Strike-slip faults on Europa: Global shear patterns driven by tidal stress

Gregory Hoppa, B. Randall Tufts, Richard J. Greenberg, Paul Geissler

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Diurnal tides due to orbital eccentricity may drive strike-slip motion on Europa through a process of "walking" in which faults open and close out of phase with alternate right- and left-lateral shear. Mapping of five different regions on Europa has revealed 121 strike-slip faults, including Astypalaea Linea, a 800-km-long fault with 42 km of right-lateral offset. At high southern latitudes near Astypalaea Linea all of the strike slip faults identified were right-lateral. Europa appears to preferentially form right-lateral faults in the southern hemisphere and left-lateral faults in the northern hemisphere, consistent with tidal walking. At the five locations, nonsynchronous rotation explains the azimuthal orientations and distribution of sense of shear, which fit formation ∼60° to 90° west of their current positions. Alternatively, stress due to differential rotation might also explain the observed shear patterns. Nearly all identified strike-slip faults were associated with double ridges or bands, but few were detected along ridgeless cracks (even older ones). Thus, cracks without ridges may not have penetrated to a decoupling layer, consistent with the models for ridge formation that require cracks to penetrate to a liquid water ocean.

Original languageEnglish (US)
Pages (from-to)287-298
Number of pages12
JournalIcarus
Volume141
Issue number2
DOIs
StatePublished - Oct 1999

Fingerprint

Europa
strike-slip fault
slip
shear
ridges
crack
walking
cracks
Southern Hemisphere
Northern Hemisphere
tides
eccentricity
decoupling
oceans
tide
orbitals
liquid
ocean
liquids
water

Keywords

  • Europa
  • Satellites of Jupiter
  • Tectonics
  • Tides

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Strike-slip faults on Europa : Global shear patterns driven by tidal stress. / Hoppa, Gregory; Tufts, B. Randall; Greenberg, Richard J.; Geissler, Paul.

In: Icarus, Vol. 141, No. 2, 10.1999, p. 287-298.

Research output: Contribution to journalArticle

Hoppa, Gregory ; Tufts, B. Randall ; Greenberg, Richard J. ; Geissler, Paul. / Strike-slip faults on Europa : Global shear patterns driven by tidal stress. In: Icarus. 1999 ; Vol. 141, No. 2. pp. 287-298.
@article{b184c8758a2248f8b92a1d43a473d889,
title = "Strike-slip faults on Europa: Global shear patterns driven by tidal stress",
abstract = "Diurnal tides due to orbital eccentricity may drive strike-slip motion on Europa through a process of {"}walking{"} in which faults open and close out of phase with alternate right- and left-lateral shear. Mapping of five different regions on Europa has revealed 121 strike-slip faults, including Astypalaea Linea, a 800-km-long fault with 42 km of right-lateral offset. At high southern latitudes near Astypalaea Linea all of the strike slip faults identified were right-lateral. Europa appears to preferentially form right-lateral faults in the southern hemisphere and left-lateral faults in the northern hemisphere, consistent with tidal walking. At the five locations, nonsynchronous rotation explains the azimuthal orientations and distribution of sense of shear, which fit formation ∼60° to 90° west of their current positions. Alternatively, stress due to differential rotation might also explain the observed shear patterns. Nearly all identified strike-slip faults were associated with double ridges or bands, but few were detected along ridgeless cracks (even older ones). Thus, cracks without ridges may not have penetrated to a decoupling layer, consistent with the models for ridge formation that require cracks to penetrate to a liquid water ocean.",
keywords = "Europa, Satellites of Jupiter, Tectonics, Tides",
author = "Gregory Hoppa and Tufts, {B. Randall} and Greenberg, {Richard J.} and Paul Geissler",
year = "1999",
month = "10",
doi = "10.1006/icar.1999.6185",
language = "English (US)",
volume = "141",
pages = "287--298",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Strike-slip faults on Europa

T2 - Global shear patterns driven by tidal stress

AU - Hoppa, Gregory

AU - Tufts, B. Randall

AU - Greenberg, Richard J.

AU - Geissler, Paul

PY - 1999/10

Y1 - 1999/10

N2 - Diurnal tides due to orbital eccentricity may drive strike-slip motion on Europa through a process of "walking" in which faults open and close out of phase with alternate right- and left-lateral shear. Mapping of five different regions on Europa has revealed 121 strike-slip faults, including Astypalaea Linea, a 800-km-long fault with 42 km of right-lateral offset. At high southern latitudes near Astypalaea Linea all of the strike slip faults identified were right-lateral. Europa appears to preferentially form right-lateral faults in the southern hemisphere and left-lateral faults in the northern hemisphere, consistent with tidal walking. At the five locations, nonsynchronous rotation explains the azimuthal orientations and distribution of sense of shear, which fit formation ∼60° to 90° west of their current positions. Alternatively, stress due to differential rotation might also explain the observed shear patterns. Nearly all identified strike-slip faults were associated with double ridges or bands, but few were detected along ridgeless cracks (even older ones). Thus, cracks without ridges may not have penetrated to a decoupling layer, consistent with the models for ridge formation that require cracks to penetrate to a liquid water ocean.

AB - Diurnal tides due to orbital eccentricity may drive strike-slip motion on Europa through a process of "walking" in which faults open and close out of phase with alternate right- and left-lateral shear. Mapping of five different regions on Europa has revealed 121 strike-slip faults, including Astypalaea Linea, a 800-km-long fault with 42 km of right-lateral offset. At high southern latitudes near Astypalaea Linea all of the strike slip faults identified were right-lateral. Europa appears to preferentially form right-lateral faults in the southern hemisphere and left-lateral faults in the northern hemisphere, consistent with tidal walking. At the five locations, nonsynchronous rotation explains the azimuthal orientations and distribution of sense of shear, which fit formation ∼60° to 90° west of their current positions. Alternatively, stress due to differential rotation might also explain the observed shear patterns. Nearly all identified strike-slip faults were associated with double ridges or bands, but few were detected along ridgeless cracks (even older ones). Thus, cracks without ridges may not have penetrated to a decoupling layer, consistent with the models for ridge formation that require cracks to penetrate to a liquid water ocean.

KW - Europa

KW - Satellites of Jupiter

KW - Tectonics

KW - Tides

UR - http://www.scopus.com/inward/record.url?scp=0033210467&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033210467&partnerID=8YFLogxK

U2 - 10.1006/icar.1999.6185

DO - 10.1006/icar.1999.6185

M3 - Article

AN - SCOPUS:0033210467

VL - 141

SP - 287

EP - 298

JO - Icarus

JF - Icarus

SN - 0019-1035

IS - 2

ER -