Preliminary interpretation of a seismic-refraction profile across the Large Aperture Seismic Array, Montana
Open-File Report
68-15
By: C.A. Borcherdt and John C. Roller
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Abstract
A reversed seismic-refraction profile extending northeastward from Greycliff, Montana, across the Large Aperture Seismic Array (LASA) to Charleson, North Dakota, indicates that the crust of the earth consists of two layers with P-wave velocities of 6.1 km/sec and 6.7 km/sec, and that the upper-mantle velocity is 8.3 km/sec. The Mohorovicic discontinuity is 50-km deep at Charleson and remains at nearly the same depth southwestward for a distance of about 300 km, from where it slopes upward to the southwest at about 2° to a depth of 41 km near Greycliff, Montana.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary interpretation of a seismic-refraction profile across the Large Aperture Seismic Array, Montana |
| Series title | Open-File Report |
| Series number | 68-15 |
| DOI | 10.3133/ofr6815 |
| Year Published | 1968 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 55 p. |
| Country | United States |
| State | Montana |