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Title: High-frequency Coastal Overwash Deposits from Phra Thong Island, Thailand
Authors: Gouramanis, Chris
Switzer, Adam Douglas
Jankaew, Kruawun
Bristow, Charles S.
Pham, Dat T.
Ildefonso, Sorvigenaleon Ramos
Keywords: Stratigraphy
Indian Ocean Tsunami
Issue Date: 2017
Source: Gouramanis, C., Switzer, A. D., Jankaew, K., Bristow, C. S., Pham, D. T., & Ildefonso, S. R. (2017). High-frequency Coastal Overwash Deposits from Phra Thong Island, Thailand. Scientific Reports, 7, 43742-.
Series/Report no.: Scientific Reports
Abstract: The 26th December 2004 Indian Ocean Tsunami (IOT) emanated from an Mw 9.2 earthquake that generated a 1600 km-long rupture along the Sumatran Megathrust and generated tsunami waves up to 30 m high. The IOT directly impacted the Bay of Bengal and east Africa, with over 283,000 people perishing. At the time, this catastrophic event was considered unprecedented and sparked intense investigations to test this claim. It is now believed that four pre-2004 IOT events have occurred in the last 2500 years, recurring every 550 to 700 years. Much of this information comes from Phra Thong Island, Thailand, where a sequence of four stacked sandsheets separated by organic units has been recognised and compared to the 2004 IOT event. Recently, ground-penetrating radar on Phra Thong Island identified a region that could not be explained by the known stratigraphy. The stratigraphy of the area was investigated from auger cores and pits, and several previously-unrecognised sandsheets were identified and compared to the known tsunami sandsheets. The proximity of the newly-recognised sandsheets to the palaeo-coastline of Phra Thong Island does not preclude the impacts of localised storms in sandsheet emplacement or that tsunamigenic earthquake recurrence may have been more frequent in the past.
ISSN: 2045-2322
DOI: 10.1038/srep43742
Schools: Asian School of the Environment 
Research Centres: Earth Observatory of Singapore 
Rights: © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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