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.
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.
|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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