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 …

Detections of ultralow velocity zones in high-velocity lowermost mantle linked to subducted slabs

Y Su, S Ni, B Zhang, Y Chen, W Wu, M Li, H Sun… - Nature …, 2024 - nature.com
Ultralow velocity zones revealed by seismological observations at the core–mantle
boundary lend clues to the physico-chemical characteristics and dynamic evolution of the …

Up-to-fivefold reverberating waves through the Earth's center and distinctly anisotropic innermost inner core

TS Phạm, H Tkalčić - Nature Communications, 2023 - nature.com
Probing the Earth's center is critical for understanding planetary formation and evolution.
However, geophysical inferences have been challenging due to the lack of seismological …

Observations of mantle seismic anisotropy using array techniques: Shear‐wave splitting of beamformed SmKS phases

J Wolf, DA Frost, MD Long, E Garnero… - Journal of …, 2023 - Wiley Online Library
Shear‐wave splitting measurements are commonly used to resolve seismic anisotropy in
both the upper and lowermost mantle. Typically, such techniques are applied to SmKS …

Dynamic history of the inner core constrained by seismic anisotropy

DA Frost, M Lasbleis, B Chandler, B Romanowicz - Nature Geoscience, 2021 - nature.com
Progressive crystallization of Earth's inner core drives convection in the outer core and
magnetic field generation. Determining the rate and pattern of inner-core growth is thus …

Superionic effect and anisotropic texture in Earth's inner core driven by geomagnetic field

S Sun, Y He, J Yang, Y Lin, J Li, DY Kim, H Li… - Nature …, 2023 - nature.com
Seismological observations suggest that Earth's inner core (IC) is heterogeneous and
anisotropic. Increasing seismological observations make the understanding of the …

Heterogeneous mantle effects on the behaviour of SmKS waves and outermost core imaging

DA Frost, EJ Garnero, N Creasy, J Wolf… - Geophysical Journal …, 2024 - academic.oup.com
Seismic traveltime anomalies of waves that traverse the uppermost 100–200 km of the outer
core have been interpreted as evidence of reduced seismic velocities (relative to radial …

Seismic low-velocity equatorial torus in the Earth's outer core: Evidence from the late–coda correlation wavefield

X Ma, H Tkalčić - Science Advances, 2024 - science.org
Thermochemical inhomogeneities in the Earth's outer core that enhance our understanding
of the geodynamo have been elusive. Seismic constraints on such inhomogeneities would …

Evidence for the innermost inner core: robust parameter search for radially varying anisotropy using the neighborhood algorithm

J Stephenson, H Tkalčić… - Journal of Geophysical …, 2021 - Wiley Online Library
The model of cylindrical anisotropy in the inner core (IC) states that seismic rays traveling
parallel to the Earth's rotational axis travel faster than those parallel to the equator. There …

Origin of temporal changes of inner-core seismic waves

Y Yang, X Song - Earth and Planetary Science Letters, 2020 - Elsevier
Temporal changes of inner-core (IC) seismic phases have been confirmed with high-quality
waveform doublets. However, the nature of the temporal changes is still controversial. We …