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Shock properties of H_2O ice

Stewart, Sarah T. and Ahrens, Thomas J. (2005) Shock properties of H_2O ice. Journal of Geophysical Research E, 110 (E3). Art. No. E03005. ISSN 0148-0227. doi:10.1029/2004JE002305.

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To understand the mechanics and thermodynamics of impacts on, and collisions between, icy planetary bodies, we measured the dynamic strength and shock states in H2O ice. Here, we expand upon previous analyses and present a complete description of the phases, temperature, entropy, and sound velocity along the ice shock Hugoniot. Derived from shock wave measurements centered at initial temperatures (T_0) of 100 K and 263 K, the Hugoniot is composed of five regions: (1) elastic shocks in ice Ih, (2) ice Ih deformation shocks, and shock transformation to (3) ice VI, (4) ice VII, and (5) liquid water. In each region, data obtained at different initial temperatures are described by a single U_S – Δu_p shock equation of state. The dynamic strength of ice Ih is strongly dependent on initial temperature, and the Hugoniot Elastic Limit varies from 0.05 to 0.62 GPa, as a function of temperature and peak shock stress. We present new bulk sound velocity measurements and release profiles from shock pressures between 0.4 and 1.2 GPa. We report revised values for the shock pressures required to induce incipient melting (0.6 ± 0.05, 1.6 ± 0.3 GPa) and complete melting (2.5 ± 0.1, 4.1 ± 0.3 GPa) upon isentropic release from the shock state (for T_0 = 263, 100 K). On account of the >40% density increase upon transformation from ice Ih to ices VI and VII, the critical shock pressures required for melting are factors of 2 to 10 lower than earlier predicted. Consequently, hypervelocity impact cratering on planetary surfaces and mutual collisions between porous cometesimals will result in abundant shock-induced melting throughout the solar system.

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Alternate Title:Shock properties of H2O ice
Additional Information:© 2005 by the American Geophysical Union. Received 10 June 2004; revised 28 October 2004; accepted 21 December 2004; published 18 March 2005. This work was supported by the Planetary Geology and Geophysics program under NASA Goddard grant NAG5-10198. We appreciate technical support from M. Long, E. Gelle, and C. McCaughey and thank B. Kamb for use of the Caltech cold laboratory. We are grateful to two anonymous reviewers and Francis Nimmo for their useful comments. Contribution 8946, Division of Geological and Planetary Sciences, California Institute of Technology.
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Subject Keywords:impact cratering; shock; water ice
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Caltech Division of Geological and Planetary Sciences8946
Issue or Number:E3
Record Number:CaltechAUTHORS:20141022-103932604
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Official Citation:Stewart, S. T., and T. J. Ahrens (2005), Shock properties of H2O ice, J. Geophys. Res., 110, E03005, doi:10.1029/2004JE002305
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50677
Deposited By: Tony Diaz
Deposited On:22 Oct 2014 19:09
Last Modified:10 Nov 2021 18:59

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