Could a strong earthquake trigger volcanic caldera activity in Indonesia and Sumatra basin?

There's an elevated possibility that strong plate pressure is building up under the eastern Indian ocean leading to a mive 9 or better earthquake. Also see http://edition.cnn.com/2007/WORLD/asiapcf/09/17/indonesia.quake/index.html - in the area there are a number of super volcanoes. My question relates to them. Could a strong earthquake trigger a permature or impending volcano erruption in this area and how realistic is this secnario given the relative large areas implicated?