Mathematics – Logic
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..828k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 828-831.
Mathematics
Logic
41
Earth Mantle, P Waves, Propagation Velocity, Seismology, Anomalies, Japan
Scientific paper
In the course of the analysis of detailed three-dimensional P-wave velocity structure based on a tomographic inversion of 103,032 International Seismological Center travel time data, high-velocity anomalies were found in the lower mantle beneath the Japan Islands. Beneath the Sea of Japan, the high-velocity anomalies were found to be slablike and to extend below the deep-focus earthquakes of the high-velocity Pacific slab descending from the Japan trench. It is shown that the high-velocity lower-mantle anomalies are not seeping from those in the upper mantle. However, the depth extent of these anomalies could not be determined, because most of the ray paths in the high-velocity region have almost the same direction and the region extends along the ray paths. Two possibilities are suggested: (1) the fingering of the Pacific slab and (2) the heat conduction from cold slab in the upper mantle to the lower mantle without the penetration of the slab into the lower mantle.
Hirahara Kazuro
Kamiya Shin'ichiro
Miyatake Takashi
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