We use a global data set of receiver functions to study the range of observations for the
region at the base of the mantle transition zone, around the 660 km discontinuity. A variety of …

Investigations into mechanisms driving surface tectonics commonly search for mantle
sources, but few observations constrain flow in the upper mantle and transition zone. Here …

Direct sampling of mantle rocks and minerals is limited to tectonic slices emplaced at the
surface (Chapter 3.4), smaller xenoliths transported upward by magmatic processes …

We use underside reflections of S wave seismic energy arriving as precursors to the seismic
phase SS to image the depth and impedance contrast present across mantle discontinuities …

Resolution of the pattern of large‐scale shear velocity variations above and below the
known and postulated mantle discontinuities could provide constraints on the nature of …

The upper mantle seismic discontinuities provide important constraints on models of mantle
composition and dynamics. New observations of re-flected and converted phases from the …

A variety of observations (Jeanloz 1995, Helffrich and Wood 1996, Irifune and Isshiki 1998,
Agee this volume) suggest that the upper mantle may be largely peridotitic in bulk …

Seismic tomography is a powerful tool for imaging the Earth's deep mantle structure. Despite
technical differences (ie, data treatment procedures, parametrization, and inversion method) …

We examine stacks of several seismic phases having different sensitivities to mantle
transition zone structure. When analyzed separately, underside P and S reflections (PdP …

SS and PP precursors are currently the only body wave data types that have significant
coverage in both oceanic and continental regions to study the existence and characteristics …