The EGU conference is packed, and this blog isn't anything remotely like real-time, but some interesting talks came up on Monday evening :

Simon Katterhorn gave a neat presentarion on icy moon tectonics, specifically on Europa and Enceladus. He showed the cycloid tracks on Europa, and how these are probably generated by tidally-driven ice tectonics. The presence of these of different ages shows the existence of a global ocean underneath, and the decoupled ice shell on top. More on this can be seen in Greenbergs book on Europa; but he also showed further follow-on work on Enceladus. Enceladus is small enough that people thought it had cooled and could not support an ocean, explaining the geysers and plumes by "small reservoirs". He shows instead that the 'tiger stripes' at the south pole are also tidally-created stresses, and moreover older generations of stripes, at an angle to the current ones, are also present: the plumes occur at the intersections. This shows free rotation of the ice shell and almost certainly an ocean. As to how to heat it: tidal heating is the primary candidate.

I'm looking forward to Tidal heating and orbital evolution of Enceladus on Thursday.