Results 81 to 90 of about 2,132,735 (177)

Seismic Constraints on Temperature, Partial Melt, and Lithosphere‐Asthenosphere Dynamics in the Southwestern United States

Geochemistry, Geophysics, Geosystems
The southwestern United States hosts well‐documented and dramatic variations in topography, seismicity, heat flow, magmatism, and seismic velocity structure.
E. M. Golos, K. M. Fischer, Z. Eilon
doaj   +1 more source

A Magma Accretion Model for the Formation of Oceanic Lithosphere: Implications for Global Heat Loss

International Journal of Geophysics, 2010
A magma accretion model of oceanic lithosphere is proposed and its implications for understanding its thermal field examined. The new model (designated Variable Basal Accretion—VBA) assumes existence of lateral variations in magma accretion rates and ...
Valiya M. Hamza, Roberto R. Cardoso, Carlos H. Alexandrino   +2 more
doaj   +1 more source

Weak asthenosphere of Sumatran backarc revealed by long postseismic geodetic records

Communications Earth & Environment
The viscosity of Earth’s asthenosphere regulates plate motion and surface deformation. Assessing asthenosphere rheology in subduction-zone backarcs is as crucial as in forearc and arc regions for understanding subduction dynamics.
Grace Ng, Lujia Feng, Xin Zhou, Haipeng Luo, Kelin Wang, Tianhaozhe Sun, Chien Zheng Yong, Emma M. Hill   +7 more
doaj   +1 more source

Thermal properties of the crust and the lithosphere–asthenosphere boundary in the area of Poland from the heat flow variability and seismic data

International journal of earth sciences, 2019
High-resolution 3D seismic P-wave velocity model of Poland (Grad et al., Tectonophysics 666:188–210, 2016) and corrected for paleoclimate heat flow map (Majorowicz and Wybraniec, Int J Earth Sci 100(4):881–887, 2011) gridded to a common mesh are used ...
J. Majorowicz, M. Pólkowski, M. Grad
semanticscholar   +1 more source

Distribution of Bouguer gravity anomaly and crust and upper mantle in the Antarctic region

Antarctic Record, 1986
Bouguer gravity anomaly south of 45°S was derived from the newly provided data of free-air anomaly and topography, and its implications in the crust and upper mantle structure of the land and its marginal ocean area were discussed from the viewpoint of ...
Takeshi Matsumoto, Jiro Segawa, Katsutada Kaminuma   +2 more
doaj   +1 more source

Insights on Upper Mantle Melting, Rheology, and Anelastic Behavior From Seismic Shear Wave Tomography

Geochemistry, Geophysics, Geosystems, 2018
In seismic tomography we map the wave speed structure inside the Earth, but we ultimately seek to interpret those images in terms of physical parameters.
Laura Cobden, Jeannot Trampert, Andreas Fichtner   +2 more
doaj   +1 more source

Mantle Dynamics of the Long‐Lived Middle Yangtze Basaltic Field: Insight From a Combined Geochemical and Numerical Modeling Approach

Geochemistry, Geophysics, Geosystems
Melting for the generation of intracontinental diffuse basaltic fields is generally ascribed to the effects from lithospheric dynamic processes, but how the asthenospheric dynamics influence the overlying lithosphere remains poorly known.
Hong‐Kun Dai, Qing Xiong, Jian‐Ping Zheng   +2 more
doaj   +1 more source

Delamination Magmatism in Eastern Anatolia: A Geochemical Perspective

Geochemistry, Geophysics, Geosystems
The Sr‐Nd‐Hf‐Pb isotope geochemistry of the Late Miocene Tunceli Volcanics suggests that they are the products of mixed asthenospheric and lithospheric mantle melts.
Alican Aktağ, Kaan Sayit, Tanya Furman, Bradley J. Peters   +3 more
doaj   +1 more source

Lithospheric Structure Above the Northern Appalachian Anomaly: Initial Results From the NEST Array

Geophysical Research Letters
Seismic tomography observations show a low‐velocity feature in the upper mantle beneath eastern North America known as the Northern Appalachian Anomaly (NAA).
Kimberly Espinal, Maureen D. Long, Paul Karabinos, James R. Bourke   +3 more
doaj   +1 more source

Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku‐Oki earthquake

Geophysical Research Letters, 2016
Using two‐dimensional finite element modeling, we reproduced the observed postseismic deformation of the 2011 Tohoku‐Oki earthquake. Our model, which accounts for the lithosphere‐asthenosphere boundary and weak zones beneath volcanoes, was able to ...
Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai   +6 more
doaj   +1 more source