Abstract
The ice crust of Europa probably floats over a deep liquid-water ocean, and has been continually resurfaced by tectonic and thermal processes driven by tides. Tidal working causes rotational torque, surface stress, internal heating, and orbital evolution. The stress patterns expected on such a crust due to reorientation of the tidal bulge by non-synchronous rotation and due to orbital eccentricity, which introduces periodic ('diurnal') variations in the tide, are shown as global maps. By taking into account the finite rate of crack propagation, global maps are generated of cycloidal features and other distinctive patterns, including the crack shapes characteristic of the wedges region and its antipode on the sub-Jovian hemisphere. Theoretical maps of tidal stress and cracking can be compared with observed tectonics, with the possibility of reconstructing the rotational history of the satellite.
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References
Anderson, J. D. et al.: 1998, 'Europa's differentiated internal structure: Inferences from four Galileo encounters', Science 281, 2019-2022.
Bart, G. D., Greenberg, R., Hoppa, G. V. and Hurford, T. A.: 2002, 'Global patterns of diurnal tensile cracking on Europa', Bull. Amer. Astron. Soc. 34, 915.
Figueredo, P. H. and Greeley, R.: 2000, 'Geologic mapping of the northern leading hemisphere of Europa', J. Geophys. Res. 105, 22629-22646.
Gammon, P. H., Klefte, H. and Klouter, M. J.: 1983, 'Elastic constants of ice samples by Brillouin spectroscopy', J. Phys. Chem. 87, 4025-4029.
Geissler, P. et al.: 1998a, 'Evidence for non-synchronous rotation of Europa', Nature 391, 368-370.
Geissler, P. et al.: 1998b, 'Evolution of lineaments on Europa: Clues from Galileo multispectral imaging observations', Icarus 135, 107-126.
Greenberg, R.: 1982, 'Orbital evolution of the galilean satellites'. In: D. Morrison (eds), The Satellites of Jupiter, University of Arizona Press, Tucson, pp. 65-92.
Greenberg, R.: 1989, 'Time-varying orbits and tidal heating of the galilean satellites', In: Belton, M. J. S., West, R. A. and Rahe, J. (eds), Time-Variable Phenomena in the Jovian System, ASA Special Publication No. 494.
Greenberg, R.: 2002, 'Tidal processes and the geophysics of Europa (invited review)', In: IAU Colloquium No. 189 “Astrophysical Tides”, Nanjing, China.
Greenberg, R. and Weidenschilling, S. J.: 1984, 'How fast do Galilean satellites spin?', Icarus 58, 186-196.
Greenberg, R. et al.: 1998, 'Tectonic processes on Europa: Tidal stresses, mechanical response, and visible features', Icarus 135, 64-78.
Greenberg, R. et al.: 2002a, 'Tidal tectonic processes and their implications for the character of Europa's icy crust (invited review)', Rev. Geophysics 40(2), 1004.
Greenberg, R., Hoppa, G. V., Geissler, P., Sarid, A. and Tufts, B. R.: 2002b, 'The rotation of Europa', Celestial Mechanics and Dynamical Astronomy 83, 35-47.
Helfenstein, P. and Parmentier, E. M.: 1983, 'Patterns of fracture and tidal stresses on Europa', Icarus 53, 415-430.
Helfenstein, P. and Parmentier, E. M.: 1985, 'Patterns of fracture and tidal stresses due to nonsynchronous rotation: Implications for fracturing on Europa', Icarus 61, 175-184.
Hoppa, G. V. et al.: 1999a, 'Strike-slip faults on Europa: Global shear patterns driven by tidal stress', Icarus 141, 287-298.
Hoppa, G. V. et al.: 1999b, 'Formation of cycloidal features on Europa', Science 285, 1899-1902.
Hoppa, G. V. et al.: 2000, 'Distribution of strike-slip faults on Europa', J. Geophys. Res.-Planets 105, E9, 22617-22627.
Hoppa, G. V. et al.: 2001, 'Europa's rate of rotation derived from the tectonic sequence in the Astypalaea region', Icarus 153, 208-213.
Kattenhorn, S. A.: 2002, 'Nonsynchronous rotation evidence and fracture history in the Bright Plains region, Europa', Icarus 157, 490-506.
McEwen, A. S.: 1986, 'Tidal reorientation and the fracturing of Jupiter's moon Europa', Nature 321, 49-51.
Melosh, H. J.: 1980, 'Tectonics patterns on a tidally distorted planet', Icarus 43, 334-337.
Moore, W. B. and Schubert, G.: 2000, 'The tidal response of Europa', Icarus 147, 317-319.
O'Brien, D. P., Geissler, P. and Greenberg, R.: 2002, 'A melt-through model for chaos formation on Europa', Icarus 156, 152-161.
Peale, S. J. and Lee, M. H.: 2002, 'A primordial origin of the Laplace relation among the Galilean satellites', Science 298, 593-597.
Sarid, A. R., Greenberg, R., Hoppa, G. V., Hurford, T. A., Tufts, B. R. and Geissler, P.: 2002, 'Polar wander and surface convergence on Europa: Evidence from a survey of strike-slip displacement', Icarus 158, 24-41.
Suppe, J.: 1985, Principles of Structural Geology, Prentice-Hall, Englewood Cliffs, NJ.
Turcotte, D. L. and Schubert, G.: 1982, Geodynamics, Wiley, New York.
Vening-Meinisz, F. A.: 1947, 'Shear patterns of the Earth's crust', Trans. AGU 28, 1-61.
Yoder, C. F. and Sjogren, W. L.: 1996, 'Tides on Europa', In: Europa Ocean Conference, San Juan Capistrano Institute, San Juan Capistrano, California, p. 89.
Zahnle, K. et al.: 1998, 'Cratering rates on the Galilean satellites', Icarus 136, 202-222.