Abstract
Fast-food consumables like french fries are known to come in "super-size." According to Hollywood, tsunamis do also. But is there scientific evidence for super-size tsunamis in the past? The Indian Ocean tragedy has brought attention to the fact that these large water waves rank among earth's most severe natural disasters. Because water is incompressible, disturbance at the ocean floor generates a surface wave. In deep water such waves propagate at speeds (celerity) as high as 800 kilometers per hour, and their passage through the deep ocean is barely perceptible. As water depths shallow, however, wave energy becomes packed into a smaller column of water, the wave slows, or "shoals," and its form builds to fearsome proportions.