HR: 17:35h
AN: T24A-06    [Abstracts]
TI: Characteristics of nearshore marine tsunami sediments from SE coast of India
AU: * Jonathan, M
EM: mpjonathan7@yahoo.com
AF: Universidad Autónoma del Estado de Hidalgo, Centro de Investigaciones en Ciencias de la Tierra, Ciudad Universitaria, Carretera Pachuca-Tulancingo Km.4.5, Pachuca, HGO 42184, Mexico
AU: Srinivasalu, S
EM: ponmozhisrini2001@yahoo.com
AF: Anna University, Department of Geology, Guindy Campus , Chennai, TN 600025, India
AU: Thangadurai, N
EM: natarajanthangadurai@gmail.com
AF: Anna University, Department of Geology, Guindy Campus , Chennai, TN 600025, India
AU: Ram-Mohan, V
EM: rammohan.muniv@gmail.com
AF: University of Madras, Department of Geology Guindy Campus, Chennai, TN 600025, India
AB: The geologic records of tsunami deposits on coastal lands have been studied along the southeast coast of India. The December, 2004 tsunami sediments deposited in marine environment of Tamil Nadu State on the southeast coast of India were sampled within 5 days after the tsunami event and the samples were compared with the samples collected from the same locations 30 days before tsunami. Two core samples and 10 surface sediment samples were collected along two transects. The change in the bathymetry along transects, between pre and post tsunami conditions indicate both erosion and deposition in the continental shelf. Overall, there were erosion at 20 m water depth and deposition at 5 to 10 m water depth. The core samples collected from 20 m water depth show an abrupt change in sediment characteristics at 25 cm depth. A sand sheet is observed up to 25 cm depth and it has been recognized as tsunami deposit. The deposits are also enriched in heavy minerals, low in organic carbon, broken foraminiferal species, abraded test species indicating large amount of backwash from the land area.
DE: 3020 Littoral processes
DE: 4558 Sediment transport (1862)
DE: 4564 Tsunamis and storm surges
DE: 7221 Paleoseismology (8036)
SC: Tectonophysics [T]
MN: 2007 Joint Assembly