A Preliminary Shear Velocity Model for Central Asia

Abstract

Waveforms of S body waves and Rayleigh waves are analysed with the method of partitioned waveform inversion, with the objective to develop a three- dimensional S-velocity model for the crust and upper mantle below Central Asia. Thus far, 103 seismograms have been processed. Using starting models with crustal thicknesses representative for the source-receiver path, good predictions of the observed waveforms, and good fits, have been obtained. The preliminary model, constructed on the basis of the data collected, shows that the Indian craton is marked by distinctly higher velocities than the rest of the region between 45 and at least 100 km depth. The Tarim craton and the Sino- Korean craton do not show high velocities at this depth. The Tibetan Plateau shows low velocities between 70 and 200 km depth. Propagation, Regional phases, Heterogeneity, Surface wave, Inversion.

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Document Details

Document Type
Technical Report
Publication Date
Dec 24, 1993
Accession Number
ADA274972

Entities

People

  • Alet Zielhuis
  • Brian L. Kennett

Organizations

  • Australian National University

Tags

DTIC Thesaurus Topics

  • Asia
  • Central Asia
  • Data Sets
  • Digital Data
  • Earth Sciences
  • Frequency
  • Heterogeneity
  • Inversion
  • Nuclear Explosions
  • Path Integrals
  • Rayleigh Waves
  • Surface Waves
  • Thickness
  • Three Dimensional
  • Waveforms
  • Waves

Readers

  • Seismology