期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 151, 期 1-2, 页码 115-127出版社
ELSEVIER
DOI: 10.1016/j.pepi.2005.02.001
关键词
D '' structure; S-waves; synthetic seismograms; lower mantle
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-II discontinuity can be observed in this region. The reflected phase SdS cannot be observed unambiguously, so we cross-correlate the traces with synthetic seismograrns 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. (c) 2005 Elsevier B.V. All rights reserved.
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