The tsunami of 11th March 2011 was originated at the east coast of Japan and
deposited ca. 1 cm. thick sediment layer along the coast of southwestern Mexico up to a
maximum distance of 320m from the beach. The sedimentological, mineralogical and
geochemical characteristics of the sediments deposited during the tsunami (JT) are compared
with the pre-tsunami sediments (PRT). JT sediments consist of dominant coarser fractions
(>54% of medium to coarse sand), whereas PRT deposits comprise abundant finer fractions
(>58% of fine sand). Assemblage of mafic and heavy minerals suggests similar provenance for
both. The higher abundance and variation of heavy minerals along with higher concentrations of
bromine (Br) and sodium (Na) in the JT deposits reveal the influence of high energy sea waves
in transportation of heavy mineral rich coarse sediments onto the coastal lowlands.