Crustal Refraction Experiment: Yellowknife 1966
| Autor: | K. G. Barr |
|---|---|
| Rok vydání: | 1971 |
| Předmět: |
Atmospheric Science
Ecology Significant difference Paleontology Soil Science Forestry Crust Aquatic Science Oceanography Precambrian Geophysics Wide area Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Refraction (sound) Seismology Geology Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research. 76:1929-1947 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jb076i008p01929 |
| Popis: | A crustal refraction experiment was carried out around Yellowknife, Northwest Territories, in 1966. The pattern of shots and stations was designed for time-term interpretation over a wide area, traversed by a more detailed line of interspersed shots and stations. The records were unusually simple, and nearly all arrival could be explained by a shallow surface layer (3.5±1.2 km at 5.5 km/sec) overlying a uniform crust (6.1±0.04 km/sec). No significant difference was found between the crustal thicknesses under the Slave and Churchill Precambrian provinces, but they are separated by a narrow belt corresponding to the east arm of Great Slave Lake, under which the crust is about 4 km thicker. The structural interpretation is supported by a study of the amplitudes of Pn. The upper mantle velocity west of the Precambrian margin (8.23±0.04 km/sec) was found to be higher than that east of the margin (8.10±0.03 km/sec). This may be related to an orogenic belt parallel to but west of the margin in late Aphebian time. |
| Databáze: | OpenAIRE |
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