Tomographic resolution of ray and finite-frequency methods: A membrane-wave investigation

Daniel Peter*, L. Boschi, J. H. Woodhouse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The purpose of this study is to evaluate the resolution potential of current finite-frequency approaches to tomography, and to do that in a framework similar to that of global scale seismology. According to our current knowledge and understanding, the only way to do this is by constructing a large set of 'ground-truth' synthetic data computed numerically (spectral elements, finite differences, etc.), and then to invert them using the various available linearized techniques. Specifically, we address the problem of using surface wave data to map phase-velocity distributions. Our investigation is strictly valid for the propagation of elastic waves on a spherical, heterogeneous membrane, and a good analogue for the propagation of surface waves within the outermost layers of the Earth. This amounts to drastically reducing the computational expense, with a certain loss of accuracy if very short-wavelength features of a strongly heterogeneous Earth are to be modelled. Our analysis suggests that a single-scattering finite-frequency approach to tomography, with sensitivity kernels computed via the adjoint method, is significantly more powerful than ray-theoretical methods, as a tool to image the fine structure of the Earth.

Original languageEnglish (US)
Pages (from-to)624-638
Number of pages15
JournalGeophysical Journal International
Volume177
Issue number2
DOIs
StatePublished - Apr 23 2009

Keywords

  • Seismic tomography
  • Surface waves and free oscillations
  • Wave scattering and diffraction

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Fingerprint

Dive into the research topics of 'Tomographic resolution of ray and finite-frequency methods: A membrane-wave investigation'. Together they form a unique fingerprint.

Cite this