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Micromorphological analysis of coastal sediments from Willapa Bay, Washington, USA : a technique for analysing inferred tsunami deposits.

Kilfeather, A. A. and Blackford, J. J. and Jaap, J. M. van der Meer (2007) 'Micromorphological analysis of coastal sediments from Willapa Bay, Washington, USA : a technique for analysing inferred tsunami deposits.', Pure and applied geophysics., 164 (2-3). pp. 509-525.

Abstract

Tsunami deposits are provisionally distinguished in the field on the basis of anomalous sand horizons, fining-up and fining-landward, coupled with organic-rich, fragmented `backwash' sediments. In this paper, micromorphological features of a sediment sequence previously interpreted as being of tsunami origin are described. These characteristics are shown to be consistent with the macro-scale features used elsewhere, but show additional details not seen in standard stratigraphies, including possible evidence for individual waves, possibly wave-magnitude progression, organic fragment alignment and intraclast microstructures. Although replication and more complete studies are needed, this analysis confirms the identification of a tsunami in Willapa Bay in ca.1700 AD, while demonstrating a widely applicable technique for confirming or refuting possible tsunami deposits.

Item Type:Article
Keywords:Tsunami, Micromorphology, Cascadia subduction zone, Willapa Bay, Washington, Thin sections.
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1007/s00024-006-0173-4
Record Created:16 Sep 2009 11:20
Last Modified:13 Sep 2010 17:01

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