Grain Boundary Diffusion of Ferropericlase: Implications for the Core‐Mantle Interaction
Geophysical Research LettersGeophysical observations indicate that iron enrichment of various spatial scales may be present in the lowermost mantle. Various mechanisms have been proposed to explain the process of iron infiltration from the core to the mantle, each with its own ...
Yihang Peng +3 more
doaj +2 more sources
Detection of Lowermost Mantle Heterogeneity Using Seismic Migration of Diffracted S‐Waves
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.Abstract The bottom of Earth's mantle hosts strong seismic wave speed heterogeneities. These are commonly detected via forward modeling of seismic waveforms, which can include time‐consuming waveform synthesis and visual inspection. Furthermore, such imaging has been most commonly carried out with waves that have limited global coverage.
Jonathan Wolf +6 more
wiley +2 more sources
Ultra‐Low Velocity Zone Beneath the Atlantic Near St. Helena
Geochemistry, Geophysics, GeosystemsThere are various hotspots in the Atlantic Ocean, which are underlain by mantle plumes that likely cross the mantle and originate at the core‐mantle boundary. We use teleseismic core‐diffracted shear waves to look for an Ultra‐Low Velocity Zone (ULVZ) at
Sefira Davison +3 more
doaj +2 more sources
Mapping structures on the core–mantle boundary using Sdiff postcursors: Part I. Method and Validation [PDF]
, 2023 SUMMARY Ultra-low velocity zones (ULVZs) are patches of extremely slow seismic velocities on the core–mantle boundary (CMB). Here, we target them using the postcursors to S core-diffracted phases (Sdiff) caused by ULVZs.
Carl Martin +5 more
core +3 more sources
Seismic and mineralogical evidence for an iron-rich mega-ultralow-velocity zone beneath Hawai'i. [PDF]
Sci AdvMantle plumes beneath major oceanic hotspots appear to be rooted in unusually large structures near the core-mantle boundary, which have dramatically reduced seismic wave speeds.
Kim D +3 more
europepmc +3 more sources
Improved characterization of ultralow‐velocity zones through advances in Bayesian inversion of ScP waveforms [PDF]
, 2023 Ultralow-velocity zones (ULVZs) have been studied using a variety of seismic phases; however, their physical origin is still poorly understood. Short period ScP waveforms are extensively used to infer ULVZ properties because they may be sensitive to all ...
Rost, S, Pachhai, S, Thorne, MS
core +1 more source
Data set for the Hawaiian ULVZ
, 2021 This data set is published for the manuscript, "Kilometer-scale structure on the core-mantle boundary at the source of the Hawaiian mantle plume". It includes the synthetics and the real data of Hawaiia ULVZ that used in the analysis of this study.
Jenkins, Jennifer +3 more
core +1 more source
Kilometer-scale structure on the core-mantle boundary at the source of the Hawaiian mantle plume [PDF]
, 2022 The lowermost mantle right above the core-mantle boundary shows a complex and heterogeneous landscape containing multiple poorly understood seismic features visible across a wide range of length scales. The smallest, but most extreme, heterogeneities yet
core +5 more sources
An unsually large ULVZ at the base of the mantle near Hawaii
, 2012 Previous studies have documented the presence of ultra-low-velocity-zones (ULVZs) at the base of the mantle, through observations of body wave complexities.
Romanowicz, Barbara, Cottaar, Sanne
core +2 more sources
, 2021 <p>We analyzed 4,754 broadband seismic recordings of the SKS, SKKS, and SPdKS wavefield from 13 high quality events sampling the Samoa ultralow-velocity zone (ULVZ).
Leng, Kuangdai +3 more
core +1 more source