Seismic-refraction measurements of crustal structure between American Falls Reservoir, Idaho, and Flaming Gorge Reservoir, Utah
Crustal Studies Technical Letter
21
In cooperation with the Defense Advanced Research Projects Agency
By: Ronald Willden
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Abstract
Interpretation of a reversed seismic-refraction profile recorded between American Falls reservoir and Flaming Gorge reservoir in May 1963 indicates that the depth to the Mohorovicic discontinuity is about 31 km at American Falls and 37 km at Flaming Gorge. The existence of an intermediate crustal layer at a depth of about 19 to 21 km beneath the profile is well supported by refractions and reflections. The velocity of compressional waves in the mantle just beneath the Mohorovicic discontinuity is about 7.8 km/sec, their velocity in the intermediate layer is about 6.9 km/sec, and their velocity in the upper crust (beneath the near-surface low-velocity material) is about 5.9 km/sec. A prominent phase with an apparent velocity of 8.4 km/sec was recorded at distances of 210 km to 325 km from shots at American Falls. This phase is believed to be a reflection from a boundary within the mantle.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Unnumbered Series |
| Title | Seismic-refraction measurements of crustal structure between American Falls Reservoir, Idaho, and Flaming Gorge Reservoir, Utah |
| Series title | Crustal Studies Technical Letter |
| Series number | 21 |
| DOI | 10.3133/70043606 |
| Year Published | 1964 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center, Menlo Park Science Center |
| Description | 37 p. |
| Country | United States |
| State | Idaho;Utah |
| Other Geospatial | American Falls Reservoir;Flaming Gorge Reservoir |
| Online Only (Y/N) | Y |
| Google Analytic Metrics | Metrics page |