Upper mantle anelasticity and its time dependence resolved by GPS in 3-D ocean tide loading displacements
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508356" target="_blank" >RIV/00216208:11320/25:10508356 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UM_V2RrgZo" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UM_V2RrgZo</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.epsl.2025.119644" target="_blank" >10.1016/j.epsl.2025.119644</a>
Alternative languages
Result language
angličtina
Original language name
Upper mantle anelasticity and its time dependence resolved by GPS in 3-D ocean tide loading displacements
Original language description
Ocean tide loading (OTL) refers to the Earth's deformational response to periodic ocean mass redistributions driven by astronomical tides. This transient deformation likely involves anelasticity, which is associated with energy dissipation and plays a crucial role in understanding Earth's deformation across various temporal scales. However, anelastic contributions to OTL are minor (submillimetre-to-millimetre scale) relative to elastic OTL deformation and are comparable in magnitude to the influence of lateral heterogeneities in crust and upper mantle elasticity. Because of this, detecting and isolating anelastic OTL deformation remains challenging. Here, by analysing high-accuracy (0.2-0.4 mm) Global Positioning System (GPS) data from 255 sites across western Europe, and comparing with OTL forward modelling results from advanced 3-D elastic and anelastic Earth models incorporating sediments, we unambiguously demonstrate anelastic OTL displacements, in both horizontal and vertical directions. Our findings highlight the necessity of incorporating anelasticity into geodynamic models, particularly for processes operating at sub-seismic frequencies, and into a unifying viscoelastic law for modelling Earth deformations across multiple timescales. Furthermore, using GPS observations and realistic 3-D models, we constrain anelastic parameters for Earth's upper mantle. These parameters reveal the weakening or dispersion of upper-mantle shear modulus, by up to 20 % at semi-diurnal tidal frequencies compared to its 1 Hz value in the Preliminary Reference Earth Model (PREM), and constrain the time dependence of this weakening. Our results support the application of OTL observations for constraining Earth's anelasticity in the sub-seismic frequency range.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10500 - Earth and related environmental sciences
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Earth and Planetary Science Letters
ISSN
0012-821X
e-ISSN
1385-013X
Volume of the periodical
671
Issue of the periodical within the volume
September
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
12
Pages from-to
119644
UT code for WoS article
001584425200001
EID of the result in the Scopus database
2-s2.0-105016882308