Tidal Walking on Europa's Strike-Slip Faults-Insight From Numerical Modeling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421095" target="_blank" >RIV/00216208:11320/20:10421095 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=TRFpKaYYig" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=TRFpKaYYig</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2019JE006327" target="_blank" >10.1029/2019JE006327</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tidal Walking on Europa's Strike-Slip Faults-Insight From Numerical Modeling

Popis výsledku v původním jazyce

Tidal walking has been proposed as a mechanism inducing lateral offset on preexisting strike-slip faults on Europa by tidal forcing. We test this hypothesis numerically by modeling a part of Europa&apos;s ice shell with an embedded strike-slip fault. Our model involves two coupled processes: (i) slip at the fault and deformation of the ice shell on the tidal timescale and (ii) thermal evolution of the ice shell on the timescale of tens of thousands of years. The fault is characterized by the Mohr-Coulomb criterion allowing to determine self-consistently the activation depth of the fault. On the tidal timescale, the ice shell is described by the Maxwell viscoelasticity; on the convection timescale, the ice is treated as a non-Newtonian viscous fluid. We show that tidal walking is capable of producing surface lateral offset of the order of kilometers over 100 thousand years provided that the active part of the fault penetrates the high-viscosity part of the shell. Such conditions are likely not met for the current amplitude of the tidal forcing and for the estimated ice shell thickness. We show that either larger forcing amplitude (e.g., due to higher eccentricity of the moon) or partial flooding of the fault zone by water from the ocean is required to produce the observed offset. We demonstrate that thermo-mechanical coupling can significantly enhance the efficiency of tidal walking and we investigate conditions for which the fault&apos;s activity can result in observable surface thermal signatures.

Název v anglickém jazyce

Tidal Walking on Europa's Strike-Slip Faults-Insight From Numerical Modeling

Popis výsledku anglicky

Tidal walking has been proposed as a mechanism inducing lateral offset on preexisting strike-slip faults on Europa by tidal forcing. We test this hypothesis numerically by modeling a part of Europa&apos;s ice shell with an embedded strike-slip fault. Our model involves two coupled processes: (i) slip at the fault and deformation of the ice shell on the tidal timescale and (ii) thermal evolution of the ice shell on the timescale of tens of thousands of years. The fault is characterized by the Mohr-Coulomb criterion allowing to determine self-consistently the activation depth of the fault. On the tidal timescale, the ice shell is described by the Maxwell viscoelasticity; on the convection timescale, the ice is treated as a non-Newtonian viscous fluid. We show that tidal walking is capable of producing surface lateral offset of the order of kilometers over 100 thousand years provided that the active part of the fault penetrates the high-viscosity part of the shell. Such conditions are likely not met for the current amplitude of the tidal forcing and for the estimated ice shell thickness. We show that either larger forcing amplitude (e.g., due to higher eccentricity of the moon) or partial flooding of the fault zone by water from the ocean is required to produce the observed offset. We demonstrate that thermo-mechanical coupling can significantly enhance the efficiency of tidal walking and we investigate conditions for which the fault&apos;s activity can result in observable surface thermal signatures.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

<a href="/cs/project/GA19-10809S" target="_blank" >GA19-10809S: Termomechanické procesy v ledových měsících z pohledu numerického modelování</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research: Planets

ISSN

2169-9097

e-ISSN

—

Svazek periodika

125

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

24

Strana od-do

e2019JE006327

Kód UT WoS článku

000566216900029

EID výsledku v databázi Scopus

2-s2.0-85089833820