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Imaging mid-mantle discontinuities: implications for mantle chemistry, dynamics, rheology, and deep earthquakes
Using teleseismic network data and new signal processing techniques, I investigated mantle structure in the vicinity of subduction zones. The 660-km seismic discontinuity in the Izu-Bonin region is depressed by up to 80 km, indicative of material 1000$\sp\circ$K colder than ambient mantle. A broad depression of the discontinuity ...