Advances in mapping lowermost mantle convective flow with seismic anisotropy observations
Convective flow in the deep mantle controls Earth's dynamic evolution, influences plate
tectonics, and has shaped Earth's current surface features. Present and past convection …
tectonics, and has shaped Earth's current surface features. Present and past convection …
Ultralow velocity zone and deep mantle flow beneath the Himalayas linked to subducted slab
The origins of ultralow velocity zones, small-scale structures with extremely low seismic
velocities found near the core–mantle boundary, remain poorly understood. One hypothesis …
velocities found near the core–mantle boundary, remain poorly understood. One hypothesis …
Low-velocity heterogeneities redistributed by subducted material in the deepest mantle beneath North America
The origins and composition of seismic low-velocity heterogeneities atop the core-mantle
boundary (CMB) remain poorly understood. It is also debated whether they are static …
boundary (CMB) remain poorly understood. It is also debated whether they are static …
Evidence for a Kilometer‐Scale Seismically Slow Layer Atop the Core‐Mantle Boundary From Normal Modes
Geodynamic modeling and seismic studies have highlighted the possibility that a thin layer
of low seismic velocities, potentially molten, may sit atop the core‐mantle boundary but has …
of low seismic velocities, potentially molten, may sit atop the core‐mantle boundary but has …
The emerging picture of a complex core-mantle boundary
Recent seismological studies challenge the traditional view that the interface between the
core and mantle is a straightforward discontinuity. As seismology is pushed to its …
core and mantle is a straightforward discontinuity. As seismology is pushed to its …
[HTML][HTML] Detection of a ULVZ in the Central Pacific using high frequency Sdiff postcursors
In recent decades, ultra-low velocity zones (ULVZs)–thin patches of strongly reduced
seismic velocity atop the core-mantle boundary (CMB)–have been inferred from …
seismic velocity atop the core-mantle boundary (CMB)–have been inferred from …
Flow and deformation in Earth's deepest mantle: Insights from geodynamic modeling and comparisons with seismic observations
The dynamics of Earth's D ″layer at the base of the mantle plays an essential role in Earth's
thermal and chemical evolution. Mantle convection in D ″is thought to result in seismic …
thermal and chemical evolution. Mantle convection in D ″is thought to result in seismic …
No globally detectable seismic interfaces within Earth's mantle transition zone: Evidence for basalt enrichment
Earth's mantle transition zone (MTZ) is characterized by multiple mineral phase changes.
The MTZ is bounded seismically by the 410-and 660-km elastic discontinuities, which are …
The MTZ is bounded seismically by the 410-and 660-km elastic discontinuities, which are …
The expression of mantle seismic anisotropy in the global seismic wavefield
The dependence of seismic wave speeds on propagation or polarization direction, called
seismic anisotropy, is a relatively direct indicator of mantle deformation and flow. Mantle …
seismic anisotropy, is a relatively direct indicator of mantle deformation and flow. Mantle …
ScS shear-wave splitting in the lowermost mantle: Practical challenges and new global measurements
Many regions of the Earth's mantle are seismically anisotropic, including portions of the
lowermost mantle, which may indicate deformation due to convective flow. The splitting of …
lowermost mantle, which may indicate deformation due to convective flow. The splitting of …