Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..745o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 745-748. Research supported by MOESC.
Other
4
Earth Mantle, Earthquakes, Propagation Velocity, Seismic Waves, Structural Properties (Geology), Subduction (Geology), P Waves, Plates (Tectonics)
Scientific paper
Travel time analyses are performed for the Kuril and the Mariana subduction zones to investigate whether a lower mantle high-velocity zone exists immediately beneath the deepest earthquakes in these regions. The corrected residuals for the deep Kuril events show that a high velocity zone extends in the down-dip direction of the Kuril slab in the lower mantle. On the other hand, the residuals for the deep Mariana events show no evidence for a high-velocity zone in the down-dip direction beneath the deepest earthquakes. A reasonable interpretation of these results is that the Kuril slab penetrates into the lower mantle (h is not less than 670 km) but that the Mariana slab does not extend vertically into the lower mantle.
Okano Kenta
Suetsugu Daisuke
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