A Shear Velocity Discontinuity in the Lower Mantle


A lower mantle S-wave triplication is detected using shortand long-period SH seismograms in the distance range 70 ø to 95 ø . Modeling of the observations with synthetic seismograms indicates that the tripliGation is produced by a 2.75 • 0.25% shear velocity increase about 280 km above the core-mantle boundary. The SH data from intermediate and deep focus… (More)


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