The history of strike-slip formation on Europa as inferred from the shell tectonics model

Details The history of strike-slip formation on Europa as inferred from the shell tectonics model The history of strike-slip formation on Europa as inferred from the shell tectonics model

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1611r&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1611

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Scientific paper

The formation of strike-slip faults on Europa has been linked to tidal stresses, which change in magnitude and direction due to Europa's orbital eccentricity [2]. We have developed a linear elastic model that describes the response of a fault to such time-varying shear and normal stresses [5]. This mechanical model, called shell tectonics, predicts the net slip direction and rate of offset accumulation along preexisting faults. Using a tidal model that includes a small amount of obliquity, shell tectonics correctly predicts the slip directions of 75% of observed faults from a comprehensive survey by [6]. Further statistical analysis shows that approximately half of the observed faults were likely to have formed recently at their present locations. The remaining faults have either migrated in longitude (perhaps due to non-synchronous rotation of the icy shell), are old faults that have had enough time to accumulate significant offsets despite being "slow-slippers", or were formed by a process other than tidal shear stress. We apply additional statistical tests to examine the likelihood of each of these scenarios and construct a history of strike-slip formation on Europa.

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