A 22° long seismic profile for the study of the top of D''

Details A 22° long seismic profile for the study of the top of D'' A 22° long seismic profile for the study of the top of D''

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3409f&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 22, p. 3409-3412

Physics

Geophysics

5

Marine Geology And Geophysics: Instruments And Techniques, Seismology, Seismology: Surface Waves And Free Oscillations, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes

Scientific paper

We present a collection of 100 vertical component seismograms of a Kuril Islands earthquake recorded by stations in western Europe (between 73 and 95° of epicentral distance) which shows evidence of a PdP wave reflected on top of D'' beneath northern Siberia. The PdP travel time curve varies rapidly, suggesting the existence of sharp lateral variations (scale length smaller than 1°). The first onset times observed at distances larger than 85° are compatible with a D'' velocity about 1% larger than standard models along these paths, up to a depth of 2850 km. By one dimensional forward modeling we find one model with a 2.8% discontinuity at 2605 km depth, another with a 7 km thick 3% low velocity lamella at 2607 km depth. They both generate waveforms which fit the data similarly.

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