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Title:
True polar wander on Europa from global-scale small-circle depressions
Authors:
Schenk, Paul; Matsuyama, Isamu; Nimmo, Francis
Affiliation:
AA(Lunar and Planetary Institute, Houston, Texas 77058, USA), AB(Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington DC 20015, USA), AC(Department of Earth & Planetary Sciences, University of California, Santa Cruz, California 95064, USA)
Publication:
Nature, Volume 453, Issue 7193, pp. 368-371 (2008). (Nature Homepage)
Publication Date:
05/2008
Origin:
NATURE
DOI:
10.1038/nature06911
Bibliographic Code:
2008Natur.453..368S

Abstract

The tectonic patterns and stress history of Europa are exceedingly complex and many large-scale features remain unexplained. True polar wander, involving reorientation of Europa's floating outer ice shell about the tidal axis with Jupiter, has been proposed as a possible explanation for some of the features. This mechanism is possible if the icy shell is latitudinally variable in thickness and decoupled from the rocky interior. It would impose high stress levels on the shell, leading to predictable fracture patterns. No satisfactory match to global-scale features has hitherto been found for polar wander stress patterns. Here we describe broad arcuate troughs and depressions on Europa that do not fit other proposed stress mechanisms in their current position. Using imaging from three spacecraft, we have mapped two global-scale organized concentric antipodal sets of arcuate troughs up to hundreds of kilometres long and 300m to ~1.5km deep. An excellent match to these features is found with stresses caused by an episode of ~80° true polar wander. These depressions also appear to be geographically related to other large-scale bright and dark lineaments, suggesting that many of Europa's tectonic patterns may also be related to true polar wander.
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