Recognition of diagnostic criteria for recent- and paleo-tsunami sediments from Sri Lanka

Dahanayake, Kapila; Kulasena, Nayomi

doi:10.1016/j.margeo.2008.06.005

Cited by 41 publications

(16 citation statements)

References 10 publications

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“…Goff et al, 2001). Pollen data are now being used more rigorously to indicate the ecological impact of marine inundation as a guide to the environmental significance of an event (Hughes and Mathewes, 2003;Smith, et al, 2004;Dahanayake and Kulasena, 2008;Mamo et al, 2009 and references therein). Geochemical indicators in sediments have tended to be a somewhat forgotten or underappreciated proxy, and yet are equally as useful as their micropalaeontological counterparts (Chagué- Goff and Goff, 1999;Chagué-Goff, 2010).…”

Section: Introductionmentioning

confidence: 99%

Multi-proxy records of regionally-sourced tsunamis, New Zealand

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Multi-proxy records of regionally-sourced tsunamis, New Zealand

et al. 2010

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“…The grain size of deposits depends upon the grain size of the sediment available for transportation (Srinivasulu et al 2007). From figure 6, we observed the angular character of the quartz grains from SEM studies, which might be due to the transportation of sediments from offshore to land which is not subjected to the beach rounding of sand grains (Dahanayake and Kulasena 2008). The sediments were devoid of marine fossils indicating that sands were originated from a seaward source that were transported by flooding events associated with extreme wave events as exhibited in the southern Kuril trench reported by Nanayama et al (2007) and substantiated the considerable alteration patterns on the placer minerals.…”

Section: Discussionmentioning

confidence: 97%

Granularity and textural analysis as a proxy for extreme wave events in southeast coast of India

et al. 2010

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Extreme wave events of 1000 and 1500 years (radiocarbon ages) have been recently reported in Mahabalipuram region, southeast coast of India. Subsequently, we carried out extensive sedimentological analysis in regions covering a total lateral coverage of 12 km with a new archeological site as the central portion of the study area. Twelve trenches in shore normal profiles exhibit landward thinning sequences as well as upward fining sequences confirming with the global signatures of extreme wave events. The sediment size ranges from fine-to-medium and moderately well sorted-to-well sorted, and exhibit positive skewness with platykurtic-to-leptokurtic nature. We now propose the abrupt winnowing or back and forth motion including unidirectional transport of these deposited sediments, which results in positive skewness. Textural analyses derived from scanning electron microscope studies (SEM) demonstrate the alteration produced, in the ilmenite mineral with vivid presence of pits and crescents with deformation observed on the surface due to extreme wave activities. This is further confirmed with the predominance of high-density mineral such as magnetite (5.2) and other heavy minerals in these deposits inferred the high-intensity of the reworking process of the beach shelf sediments.

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“…Rajendran et al, 2008;Sieh et al, 2008), the research on coasts distant from the seismic zones, such as SW Thailand, concentrates on sedimentary evidence of tsunami impacts (e.g. Monecke et al, 2008;Dahanayake and Kulasena, 2008;Jankaew et al, 2008, Brill et al, 2011. However, due to the lack of archives along the west coast of Thailand, an accurate chronology remains to be defined.…”

Section: Introductionmentioning

confidence: 99%

Local inundation distances and regional tsunami recurrence in the Indian Ocean inferred from luminescence dating of sandy deposits in Thailand

Brill¹,

Klasen²,

Jankaew

et al. 2012

Nat. Hazards Earth Syst. Sci.

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<p><strong>Abstract.</strong> The Holocene beach-ridge plain of Phra Thong Island (Ko Phra Thong, SW Thailand) provides sedimentary evidence of several palaeotsunamis, in addition to the deposit of the 2004 Indian Ocean tsunami. Due to poor preservation conditions, these palaeoevent layers are restricted to swales. Correlation across beach ridges, which is important e.g. to reconstruct inundation distances, remains a major challenge. A primary tool for establishing a precisely confined correlation of the sand sheets is the use of chronological data. Since the application of radiocarbon dating is limited by the scarcity of appropriate material, this study utilised optically stimulated luminescence (OSL) dating of tsunamigenic quartz grains. Generally, the sediments showed favourable luminescence properties regarding signal intensity, dose recovery and thermal stability. Disturbances of the OSL signal due to partial bleaching were corrected using the minimum age model. At least three palaeoevents – being 490–550, 925–1035 and 1740–2000 yr old – were distinguished by dating the discontinuous sand sheets at four different sites. Besides this chronological framework, the OSL data provide the opportunity to correlate the discontinuous sand sheets between spatially separated sites within the same swale as well as across ridges. This allows for first estimates of inundation distances for the palaeotsunamis documented on Phra Thong Island. Furthermore, the two younger events overlap in age with contemporaneous tsunami and earthquake evidence from other coasts bordering the Indian Ocean.</p>

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Recognition of diagnostic criteria for recent- and paleo-tsunami sediments from Sri Lanka

Cited by 41 publications

References 10 publications

Multi-proxy records of regionally-sourced tsunamis, New Zealand

Multi-proxy records of regionally-sourced tsunamis, New Zealand

Granularity and textural analysis as a proxy for extreme wave events in southeast coast of India

Local inundation distances and regional tsunami recurrence in the Indian Ocean inferred from luminescence dating of sandy deposits in Thailand

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