Abstract
Immediately following the 2004 Indian Ocean tsunami, tsunami deposits have been studied well by many research teams. Especially, influences of the tsunami at the shallow sea and intertidal zone, sedimentary characteristics of tsunami deposits on land, and erosion and preservation processes were studied well. These new knowledge would contribute to advance the studies of past and modern tsunami deposits. On the other hand, data that should have been taken immediately after the event was not obtained sufficiently due to the absence of a manual for geologists at the emergency survey. Limited survey time and research fund as well as the less communication among researchers also prevent to collect important tsunami data after the event. Moreover, there are new problems that were raised (or not clarified) from the studies of the tsunami deposits. For example, (1) unique characteristics of the tsunami deposits, (2) the relationship between the hydraulic values of tsunami and sedimentary process of tsunami deposits, and (3) sedimentary characteristics of tsunami deposits under the sea have not yet been understood well. In order to clarify these problems, corroboration and complementary study among different research fields are highly required.
