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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 2, Issue 12 (01/12/2014)

By Sakuna-schwartz, D.

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Book Id: WPLBN0004019314
Format Type: PDF Article :
File Size: Pages 43
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 2, Issue 12 (01/12/2014)  
Author: Sakuna-schwartz, D.
Volume: Vol. 2, Issue 12
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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Khokiattiwong, S., Schwarzer, K., Stattegger, K., Sakuna-Schwartz, D., & Feldens, P. (2014). Internal Structure of Event Layers Preserved on the Andaman Sea Continental Shelf, Thailand: Tsunami Vs. Storm and Flash Flood Deposits : Volume 2, Issue 12 (01/12/2014). Retrieved from

Description: Institute of Geosciences, Kiel University, Otto-Hahn-Platz 1, 24118 Kiel, Germany. Tsunami, storm and flash event layers, which have been deposited over the last century on the shelf offshore from 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, (2) cross lamination and (3) the appearance of rip-up clasts. Storm deposits found in core depths between 5 and 82 cm could be attributed to individual storm events by using 210Pb dating in conjunction with historical data of typhoons and tropical storms and could thus be securely differentiated from tsunami deposits. Massive sand layers enriched in shells and shell debris characterize the storm deposits. The last classified type of event layer represents flash floods, which is characterized by a fining-upward sequence of muddy sediment. The most distinct difference between the storm and tsunami deposits is the lack of rip-up clasts, mud, and terrigenous material within the storm deposits. Terrigenous material transported offshore during the tsunami backwash is therefore an important indicator to distinguish between offshore storm and tsunami deposits.

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

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