The landward thinning of the low-velocity layer across the Kurile-Japan trench

Details The landward thinning of the low-velocity layer across the Kurile-Japan trench The landward thinning of the low-velocity layer across the Kurile-Japan trench

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..43..434u&link_type=abstract

Earth and Planetary Science Letters, Volume 43, Issue 3, p. 434-440.

Computer Science

Scientific paper

Composite P-wave seismograms are constructed for intermediate earthquakes in the Kurile region using seismic stations in central and western Japan. Ray paths are approximately parallel to the intermediate seismic zone along the Kurile-Japan arc. A compressional velocity structure model is constructed from the travel time and relative amplitude data for the upper mantle involving this intermediate seismic zone. The absence of any significant low-velocity layer below the descending slab of lithosphere can be shown from the data. Instead, the model consistent with the observed data has a non-velocity gradient layer of about 30 km thickness beneath the descending slab. The result suggests that the low-velocity layer beneath the Pacific plate thins landward across the Kurile-Japan trench and does not descend along the base of the descending slab.

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