Physics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1091o&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 7, p. 1091-1094
Physics
5
Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Earth'S Interior-Composition And State, Tectonophysics: Tomography
Scientific paper
Tomographic images of the mantle west of Japan and south Kuril islands suggest that in this region the subducted lithospheric slabs instead of penetrating the lower mantle, lie flat on top of it [van der Hilst et al., 1991; Fukao et al., 1992]. To test these models with independent data and techniques, we analyse the slowness of the P arrivals of Kuril-Japan seismic events at a seismic network in Baikal region. Relative to IASP91 standard earth model, the flat lying slab should generate an additional refraction line at epicentral distances less than 30°. The presence of this line is very clear in our data. The slope of the line and its position relative to the other lines are qualitatively consistent with the estimates of the slab velocity and thickness in the tomographic models. However, a similar wavefield can be generated by 530 km discontinuity, the presence of which is established by long-range refraction profiling in the neighboring regions of northern Eurasia.
Kind Rainer
Oreshin Serge
Treussov Alexandr
Vinnik Lev
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