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

The Earth's transition zone has until recently been assumed to be seismically isotropic.
Increasingly, however, evidence suggests that ordering of material over seismic …

Advances in Deep-Seismic Sounding observations of the lithosphere on continents allow to
identify various scales of heterogeneities in the crust-mantle transition. In this paper a fresh …

Stacked images combining over 5 years of long‐period Global Digital Seismograph Network
data reveal many phases associated with reflections and conversions from upper mantle …

Seismic S-wave receiver functions (SRF) are a uniquely powerful tool for imaging velocity
discontinuities within the upper mantle. SRF data frequently contain negative phases at …

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 …

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

Seismic reflection profiles in USA and West Germany over thirty years ago showed strong
reflections from the lower crust but technical advances through the 1970s were needed for …

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 …

We estimate crustal and uppermost mantle shear velocity structure beneath 30 stations in
North America by jointly inverting the high frequency scattered wavefield observed in the P …