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- W1570458186 abstract "Seismic waves generated by 10 chemical explosions in Lake Superior were recorded by the U.S. Geological Survey at intervals of approximately 30 km along a line 1400 km in length, from Lake Superior, Wisconsin, to Denver, Colorado. First arrivals recorded along this line can be expressed as: T 1 = Δ/5.5 sec (assumed), T 2 = 3.4 + Δ/7.2 sec, T 3 = 8.6 + Δ/8.2 sec, and T 4 = 12.8 + Δ/8.5 sec, where Δ is distance in kilometers. These data indicate a two-layer crust 50 km thick. The upper-mantle velocity is 8.2 km/sec. The 8.5-km/sec apparent velocity observed as first arrivals appears to be a refracted wave from a layer in the upper mantle at a depth of 105 km. The attenuation of P waves propagating in the upper mantle is extremely low in the Central Lowlands and the Great Plains. The data do not indicate the existence of a ‘shadow zone’︁ attributed to a Gutenberg low-velocity layer for P waves in the upper mantle." @default.
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- W1570458186 date "2013-04-03" @default.
- W1570458186 modified "2023-09-27" @default.
- W1570458186 title "Seismic-Wave Propagation in the Upper Mantle: Lake Superior, Wisconsin, to Denver, Colorado" @default.
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- W1570458186 doi "https://doi.org/10.1029/gm010p0270" @default.
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