Results 21 to 30 of about 31,006 (289)

Seismic Anisotropy in Subduction Zones: Evaluating the Role of Chloritoid

open access: yesFrontiers in Earth Science, 2021
Subduction zones are often characterized by the presence of strong trench-parallel seismic anisotropy and large delay times. Hydrous minerals, owing to their large elastic anisotropy and strong lattice preferred orientations (LPOs), are often invoked to ...
Jungjin Lee   +4 more
doaj   +1 more source

Global Compilation of Deep Mantle Anisotropy Observations and Possible Correlation With Low Velocity Provinces

open access: yesGeochemistry, Geophysics, Geosystems, 2023
We compile and make publicly available a global digital database of body wave observations of seismic anisotropy in the D′′ layer, grouped using the method used to analyze deep mantle anisotropy. Using this database, we examine the global distribution of
Jonathan Wolf   +3 more
doaj   +1 more source

Seismic wave propagation in anisotropic ice – Part 1: Elasticity tensor and derived quantities from ice-core properties [PDF]

open access: yesThe Cryosphere, 2015
A preferred orientation of the anisotropic ice crystals influences the viscosity of the ice bulk and the dynamic behaviour of glaciers and ice sheets. Knowledge about the distribution of crystal anisotropy is mainly provided by crystal orientation fabric
A. Diez, O. Eisen
doaj   +1 more source

Upper mantle anisotropy from shear wave splitting of teleseismic earthquakes in the Kumaun-Garhwal and adjoining area of NW Himalaya

open access: yesJournal of Asian Earth Sciences: X, 2021
Teleseismic earthquakes data recorded by 8 broadband digital seismic stations deployed in the Kumaun-Garhwal and adjoining area of NW Himalaya are analyzed to investigate the seismic anisotropy in the upper mantle. Shear-wave splitting parameters (ɸ and ∂
Narendra Kumar   +4 more
doaj   +1 more source

Multiscale model of global inner-core anisotropy induced by hcp-alloy plasticity [PDF]

open access: yes, 2016
$\bullet$ Multiscale model of inner-core anisotropy produced by hcp alloy deformation$\bullet$ 5 to 20% single-crystal elastic anisotropy and plastic deformation by pyramidal slip $\bullet$ Low-degree inner-core formation model with faster ...
Cardin, Ph   +3 more
core   +4 more sources

Seismic anisotropy of Opalinus Clay: tomographic investigations using the infrastructure of an underground rock laboratory (URL)

open access: yesSwiss Journal of Geosciences, 2021
Seismic anisotropy and attenuation make claystone formations difficult to characterize. On the other hand, in many geotechnical environments, precise knowledge of structure and elastic properties of clay formations is needed. In crystalline and rock salt
Roman Esefelder   +4 more
doaj   +1 more source

Effects of Background Porosity on Seismic Anisotropy in Fractured Rocks: An Experimental Study

open access: yesApplied Sciences, 2023
Fractures are widely distributed in the subsurface and are crucial for hydrocarbon, CCS, offshore infrastructure (windfarms), and geothermal seismic surveys.
Yuangui Zhang   +3 more
doaj   +1 more source

Mantle-flow diversion beneath the Iranian plateau induced by Zagros’ lithospheric keel

open access: yesScientific Reports, 2021
Previous investigation of seismic anisotropy indicates the presence of a simple mantle flow regime beneath the Turkish-Anatolian Plateau and Arabian Plate.
Ayoub Kaviani   +8 more
doaj   +1 more source

The anisotropy of hexagonal close-packed iron under inner core conditions: the effect of light elements

open access: yesEarth and Planetary Physics, 2022
In recent decades, global seismic observations have identified increasingly complex anisotropy of the Earth’s inner core. Numerous seismic studies have confirmed hemispherical variations in the inner core’s anisotropy.
Wei Zhang, Mei Tang, ZhenWei Niu
doaj   +1 more source

Finite-Frequency SKS Splitting: Measurement and Sensitivity Kernels [PDF]

open access: yes, 2008
Splitting of SKS waves caused by anisotropy may be analyzed by measuring the splitting intensity, i.e., the amplitude of the transverse signal relative to the radial signal in the SKS time window. This quantity is simply related to structural parameters.
Paulssen, Hanneke   +3 more
core   +1 more source

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