Investigating D′′ structure beneath the North Atlantic

Details Investigating D′′ structure beneath the North Atlantic Investigating D′′ structure beneath the North Atlantic

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pepi..151..115w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 151, Issue 1-2, p. 115-127.

Physics

2

Scientific paper

Data from the GRSN and SPICED array are used to investigate lower mantle structure beneath the North Atlantic Ocean just south of Nova Scotia. We study S waves in an attempt to determine whether a D′′ discontinuity can be observed in this region. The reflected phase SdS cannot be observed unambiguously, so we cross-correlate the traces with synthetic seismograms generated using a number of different 1D Earth models that incorporate positive and negative velocity discontinuities and gradients, as well as thin, high-velocity lamellae. The cross-correlation shows that a discontinuity with an S-wave velocity increase of magnitude 1 3% exists, which exhibits significant topography between 86 and 286 km above the CMB. The study area is located on the edge of a region of anomalously high seismic velocity identified by tomographic modelling, which fits with our observation of a high-velocity discontinuity.

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