Earth, Seismic-wave velocity profiles
The techniques of deep seismic sounding, carried out mainly in the United States and western Europe, have yielded high-resolution velocity profiles for the crust and uppermost mantle since the late 1960s. These studies, complemented by detailed waveform analyses and seismic tomography, prove conclusively that the crust and upper mantle can vary significantly in
posted by QuickFeather @ 5:04 PM
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