Advances in mapping lowermost mantle convective flow with seismic anisotropy observations

J Wolf, M Li, MD Long, E Garnero - Reviews of Geophysics, 2024 - Wiley Online Library
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 …

Ultralow velocity zone and deep mantle flow beneath the Himalayas linked to subducted slab

J Wolf, MD Long, DA Frost - Nature Geoscience, 2024 - nature.com
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 …

Low-velocity heterogeneities redistributed by subducted material in the deepest mantle beneath North America

J Wolf, M Li, MD Long - Earth and Planetary Science Letters, 2024 - Elsevier
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 …

Evidence for a Kilometer‐Scale Seismically Slow Layer Atop the Core‐Mantle Boundary From Normal Modes

S Russell, JCE Irving, L Jagt… - Geophysical Research …, 2023 - Wiley Online Library
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 …

The emerging picture of a complex core-mantle boundary

S Russell, JCE Irving, R Myhill, S Cottaar - nature communications, 2024 - nature.com
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 …

[HTML][HTML] Detection of a ULVZ in the Central Pacific using high frequency Sdiff postcursors

C Martin, S Russell, S Cottaar - Earth and Planetary Science Letters, 2024 - Elsevier
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 …

Flow and deformation in Earth's deepest mantle: Insights from geodynamic modeling and comparisons with seismic observations

M Li, J Wolf, E Garnero, MD Long - Journal of Geophysical …, 2024 - Wiley Online Library
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 …

No globally detectable seismic interfaces within Earth's mantle transition zone: Evidence for basalt enrichment

WD Frazer, J Park - Earth and Planetary Science Letters, 2024 - Elsevier
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 expression of mantle seismic anisotropy in the global seismic wavefield

J Wolf, MD Long, DA Frost… - Geophysical Journal …, 2024 - academic.oup.com
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 …

ScS shear-wave splitting in the lowermost mantle: Practical challenges and new global measurements

J Wolf, MD Long - Seismica, 2024 - seismica.library.mcgill.ca
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 …