave velocities using structural constraints

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