A study was made on samples from one core collected immediately after the December 2004 Asian tsunami to know the geochemical nature of the offshore tsunami sediments. The core sample was analyzed for sediment grain size, CaCO<Subscript>3</Subscript>, organic carbon (OC) and major elements (SiO<Subscript>2</Subscript>, TiO<Subscript>2</Subscript>, Al<Subscript>2</Subscript>O<Subscript>3</Subscript>, Fe<Subscript>2</Subscript>O<Subscript>3</Subscript>,...</subscript></subscript></subscript></subscript></subscript></subscript></subscript>