JUST ask Danny Hilman Natawidjaja about the potential of earthquakes in Sumatra—an island which receives much attention for being located along a subduction zone and has a fairly large parallel fault line over land and under its sea. This earthquake expert from the Center for Geotechnology Research at the National Institute of Sciences (LIPI) will be able to give you a very thorough answer.

He can tell you about the periodic cycles of earthqua