Upper mantle velocity structure estimated from PS-converted wave beneath the north-eastern Japan Arc

Details Upper mantle velocity structure estimated from PS-converted wave beneath the north-eastern Japan Arc Upper mantle velocity structure estimated from PS-converted wave beneath the north-eastern Japan Arc

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986geoj...86..767m&link_type=abstract

Geophysical Journal (ISSN 0016-8009), vol. 86, Sept. 1986, p. 767-787.

Physics

90

Earth Mantle, Earth Planetary Structure, Ocean Bottom, Propagation Velocity, S Waves, Wave Propagation, Japan, Vertical Distribution

Scientific paper

The upper boundary of the descending oceanic plate is located by using PS-waves (converted from P to S at the boundary) in the Tohoku District, the north-eastern part of Honshu, Japan. The observed PS-P time data are well explained by a two-layered oceanic plate model composed on a thin low-velocity upper layer whose thickness is less than 10 km and a thick high-velocity lower layer; the upper and lower layers respectively have 6 percent lower and 6 percent higher velocity than the overriding mantle. The estimated location of the uppper boundary is just above the upper seismic plane of the double-planed deep seismic zone. This result indicates that events in the upper seismic plane, at least in the depth range from 60 to 150 km, occur within the thin low-velocity layer on the surface of the oceanic plate.

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