Further evidence for the `Lay discontinuity' beneath northern Siberia and the North Atlantic from short-period P-waves recorded in France

Details Further evidence for the `Lay discontinuity' beneath northern Siberia and the North Atlantic from short-period P-waves recorded in France Further evidence for the `Lay discontinuity' beneath northern Siberia and the North Atlantic from short-period P-waves recorded in France

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...72..264h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 72, Issue 3-4, p. 264-275.

Physics

25

Scientific paper

We analyze data from the French Laboratoire de Detection Geophysique (LDG) network of digital short-period seismic stations. The P-waves from several earthquakes in the Kuril-Okhotsk region display clear secondary arrivals in the 75-85° range, which are not explained by smooth lower mantle models. The move-out of the arrivals across the network indicates a deep mantle origin. We interpret them as waves reflected off, or transmitted at, the `Lay discontinuity', about 300 km above the core-mantle boundary. The bounce points at this discontinuity are located beneath northern Siberia, slightly to the northwest of the region for which a similar structure has been reported. We propose tools for investigating the lateral variations of the D'' structure on the scale 100-1000 km. The method we propose is based on the deconvolution of the data, or convolution of synthetics, by a source time function derived from the data. We show that the method helps identification of the waves that interact with the `Lay discontinuity', and enables a more objective mapping of its lateral variations. Evidence for bumps a few kilometers high on the lateral scale of a few tens of kilometers is proposed. We also probe a spot of the lower mantle beneath the North Atlantic. A detailed analysis of the waveforms from a Chiapas earthquake suggests that the `Lay discontinuity' is also present in that part of the world.

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