TY - JOUR
T1 - Combined first arrival, Rayleigh wave, and P-SV converted wave analysis for improved hydrologic characterization
AU - Clair, James St
AU - Liberty, Lee
N1 - Publisher Copyright:
© 2019 SEG
PY - 2019/8/10
Y1 - 2019/8/10
N2 - We integrate vertically polarized P-SV converted bedrock refraction phase arrivals with first arrival and Rayleigh wave signals to estimate soil, fluid and rock properties at a shallow bedrock site near Crested Butte, CO. We validate our results with a synthetic elastic model. By combining the bedrock Vs refraction results with shallow Vs derived from Rayleigh wave inversion results, we obtain a composite Vs model that is integrated with our Vp model for hydrologic interpretation. The resulting analysis reveals zones of high Vp/Vs that we interpret as a perched aquifer setting within colluvium. The sediments overlie weathered and/or fractured shale. We suggest that P-SV phases are commonly observed in shallow bedrock seismic data and that robust bedrock Vs measurements can be obtained in environments where Vs-derived Rayleigh wave estimates may fail.
AB - We integrate vertically polarized P-SV converted bedrock refraction phase arrivals with first arrival and Rayleigh wave signals to estimate soil, fluid and rock properties at a shallow bedrock site near Crested Butte, CO. We validate our results with a synthetic elastic model. By combining the bedrock Vs refraction results with shallow Vs derived from Rayleigh wave inversion results, we obtain a composite Vs model that is integrated with our Vp model for hydrologic interpretation. The resulting analysis reveals zones of high Vp/Vs that we interpret as a perched aquifer setting within colluvium. The sediments overlie weathered and/or fractured shale. We suggest that P-SV phases are commonly observed in shallow bedrock seismic data and that robust bedrock Vs measurements can be obtained in environments where Vs-derived Rayleigh wave estimates may fail.
UR - http://www.scopus.com/inward/record.url?scp=85121855532&partnerID=8YFLogxK
U2 - 10.1190/segam2019-3216844.1
DO - 10.1190/segam2019-3216844.1
M3 - Conference article
AN - SCOPUS:85121855532
SN - 1052-3812
SP - 4839
EP - 4843
JO - SEG Technical Program Expanded Abstracts
JF - SEG Technical Program Expanded Abstracts
T2 - Society of Exploration Geophysicists International Exposition and 89th Annual Meeting, SEG 2019
Y2 - 15 September 2019 through 20 September 2019
ER -