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Effect of the tiger stripes on the deformation of Saturn's moon Enceladus
Author(s) -
Souček Ondřej,
Hron Jaroslav,
Běhounková Marie,
Čadek Ondřej
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069415
Subject(s) - enceladus , saturn , icy moon , tidal heating , geology , deformation (meteorology) , polar , astrobiology , libration (molecule) , shell (structure) , geophysics , physics , astronomy , planet , materials science , geometry , oceanography , point (geometry) , mathematics , composite material
Enceladus is a small icy moon of Saturn with active jets of water emanating from fractures around the south pole, informally called tiger stripes, which might be connected to a subsurface water ocean. The effect of these features on periodic tidal deformation of the moon has so far been neglected because of the difficulties associated with implementation of faults in continuum mechanics models. Here we estimate the maximum possible impact of the tiger stripes on tidal deformation and heat production within Enceladus's ice shell by representing them as narrow zones with negligible frictional and bulk resistance passing vertically through the whole ice shell. Assuming a uniform ice shell thickness of 25 km, consistent with the recent estimate of libration, we demonstrate that the faults can dramatically change the distribution of stress and strain in Enceladus's south polar region, leading to a significant increase of the heat production in this area.