### 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 SiO_{2} 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 language | English (US) |
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State | Published - Jan 1 2003 |

Event | 2003 Society of Exploration Geophysicists Annual Meeting, SEG 2003 - Dallas, United States Duration: Oct 26 2003 → Oct 31 2003 |

### Other

Other | 2003 Society of Exploration Geophysicists Annual Meeting, SEG 2003 |
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Country | United States |

City | Dallas |

Period | 10/26/03 → 10/31/03 |

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### ASJC Scopus subject areas

- Geophysics

### Cite this

*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.

**P- And S-wave seismic modeling of the shallow subsurface across the Cheyenne belt in the Sierra Madre Mountains.** / Shoshitaishvili, Elena; Johnson, Roy A.

Research output: Contribution to conference › Paper

}

TY - CONF

T1 - P- And S-wave seismic modeling of the shallow subsurface across the Cheyenne belt in the Sierra Madre Mountains

AU - Shoshitaishvili, Elena

AU - Johnson, Roy A

PY - 2003/1/1

Y1 - 2003/1/1

N2 - 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.

AB - 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.

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M3 - Paper

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