Detection of a ULVZ at the base of the mantle beneath the northwest Pacific

Details Detection of a ULVZ at the base of the mantle beneath the northwest Pacific Detection of a ULVZ at the base of the mantle beneath the northwest Pacific

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3617301x&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 17, CiteID L17301

Physics

3

Seismology: Mantle (1212, 1213, 8124), Seismology: Body Waves, Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Planetary Interiors (5430, 5724, 6024)

Scientific paper

We used the Yellowknife seismic array (YKA) to measure the slowness of 1,371 P and P diff waves from earthquakes occurring in the circum-Pacific region. The corresponding anomalies in P-velocity show a sharp reduction of up to 6% across a patch of the lowermost mantle beneath the Northwest Pacific with lateral dimensions of several hundred kilometers. The location of this ultra low velocity zone (ULVZ) correlates with a long-wavelength compositional boundary revealed by probabilistic mantle tomography. We interpret the ULVZ as partial melt created by paleo-slab material that is being swept laterally from northwestern Pacific subduction zones towards the large, chemically distinct province beneath the south-central Pacific.

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