Projected Seismic Activity at the Tiger Stripe Fractures on Enceladus, Saturn, From an Analog Study of Tidally Modulated Icequakes Within the Ross Ice Shelf, Antarctica

Olsen, Kira G.; Hurford, Terry A.; Schmerr, Nicholas C.; Huang, Mong‐Han; Brunt, Kelly M.; Zipparo, Sophia; Cole, Hank M.; Aster, Richard C.

doi:10.1029/2021JE006862

Projected Seismic Activity at the Tiger Stripe Fractures on Enceladus, Saturn, From an Analog Study of Tidally Modulated Icequakes Within the Ross Ice Shelf, Antarctica

Journal Article · Mon Jun 07 00:00:00 EDT 2021 · Journal of Geophysical Research. Planets

DOI:https://doi.org/10.1029/2021JE006862· OSTI ID:1787165

^[1]; Hurford, Terry A. ^[1]; ^[2]; ^[2]; ^[3]; Zipparo, Sophia ^[2]; ^[4]; ^[4]

Geology, Geophysics and Geochemistry Laboratory NASA Goddard Space Flight Center Greenbelt MD USA
Department of Geology University of Maryland College Park MD USA
Cryospheric Science Laboratory NASA Goddard Space Flight Center Greenbelt MD USA, Earth SYstem Science Interdisciplinary Center University of Maryland College Park MD USA
Geosciences Department, Warner College of Natural Resources Colorado State University Fort Collins CO USA

Abstract

Dissipation of tidal energy is expected to generate seismicity on icy‐ocean worlds; however, the distribution and timing of this seismic activity throughout an orbital cycle is not known. We used new observations from an icy‐ocean‐world analog environment on Earth to examine the relationship between tidally driven tensile stress and seismic activity within an ice shell. We investigated a pair of rifts within Antarctica's Ross Ice Shelf which are tidally stressed in a manner analogous to the orbital cycle of tidal stress experienced by Enceladus' Tiger Stripe Fractures. We found that seismic activity at the Antarctic rifts is sensitive to both the amplitude and the rate of tensile stress across the rifts. We combined these findings with calculated stress values along Enceladus' Tiger Stripe Fractures to predict seismic‐activity levels expected along the ice‐shell fractures. We predict a peak in seismicity along the four Tiger Stripe Fractures when Enceladus is 90°–120° past pericenter in its orbit around Saturn, at which point tensile stresses would reach ∼2/3 of their maximum value. We also used the magnitude distribution of icequakes along Antarctic rifts to investigate implications for the likely size of stick‐slip rupture patches along icy faults on Enceladus. Our findings predict that the Tiger Stripe Fractures should produce sustained, low‐magnitude seismic events that involve rupture along discrete portions of each fracture's total length. We predict that seismicity would fall to 50% of peak levels when stresses across the Tiger Stripe Fractures are dominantly compressional.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1787165

Journal Information:: Journal of Geophysical Research. Planets, Journal Name: Journal of Geophysical Research. Planets Journal Issue: 6 Vol. 126; ISSN 2169-9097

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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