Small islands in the South China Sea will not lose elevation as a result of plate movement, as the Philippine Plate will push under the great Eurasian Plate at this point, if anything giving them a slight boost. It is the coastline of south China below Taiwan that will lose sea level when the tongue holding Indonesia is pushed down. What these small islands in the South China Sea need to fear is that the tidal waves will wash over them, due to their small size and relatively low elevation. There is no way on any of these small islands to be 100 miles inland from the coast. The tidal waves will wash over these islands, with scarce a spot to cling to.
ZetaTalk October, 2010