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Souriau 1986
Souriau, A. (1986). First analyses of broadband records on the geoscope network: potential for detailed studies of mantle discontinuities. Geophysical Research Letters 13: doi: 10.1029/GL013i010p01011. issn: 0094-8276.

Examples of the first analyses of broadband GEOSCOPE data at station SSB (France) detailed study of the deep mantle discontinuities. Analysis of the P-coda of earthquakes using specific methods suggests the existence of P to S conversions at 670 km depth beneath SSB for earthquakes with northern to eastern azimuths; a comparison with results from the NARS and Grafenberg arrays indicate that the 670 km heterogeneous or horizontally discontinuous. A frequency analysis reveals that the relevant discontinuity is not very sharp (~20 to 70 km thick). Besides, a sharp (<5 km thick) discontinuity at 900 km depth is observed beneath the Mid-Atlantic Ridge from P reflections, giving PP precursors, for the strong March 1985 Chilean earthquake, but no 670 km discontinuity seems to be present beneath the Ridge.

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Geophysical Research Letters
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