Internal structure of event layers preserved on the Andaman Sea continental shelf, Thailand: tsunami vs. storm and flash-flood deposits.

Sakuna-Schwartz, D., Feldens, Peter, Schwarzer, Klaus, Khokiattiwong, S. and Stattegger, Karl (2015) Internal structure of event layers preserved on the Andaman Sea continental shelf, Thailand: tsunami vs. storm and flash-flood deposits. Natural Hazards and Earth System Sciences, 15 (6). pp. 1181-1199. DOI 10.5194/nhess-15-1181-2015.

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Abstract

Tsunami, storm and flash-flood event layers, which have been deposited over the last century on the shelf offshore Khao Lak (Thailand, Andaman Sea), are identified in sediment cores based on sedimentary structures, grain size compositions, Ti/Ca ratios and Pb-210 activity. Individual offshore tsunami deposits are 12 to 30 cm in thickness and originate from the 2004 Indian Ocean Tsunami. They are characterized by (1) the appearance of sand layers enriched in shells and shell debris and (2) the appearance of mud and sand clasts. Storm deposits found in core depths between 5 and 82 cm could be attributed to recent storm events by using Pb-210 profiles in conjunction with historical data of typhoons and tropical storms. Massive sand layers enriched in shells and shell debris characterize storm deposits. The last classified type of event layer represents reworked flash-flood deposits, which are characterized by a fining-upward sequence of muddy sediment. The most distinct difference between storm and tsunami deposits is the lack of mud and sand clasts, mud content and terrigenous material within storm deposits. Terrigenous material transported offshore during the tsunami backwash is therefore an important indicator to distinguish between storm and tsunami deposits in offshore environments.

Document Type: Article
Additional Information: Times Cited: 0
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.5194/nhess-15-1181-2015
ISSN: 1561-8633
Projects: Future Ocean
Date Deposited: 18 Oct 2016 03:46
Last Modified: 23 Sep 2019 21:58
URI: http://oceanrep.geomar.de/id/eprint/32669

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