Distribution of strike-slip faults on Europa

Gregory Hoppa, Richard J. Greenberg, B. Randall Tufts, Paul Geissler, Cynthia Phillips, Moses Milazzo

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Study of four different regions on Europa imaged by the Galileo spacecraft during its first 15 orbits has revealed 117 strike-slip faults. Europa appears to form preferentially right-lateral faults in the southern hemisphere and left-lateral faults in the northern hemisphere. This observation is consistent with a model where diurnal tides due to orbital eccentricity drive strike-slip motion through a process of "walking," in which faults open and close out of phase with alternating right-and left-lateral shear. Lineaments that record both left-and right-lateral motion (e.g., Agave Linea) may record the accommodation of compression in nearby chaotic zones. Nearly all identified strike-slip faults were associated with double ridges or bands, and few were detected along ridgeless cracks. Thus the depth of cracks without ridges does not appear to have penetrated to the low-viscosity decoupling layer, required for diurnal displacement, but cracks that have developed ridges do extend down to such a level. This result supports a model for ridge formation that requires cracks to penetrate to a decoupling layer, such as a liquid water ocean.

Original languageEnglish (US)
Pages (from-to)22617-22627
Number of pages11
JournalJournal of Geophysical Research: Space Physics
Volume105
Issue numberE9
StatePublished - Sep 25 2000

Fingerprint

Strike-slip faults
Europa
strike-slip fault
ridges
crack
slip
cracks
Cracks
decoupling
Galileo spacecraft
walking
accommodation
Tides
Southern Hemisphere
Northern Hemisphere
tides
lineament
eccentricity
Spacecraft
oceans

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hoppa, G., Greenberg, R. J., Tufts, B. R., Geissler, P., Phillips, C., & Milazzo, M. (2000). Distribution of strike-slip faults on Europa. Journal of Geophysical Research: Space Physics, 105(E9), 22617-22627.

Distribution of strike-slip faults on Europa. / Hoppa, Gregory; Greenberg, Richard J.; Tufts, B. Randall; Geissler, Paul; Phillips, Cynthia; Milazzo, Moses.

In: Journal of Geophysical Research: Space Physics, Vol. 105, No. E9, 25.09.2000, p. 22617-22627.

Research output: Contribution to journalArticle

Hoppa, G, Greenberg, RJ, Tufts, BR, Geissler, P, Phillips, C & Milazzo, M 2000, 'Distribution of strike-slip faults on Europa', Journal of Geophysical Research: Space Physics, vol. 105, no. E9, pp. 22617-22627.
Hoppa G, Greenberg RJ, Tufts BR, Geissler P, Phillips C, Milazzo M. Distribution of strike-slip faults on Europa. Journal of Geophysical Research: Space Physics. 2000 Sep 25;105(E9):22617-22627.
Hoppa, Gregory ; Greenberg, Richard J. ; Tufts, B. Randall ; Geissler, Paul ; Phillips, Cynthia ; Milazzo, Moses. / Distribution of strike-slip faults on Europa. In: Journal of Geophysical Research: Space Physics. 2000 ; Vol. 105, No. E9. pp. 22617-22627.
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