p- and S-wave seismic modeling of the shallow subsurface across the cheyenne belt in the sierra madre mountains

Elena Shoshitaishvili, Roy A Johnson

Research output: Contribution to journalArticle

Abstract

We used multicomponent seismic reflection/refraction data to determine seismic velocities, Poisson's ratios and geometries of shallow subsurface structures across the Cheyenne Belt, an Archean-Proterozoic boundary in southeastern Wyoming. The travel-times of P-wave first arrivals were inverted to obtain a model of both P-wave velocity and subsurface geometry. Since S-wave data quality was inferior to that of the P-wave data and S-wave ray coverage of the subsurface was discontinuous, we proposed a method to estimate Poisson's ratio using SiO2 concentration and the average atomic weight (AAW) of a formation with known mineral and oxide compositions. Subsequently, the final P-wave velocity model was converted into an initial S-wave model using Poisson's ratios estimated by this method. The S-wave data were inverted for velocities only, keeping the subsurface geometry derived from P-wave inversion constant. The inversion of P- and S-wave travel times resulted in a shallow subsurface model of rock properties, which was interpreted based on surface geology and Poisson's ratio variations to provide a near-surface geological structure model.

Original languageEnglish (US)
Pages (from-to)1825-1828
Number of pages4
JournalSEG Technical Program Expanded Abstracts
Volume22
Issue number1
DOIs
StatePublished - Jan 1 2003

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ASJC Scopus subject areas

  • Geophysics
  • Geotechnical Engineering and Engineering Geology

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