QUANTIFYING THE RHEOLOGY OF ICE IS PREREQUISITE FOR UNDERSTANDING HOW ICY SATELLITES BEHAVE. WE PROPOSE TO CONDUCT LABORATORY EXPERIMENTS TO EXPAND EXISTING KNOWLEDGE OF ICE DEFORMATION IN SEVERAL DISTINCT WAYS. WE WILL DEVELOP RATE-AND-STATE FORMULATION OF ICE FRICTION AT PLANETARY CONDITIONS WHICH WILL ALLOW FOR THE FIRST TIME AN ASSESSMENT OF THE LIKELY STYLE OF RUPTURE PROPAGATION ON ICY SATELLITES. WE WILL ALSO STUDY THE RHEOLOGICAL RESPONSE OF ICE UNDER MELT-BEARING CONDITIONS WHICH IS REQUIRED TO BE ABLE TO MODEL THE ORIGIN OF FEATURES IN WHICH MELTING IS THOUGH TO PLAY A ROLE. FINALLY WE WILL MEASURE THE TIME-DEPENDENT PROPERTIES OF TIDAL HEATING A COMBINATION OF SHEAR FRICTION ON NEAR SURFACE FAULTS AND VISCOELASTIC DISSIPATION (ATTENUATION) WITHIN THE BULK OF THEY ICY SHELL. MODELS OF LOCALIZED SHEAR HEATING TYPICALLY ASSUME CONSTANT OR AVERAGE SHEAR VELOCITIES ALONG FAULTS AND USE CONSTANT FRICTION COEFFICIENTS WHEREAS ACTUAL FAULTS ARE EXPERIENCING OSCILLATORY TIDAL STRESSING RESULTING IN OSCILLATORY VELOCITIES AND A FREQUENCY-DEPENDENT FRICTIONCOEFFICIENT. UNDERSTANDING THE DEPENDENCE OF SHEAR HEATING AND VISCOELASTIC DISSIPATION ON QUANTITIES SUCH AS FREQUENCY AND STRESS AMPLITUDE IS IMPORTANT NOT ONLY FOR UNDERSTANDING PRESENT-DAY TIDAL HEATING BUT IS ALSO CRUCIAL IN CALCULATING TIDAL TORQUES AND THUS THE LONG-TERM THERMAL-ORBITAL EVOLUTION OF SATELLITE SYSTEMS. THE PROPOSED WORK WILL COMBINE TWO WELL-ESTABLISHED TECHNIQUES FOR DYNAMIC MECHANICAL TESTING: THOSE FOR MEASURING THE FRICTIONAL RESPONSE OF ROCKS TO CYCLIC LOADING; AND THOSE FOR MEASURING THE ANELASTIC PROPERTIES OF ICE UNDER CYCLIC LOADING. WE WILL USE A HYBRID LOW-TEMPERATURE FRICTION AND CREEP/ATTENUATION APPARATUS CURRENTLY BEING CONSTRUCTED AT LAMONT. IN THE EXPERIMENT A CENTRAL ICE PIECE WILL BE FORCED BETWEEN TWO OUTER ICE PIECES WITH A SINUSOIDAL DRIVING STRESS # AT VARIOUS FREQUENCIES F AND TEMPERATURES T. THE EXPERIMENTAL CONDITIONS WE WILL EXPLORE ARE: 180<T(K)<240K; 10-4<F(HZ)<1; AND 0.02<#(MPA)<2MPA. WE WILL ADDITIONALLY EXPLORE THE ROLE OF MELT IN FRICTION BY USING SECOND PHASES THAT HAVE A DEEP EUTECTIC WITH ICE AND ARE PREDICTED TO BE IMPORTANT IN ICY SATELLITES: SULFURIC ACID AND AMMONIA. THE PROPOSED EXPERIMENT WILL CONTRIBUTE TO OUTER PLANET RESEARCH BY DEFINING THE DYNAMICAL PROCESSES OPERATING IN ICY SATELLITES AND IMPROVING UNDERSTANDING OF EVOLUTION OF OUTER SOLAR SYSTEM BODIES.