Change search
ReferencesLink to record
Permanent link

Direct link
Developing geochemical and mineralogical proxies for the correlation of paleotsunami layers
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0002-3866-1213
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The catastrophic Indian Ocean tsunami of December 2004 raised urgent questions about the paleotsunami history in the region. Numerous studies have since been conducted to gain better understanding of the magnitude, frequency and impact of past tsunamis, especially around the coasts of the Indian Ocean.

Southwest Thailand directly faces the Sunda Arc trench where the earthquake that generated the Indian Ocean tsunami took place. The lack of historical documents and of suitable geological archives makes paleotsunami research a challenge in this area however. Phra Thong Island, on the Andaman Coast of southwest Thailand, with its marshy swales has proven an exception and is one of the few suitable locations for these types of studies. Apart from the 2004 Indian Ocean tsunami layer, three to four more distinct paleotsunami layers, separated by organic rich soil horizons have been previously identified and dated using radiocarbon and Optically Stimulated Luminescence techniques. Despite these efforts, several outstanding issues have to be resolved: (1) the correlation of tsunami/paleotsunami layers over larger distances remains ambiguous, particularly older layers; (2) age attributions for several of the paleotsunami layers differ at different locations; and (3) alterations of soil and sand layers by postdepositional processes are still poorly understood

This thesis addresses these issues and aims to develop geochemical proxies that allow characterising each tsunami/paleotsunami layer in three different swales. As shown here, X-ray fluorescence elemental geochemistry, combined with loss-on-ignition analysis and mineralogical identification, is a promising tool for identifying paleotsunami layers. The specific geochemical signature of each sand layer can then be used for correlations over larger distances. This approach has the potential to provide a means for estimating past tsunami inundation distances, and thus their magnitude. 

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University , 2015. , 38 p.
National Category
Earth and Related Environmental Sciences
Research subject
Marine Geology
Identifiers
URN: urn:nbn:se:su:diva-116789OAI: oai:DiVA.org:su-116789DiVA: diva2:808175
Opponent
Supervisors
Available from: 2016-10-27 Created: 2015-04-27 Last updated: 2016-10-27Bibliographically approved

Open Access in DiVA

fulltext(12651 kB)16 downloads
File information
File name FULLTEXT01.pdfFile size 12651 kBChecksum SHA-512
c58688354feb5ad03c32cd67b1bd79bab96106a67685aa3b50cc3310217f7371bbe9844c71c31951ccfc2c3fc8f39972fe0c259df3be46e52d356d0c9f22a6ee
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Löwhagen, Linda
By organisation
Department of Geological Sciences
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 16 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 41 hits
ReferencesLink to record
Permanent link

Direct link