Dictionary:Seismic discontinuity

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{{#category_index:S|seismic discontinuity}} 1. Any discontinuity in elastic properties and/or density where seismic velocity and/or acoustic impedance changes abruptly. 2. Specifically, the Moho discontinuity between the Earth’s crust and mantle, the Gutenberg discontinuity between the mantle and the core, and the gradational change between the outer and inner core.