Polish Journal of Environmental Studies
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ISO Abbrev. Title: Pol. J. Environ. Stud.

Vol. 18, No. 1 (2009), 17-23


Depositional Effects of 2004 Tsunami and Hypothetical Paleotsunami Near Thap Lamu Navy Base in Phang Nga Province, Thailand

S. Yawsangratt1,2, W. Szczuciński1, N. Chaimanee3, R. Jagodziński1, S. Lorenc1, S. Chatprasert2, D. Saisuttichai2, T. Tepsuwan2

1Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland
2Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand
3CCOP, Bangkok, Thailand


Abstract: On December 26th, 2004, a tsunami hit the Andaman Sea coast of Thailand, leaving bimodal tsunami deposits in the coastal zone. Granite boulders and sandy tsunami deposits were investigated near Thap Lamu Navy Base in Phang Nga Province, Thailand. Boulders (< 2.5m3) were mostly scattered close to a tidal inlet on a flat plain elevated 1-2m above the high tide water level, reaching up to 140m inland. Most boulders had oyster shell remnants over their surface, which suggests that they were dragged from the nearby shore. The tsunami also brought a sheet of medium to coarse grained sand, with thickness ranging from a few mm up to 37cm. The distribution of deposits was mainly controlled by the existing topography. Another group of granite boulders was found between 150 and 300m from the coastline, at elevations of 2m and more. Their size reached 5.5m3. This second group of boulders may have been transported by an ancient tsunami.

 

Keywords: tsunami deposits, boulders, paleotsunami, Andaman Sea, Thailand


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