Rumblings in Sumatra

"What is it likely we might learn from what is currently happening in Sumatra?"I'm sure there is work going on to look at the plumbing beneath the volcanoes and to ferret out connections between those magma sources and the subduction down below that is driving the quakes. But my suspicion (IANAG) is that below the volcanoes may be molten enough that plates slide smoothly there - the big quakes are shallower and seaward/trenchward, I think, where brittle failure of the rock is more possible.Sumatra's Volcanoes (Indonesia) | VolcanoDiscovery sort of supports my suspicion.