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 conferencePaper

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)
StatePublished - Jan 1 2003
Event2003 Society of Exploration Geophysicists Annual Meeting, SEG 2003 - Dallas, United States
Duration: Oct 26 2003Oct 31 2003

Other

Other2003 Society of Exploration Geophysicists Annual Meeting, SEG 2003
CountryUnited States
CityDallas
Period10/26/0310/31/03

ASJC Scopus subject areas

  • Geophysics

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    Shoshitaishvili, E., & Johnson, R. A. (2003). P- And S-wave seismic modeling of the shallow subsurface across the Cheyenne belt in the Sierra Madre Mountains. Paper presented at 2003 Society of Exploration Geophysicists Annual Meeting, SEG 2003, Dallas, United States.