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At 02:37 PM 2001/06/08 +0100, Tim Charlton wrote: >... >I don't see that Indonesia is a special case. Indeed it is a good example >of the east-west subduction zone asymmetry emphasised by John Milsom. The >continentally-attached Sunda Trench off the western margin of Sumatra links >via the east-west Java trench to the detached and arcuate east-facing Banda >Arc. Agreed. Another good example is the west-facing, steep-dipping, "roll-backing" slab under Italy and the east-facing, shallow-dipping slab under Yugoslavia/Greece, recently used by Doglioni et al (1999, Orogens and slabs vs their direction of subduction, Earth Sci Reviews 45, 167-208) to shoot down an older idea that the east-west subduction asymmetry across the Pacific was due to the east-dipping plates being systematically younger. Dugald