Impact of tsunami on texture and mineralogy of a major placer deposit in southwest coast of India

Local variation of inundation, sedimentary characteristics, and mineral assemblages of the 2011 Tohoku-oki tsunami on the Misawa coast, Aomori, Japan

“…In addition, the original beach sediment 24 before the 2011 tsunami is likely to be finer than our study samples collected after the event. Beach sediments before the 2004 IOT in Sumatra, Thailand, and India were reported to be finer than those after the event (Babu et al, 2007;Choowong et al, 2009;Paris et al, 2010). The mineral composition of the tsunami sediments is similar to that of the dune and beach sand on the Misawa coast and it supports this presumption that the tsunami sediment originated from a local source.…”

Subsurface Images Shed Light on Past Tsunamis in India

“…Following the event, sand deposits draped the low-lying areas and buried the muddy sediments of the coastal plain [Babu et al, 2007;Srinivasalu et al, 2007]. In addition, erosional features related to the tsunami, such as channels and scarps, have been observed along many parts of the coast (Figure 1a).…”

“…However, few reconstructions of extreme phenomena have a recent analog with which to compare the morphological and sedimentological signatures of a past event [Babu et al, 2007]. Because of its orientation relative to tsunamigenic regions of the Indian Ocean, the southeastern Indian coast presents an ideal region in which to compare both depositional and erosional features of the 2004 tsunami to those within the sedimentary record of prograded coastal plains.…”

“…These can be identified and mapped using near-surface geophysics. Ground-penetrating-radar (GPR) imaging has proven to be a successful tool for identifying and mapping sand-rich coastal sequences by providing high-resolution images of the extent and geometry of various boundaries of different rock and sediment types [Meyers et al, 1996;Babu et al, 2007;Buynevich et al, 2007]. GPR sections taken perpendicular to Mahabalipuram Beach reveal a series of three prominent, steep (10°-15°), seaward dipping reflectors, which are interpreted as buried disconformities resulting from past erosional events ( Figure 1b) surveys, these erosional features are shown to extend laterally over much of the coastline.…”

Effect of Tsunami in the Ilmenite Population: An Examination through X-Ray Diffraction, Scanning Electron Microscopy and Inductively Coupled Plasma Atomic Emission

“…Eyewitnesses conveyed that three waves have struck the low lying coastal plains sequentially and resulted in considerable damages. The impacts of tsunami mineralo -granulometic evaluation of beach placers of Kerala state have already been studied [1]. The effect of tsunami on sediments as well as floral and faunal assemblages have been reported elsewhere [2][3][4][5][6][7][8][9].…”