Superionic iron hydride shapes ultralow-velocity zones at Earth's core–mantle boundary

Y Zhang, W Wang, Y Li, Z Wu - Proceedings of the National Academy of …, 2024 - pnas.org
Seismological studies have exposed numerous ultralow velocity zones (ULVZs) exhibiting
extraordinary physical attributes at Earth's core–mantle boundary, yet their compositions and …

Extensive iron–water exchange at Earth's core–mantle boundary can explain seismic anomalies

K Kawano, M Nishi, H Kuwahara, S Kakizawa… - Nature …, 2024 - nature.com
Seismological observations indicate the presence of chemical heterogeneities at the
lowermost mantle, just above the core–mantle boundary (CMB), sparking debate over their …

Subslab ultra low velocity anomaly uncovered by and facilitating the largest deep earthquake

W Chen, S Wei, W Wang - Nature Communications, 2024 - nature.com
It is enigmatic that M8+ earthquakes can take place at depth greater than 600 km inside the
slab, where the PT conditions generally do not favor seismic slip rate (~ m/s) on faults. Here …

[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 …

[HTML][HTML] The spatio-temporal evolution of 182W and 142Nd in the Deccan-La Réunion plume

JJ Pakulla, J Tusch, E Hasenstab-Dübeler… - Earth and Planetary …, 2025 - Elsevier
Variations of the short-lived decay products 182 W and 142 Nd that formed approximately
during the first 60 and 500 million years after solar system formation are pivotal in our …

Ultra‐low velocity zones beneath the Southern Hemisphere imaged with double‐array stacking of PcP waveforms

KJ Agboola, SE Hansen, EJ Garnero… - Journal of …, 2024 - Wiley Online Library
Ultra‐low velocity zones (ULVZs) are anomalous structures, generally associated with
decreased seismic velocity and sometimes an increase in density, that have been detected …

Thermoelastic Properties of Seifertite at High Pressures and Temperatures: Implications for Negative Velocity Discontinuities in the D" Layer

T Liu, X Wang, C Pu, Z **g - Geophysical Research Letters, 2024 - Wiley Online Library
Negative velocity discontinuities are often observed at the base of the D''layer, yet their
formation mechanisms remain elusive. Here, we present the first investigation of …

Contribution of tangential CMB-mantle flow between hot mantle plumes and cold downwellings to ULVZ formation and morphology

J **n, H Zhang, Y Shi, F Orellana-Rovirosa… - Authorea …, 2024 - essopenarchive.org
Ultra-low velocity zones (ULVZs) above the core-mantle boundary (CMB) are observed
structures that may be related to the liquid outer-core. As” thin patches” of dramatically low …