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Sedimentary records of tsunamis are a precious tool to assess the occurrenceof past events, as attested by an abundant literature, which has seen aparticular 'boom' in the aftermath of the 2004 Indian Ocean tsunami and the2011 Tohoku tsunami. Despite an extensive literature, there is very little tono understanding of the role that the changing coastal environment is playingon the record of a tsunami, and for a given location, it is still unclearwhether the largest tsunamis leave the largest amount of deposits. To researchthis question, the present study took place in Japan, in the Tohoku Region atAgawa-pond, because the pond act as a sediment trap. Using a sediment-slicer, a1 m thick deposit was retrieved, from which 4 tsunami sequences wereidentified, including the latest 2011 tsunami. Using a series of sedimentaryproxies: the AMS (Anisotropy of Magnetic Susceptibility), grain size analysis,quartz morphoscopy (morphology and surface characteristics) and the analysis ofmicrofossils, disparities between the tsunami deposits were identified and mostimportantly a clear thinning of the tsunami deposit towards the top. Providedthe present evidences, the authors discuss that the upward fining is due to atleast two components that are seldom assessed in tsunami research (1) amodification of the depositional environment, with the progressiveanthropization of the coast, providing less sediments to remobilize; and (2) aprogressive filling of the Agawa pond, which progressively loses its ability totrap tsunami materials.

Preliminary Report of the AMS analysis of tsunami deposits in Tohoku -- Japan -- 18th to the 21st Century