A Three-Component Seismic Refraction Survey in Northwestern Arizona
Abstract
Three-component seismic refraction data were recorded in northwestern Arizona in the Transition Zone between the Colorado Plateau and Basin and Range provinces. A 35.4 km array received shots from both these provinces. Seismograms from the southwest shots show two prominent reflections, indicating a reflector about 20 km deep and Moho depths of 26.5-29 km in the Basin and Range and 29-31 km in the Transition Zone. A weak PmP from the northeast suggests the crust or Moho in the Colorado Plateau has different characteristics than in the Basin and Range. Raytracing yields Pn and Sn velocities of 7.95 km/s and 4.59 km/s for the Transition Zone and shows evidence of laterally increasing Pn and Sn velocities toward the Basin and Range and the Colorado Plateau. Clear Pg and Sg arrivals reveal a low Poisson's ratio of 0.217 for the upper crust of the Colorado Plateau. (edc)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1989
- Accession Number
- ADA216999
Entities
People
- Vivian K. Hussey
Organizations
- Air Force Research Laboratory