Article
Geochemistry & Geophysics
N. Bulut, H. Thybo, V Maupin
Summary: This study presents a P-wave velocity model of the upper mantle in Fennoscandia obtained from finite-frequency body-wave tomography. The model reveals a strong negative velocity anomaly in Norway, which may provide isostatic support to the high topography of the Scandinavian mountain range. Additionally, strong positive velocity anomalies are observed around the southern Bothnian Bay and the Baltic Sea.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Omid Bagherpur Mojaver, Fiona Darbyshire, Riddhi Dave
Summary: The study reveals significant variations in seismic velocities across different tectonic zones, with no simple relation found between lithospheric thicknesses and ages. The lithosphere-asthenosphere boundary in the study area is located at depths of 70-120 km, with the thickest and fastest lithosphere beneath New Brunswick.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Xin Liu, Dapeng Zhao
Summary: By using a new method of jointly inverting seismic data, a new 3-D shear wave velocity (V-s) model beneath the Cape Verde hotspot down to 400 km depth has been determined, revealing two V-s discontinuities at depths of around 15 and 60 km beneath volcanic islands. High-V-s anomalies in the uppermost mantle beneath the Atlantic Ocean and low-V-s anomalies beneath volcanic islands suggest a plume-modified lithosphere-asthenosphere system beneath the hotspot.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Chaoqiang Chen, Lijuan He, Yanxia Fan, Liwen Yan, Jinhui Wu
Summary: Cratons are important components in the evolution of Earth, with some being stable while others lose stability. There is a discrepancy in thickness between the thermal and seismic lithosphere, with the seismic lithosphere generally thicker. The thicker the lithosphere, the higher the stability of the cratons.
Article
Geosciences, Multidisciplinary
Hwaju Lee, Younghee Kim, Maximiliano J. Bezada, Robert W. Clayton
Summary: This study compares the subduction of two ridges on the Nazca Plate and concludes that subslab mantle buoyancy has a larger impact on the subduction angle than the crustal material of the ridge.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Fenitra Andriampenomanana, Andrew A. Nyblade, Michael E. Wysession, Raymond J. Durrheim, Frederik Tilmann, Guilhem Barruol, Gerard Rambolamanana, Tsiriandrimanana Rakotondraibe
Summary: The lithosphere of Madagascar has undergone a long series of tectonic processes, from the Pan-African Orogeny to extensional tectonic and magmatic events. Studies show complex lateral variations in seismic velocity and anisotropy within the uppermost mantle, reflecting the tectonic history and thermal perturbations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geology
J. M. Kendall, D. Schlaphorst, C. A. Rychert, N. Harmon, M. Agius, S. Tharimena
Summary: Parallel melt accumulation along the Mid-Atlantic Ridge was found, and this may enhance the driving forces of the plates.
Article
Geochemistry & Geophysics
Ruo Jia, Dapeng Zhao, Jianping Wu
Summary: A robust 3-D imaging of the crust and upper mantle beneath NE China was achieved using seismic data. Various seismic anisotropy characteristics were observed at different depths and regions, reflecting the influence of geological structures and plate movements. Additionally, unique geological structures associated with volcanic activities were identified.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
P. Moulik, V Lekic, B. Romanowicz, Z. Ma, A. Schaeffer, T. Ho, E. Beucler, E. Debayle, A. Deuss, S. Durand, G. Ekstrom, S. Lebedev, G. Masters, K. Priestley, J. Ritsema, K. Sigloch, J. Trampert, A. M. Dziewonski
Summary: Global variations in the propagation of surface waves provide unique constraints on the source properties and structure of the Earth's mantle. This study aims to construct a reference data set of multimode dispersion measurements by reconciling large and diverse catalogues of surface wave dispersion. The study finds that the measurements of fundamental-mode dispersion are internally consistent, but the agreement deteriorates for overtones.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Laura Petrescu, Felix Borleanu, Emanuel Kaestle, Randell Stephenson, Anica Placinta, Oleksandr Ivanovich Liashchuk
Summary: This study investigates the seismic structure of the Eastern European lithosphere and the transition from Precambrian to Phanerozoic Europe. The results show that the crust thickens across the Trans European Suture Zone boundary and the mantle is seismically faster beneath younger terranes. The Precambrian building blocks exhibit contrasting seismic fabrics, with the Baltic orogens characterized by uniform crust and the Sarmatia region showing alternating high and low velocity layers.
Article
Geochemistry & Geophysics
A. Christian Stanciu, Eugene D. Humphreys
Summary: New P and S teleseismic tomography models of the upper mantle beneath California and Nevada have been presented, showing stronger and narrower structures beneath prominent tectonic features in the region. These structures suggest the presence of partial melting in the upper mantle and imply variations in the upper mantle that ultimately impact the overlying crust in California and Nevada. The incorporation of modern crustal velocity models and technical advancements in tomographic methods have improved image resolution and seismic structure definition.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Pengxiang Zhou, Sebastien Chevrot, Maximilien Lehujeur, Shaohong Xia, Chunquan Yu
Summary: Eikonal tomography, using a new smoothing spline approach, is applied to study 40 large teleseismic events recorded by the CEArray. Precise phase measurements are used to determine phase velocities, and a 3-D shear wave velocity model is obtained through inversion. The results reveal lithospheric structures that correlate with surface geology and tectonic provinces, providing important insights.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Omid Bagherpur Mojaver, Fiona Darbyshire
Summary: Terranes in southeastern Canada and northeastern USA have experienced tectonization since the Archean, making it a valuable region to study the evolution of continental crust. Using noise data and tomography, we found that the crust in this area exhibits anisotropy, with some localized changes, and observed a Moho-offset feature. Our results provide important evidence for the tectonic evolution in the study area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
J-P Montagner, G. Burgos, Y. Capdeville, E. Beucler, A. Mocquet
Summary: The mantle transition zone, located between 410 and 1000 km in depth, plays a crucial role in mantle convection processes by acting as a boundary layer within the mantle. Depth variations of seismic anisotropies allow for the detection of boundary layers within the mantle. A new 3D anisotropy model of the mantle down to 1200 km in depth has been developed, revealing significant seismic anisotropy below subduction zones around the Pacific Ocean and in a large area beneath eastern Eurasia.
Article
Geochemistry & Geophysics
Haruka Nagai, Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
Summary: This article presents a method for inverting the seismic structures of the oceanic lithosphere-asthenosphere system, which is crucial for understanding plate tectonics. By combining envelope-fitting and waveform inversion techniques, the study successfully obtained a continuous structure model from the crust to the asthenosphere, improving the resolution in the asthenosphere.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Aubreya N. Adams, Douglas A. Wiens, Andrew A. Nyblade, Garrett G. Euler, Patrick J. Shore, Rigobert Tibi
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2015)
Article
Geochemistry & Geophysics
Jordan H. Graw, Aubreya N. Adams, Samantha E. Hansen, Douglas A. Wiens, Lauren Hackworth, Yongcheol Park
EARTH AND PLANETARY SCIENCE LETTERS
(2016)
Article
Geochemistry & Geophysics
Aubreya Adams, Richard Brazier, Andrew Nyblade, Arthur Rodgers, Abdullah Al-Amri
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2009)
Article
Geochemistry & Geophysics
Aubreya Adams, Andrew Nyblade, Dayanthie Weeraratne
GEOPHYSICAL JOURNAL INTERNATIONAL
(2012)
Article
Geochemistry & Geophysics
J. P. O'Donnell, A. Adams, A. A. Nyblade, G. D. Mulibo, F. Tugume
GEOPHYSICAL JOURNAL INTERNATIONAL
(2013)
Article
Geochemistry & Geophysics
A. Adams, J. Miller, N. Accardo
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2018)
Article
Geochemistry & Geophysics
Grace Barcheck, Geoffrey A. Abers, Aubreya N. Adams, Anne Becel, John Collins, James B. Gaherty, Peter J. Haeussler, Zongshan Li, Ginevra Moore, Evans Onyango, Emily Roland, Daniel E. Sampson, Susan Y. Schwartz, Anne F. Sheehan, Donna J. Shillington, Patrick J. Shore, Spahr Webb, Douglas A. Wiens, Lindsay L. Worthington
SEISMOLOGICAL RESEARCH LETTERS
(2020)
Review
Geosciences, Multidisciplinary
Aubreya Adams
Summary: The Cameroon Volcanic Line (CVL) of west Africa, which exhibits asynchronous volcanism along the line, poses challenges to common models of mantle processes and volcanic system genesis. Geophysical studies have been conducted to understand the complex geology of the region and potential geodynamic models for the CVL formation.
FRONTIERS IN EARTH SCIENCE
(2022)