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Internal Structure of Event Layers Preserved on the Andaman Sea Continental Shelf, Thailand: Tsunami Vs. Storm and Flash-flood Deposits : Volume 15, Issue 6 (12/06/2015)

By Sakuna-schwartz, D.

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Book Id: WPLBN0003988795
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Internal Structure of Event Layers Preserved on the Andaman Sea Continental Shelf, Thailand: Tsunami Vs. Storm and Flash-flood Deposits : Volume 15, Issue 6 (12/06/2015)  
Author: Sakuna-schwartz, D.
Volume: Vol. 15, Issue 6
Language: English
Subject: Science, Natural, Hazards
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Feldens, P., Schwarzer, K., Khokiattiwong, S., Stattegger, K., & Sakuna-Schwartz, D. (2015). Internal Structure of Event Layers Preserved on the Andaman Sea Continental Shelf, Thailand: Tsunami Vs. Storm and Flash-flood Deposits : Volume 15, Issue 6 (12/06/2015). Retrieved from

Description: Institute of Geosciences, Kiel University, Otto-Hahn-Platz 1, 24118 Kiel, Germany. 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 210Pb 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 210Pb 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.

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

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