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What do we want to understand? • What is the flow pattern in the wedge mantle? – Temperature distribution (how hot is the corner?) – 2-D laminar flow versus 3-D flow involving trench parallel component? • Do subducting slabs contain a large amount of water (serpentine)? • What is the distribution of water in the wedge mantle? – Is the wedge mantle “wet” throughout, or is it “wet” only in limited regions? (Comparison to the continental tectosphere.) • Does basalt->eclogite transformation occur at equilibrium condition? • Do dehydration reactions cause earthquakes? – could dehydration reactions at high-P (V<0) cause instability? • Rheology, deformation fabrics (anisotropy), effects on geophysical observables – Effects of water and partial melting on rheology – Effects of water and partial melting on anisotropy, attenuation, (average) seismic wave velocity and electrical conductivity • Transport of water (fluids) – Porous flow, convection – How do melting and water flux interact? • Kinetics of phase transformations (e.g., basalt->eclogite) – Effects of water, grain-size (dependence on tectonic history) • Instability of deformation associated with dehydration reactions