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Superplastic deformation of ice: Experimental observations
Creep experiments on fine-grained ice reveal the existence of three creep regimes: (1) a dislocation creep regime, (2) a superplastic flow regime in which grain boundary sliding is an importantExpand
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Friction falls towards zero in quartz rock as slip velocity approaches seismic rates
An important unsolved problem in earthquake mechanics is to determine the resistance to slip on faults in the Earth's crust during earthquakes. Knowledge of coseismic slip resistance is critical forExpand
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Viscous flow features on the surface of Mars: Observations from high‐resolution Mars Orbiter Camera (MOC) images
(10 5 –10 7 years) of the material. Our shear stress estimates of 10 � 1.5 –10 � 2.5 MPa yield strain rates on the order of 10 � 11 –10 � 16 s � 1 , which are within the superplastic flow regime ofExpand
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Constitutive relationships and physical basis of fault strength due to flash heating
[1] We develop a model of fault strength loss resulting from phase change at asperity contacts due to flash heating that considers a distribution of contact sizes and nonsteady state evolution ofExpand
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Low frictional strength of quartz rocks at subseismic slip rates
[1] Laboratory experiments on rocks at low sliding velocity typically yield values of the friction coefficient of 0.6–0.85. Here we demonstrate that an extraordinary decrease in friction coefficientExpand
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Grain boundary sliding in fine-grained ice I
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Flash Heating Leads to Low Frictional Strength of Crustal Rocks at Earthquake Slip Rates
Extreme temperatures generated over short distances may weaken faults during earthquakes. The sliding resistance of faults during earthquakes is a critical unknown in earthquake physics. The frictionExpand
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Geological evidence for solid-state convection in Europa's ice shell
The ice-rich surface of the jovian satellite Europa is sparsely cratered, suggesting that this moon might be geologically active today. Moreover, models of the satellite's interior indicate thatExpand
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Rheological and Thermal Properties of Icy Materials
Laboratory measurements of physical properties of planetary ices generate information for dynamical models of tectonically active icy bodies in the outer solar system. We review the methods forExpand
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