The devasting Indian Ocean tsunami 2004 which claimed more than 2,00,000 lives was not first of its kind.There are two studies was conducted .these studies proves something new about Indian Ocean tsunamis they says that it occurs every 600 years.
The fiirst research lead by Karin Monecke, former post-doctoal geologist at Kent State University in Aceh, Indonesia ,found that the 2004 sand sheet preceded deposits of three tsunamis from the past 1,200 years.
Another research team working independently concluded that a tsunamis of similar size struck the region between 1300 and 1400 AD according to a Kent state release.
Each team founds that more than 100 sediment cores collected during fieldwork in 2006 and 2007 and found traces of several tsunamis that may have occured during the last 2,500 years.