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\begin{document}

\title{Dynamic component of the asthenosphere: lateral viscosity variations due
to dislocation creep at the base of oceanic plates}



\author[1]{Vojtech Patocka}%
\author[2]{Hana Cizkova}%
\author[1]{Jakub Pokorny}%
\affil[1]{Charles University}%
\affil[2]{Charles University, Faculty of Mathematics and Physics}%


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  \date{May 18, 2024}


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\begin{abstract}
The asthenosphere is commonly defined as an upper mantle zone with low
velocities and high attenuation of seismic waves, and high electrical
conductivity. These observations are usually explained by the presence
of partial melt, or by a sharp contrasts in the water content of the
upper mantle. Low viscosity asthenosphere is an essential ingredient of
functioning plate tectonics. We argue that a substantial component of
asthenospheric weakening is dynamic, caused by dislocation creep at the
base of tectonic plates. Numerical simulations of subduction show that
dynamic weakening scales with the surface velocity both below the
subducting and the overriding plate, and that the viscosity decrease
reaches up to two orders of magnitude. The resulting scaling law is
employed in an apriori estimate of the lateral viscosity variations
(LVV) below Earth's oceans. The obtained LVV helps in explaining some of
the long-standing as well as recent problems in mantle viscosity
inversions.%
\end{abstract}%



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