Physics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996georl..23..399k&link_type=abstract
Geophysical Research Letters, Volume 23, Issue 4, p. 399-402
Physics
34
Seismology: Core And Mantle, Seismology: Continental Crust, Tectonophysics: Dynamics Of Lithosphere And Mantle-General
Scientific paper
Broad-band data from the Canadian National Seismograph Network (CNSN) shows evidence for a laterally-varying S-wave discontinuity in the lowermost mantle beneath the Caribbean. The magnitude of the velocity contrast across this D'' discontinuity varies inversely with its distance from the core-mantle boundary (CMB). Clear evidence for a 2.75% increase in shear velocity 250 km above the CMB is observed in a region 10°N and 60-85°W a thicker D'' layer (290 km) with a less pronounced topside discontinuity (2.45%) is interpreted in the region 80°-90°W and 20°N and there is no evidence for a D'' discontinuity in the region 65°-80°W and 25°N. Considerable 3D structure within the D'' region is suggested by travel-time scatter in ScS arrivals and S arrivals which turn within D''. Transverse-component SKS signals due to upper-mantle anisotropy can be confused with D'' signals; however, we show that false interpretations of D'' structure can be mitigated through the careful analysis of travel-time moveout and low-pass filtering.
Kendall J.-Michael
Nangini C.
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