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Identification of Tsunami Deposits in the Geologic Record; Developing Criteria Using Recent Tsunami Deposits: Open-File Report 2010-1239
Robert Peters
(Author)
·
United U. S. Department of the Interior
(Author)
·
Bruce Jaffe
(Author)
·
Bibliogov
· Paperback
Identification of Tsunami Deposits in the Geologic Record; Developing Criteria Using Recent Tsunami Deposits: Open-File Report 2010-1239 - Peters, Robert ; Jaffe, Bruce ; U. S. Department of the Interior, United
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Synopsis "Identification of Tsunami Deposits in the Geologic Record; Developing Criteria Using Recent Tsunami Deposits: Open-File Report 2010-1239"
There is a need for a clear procedure to identify tsunami deposits in the geologic record. Data from published studies documenting recent tsunami deposits provide a means of developing identification criteria based on the sedimentary characteristics of unequivocal tsunami deposits. Recent tsunami deposits have many sedimentary characteristics in common. All had sharp or erosional basal contacts. Sand was typically deposited in sheets that blanketed pre-existing topography and generally thinned landward. Deposit thickness was dependent on local topography; deposits were thicker in swales or local depressions and thinner on ridges or topographic highs. Deposits typically had 1-4 layers. Normal grading was common and often confined to individual layers. In muddy environments, sediments contained mud and soil rip-up clasts and mud often capped the deposits or layers. Boulders were often present, either isolated or scattered in groups. Sedimentary structures were rare, and included cross-bedding, laminations, scour and fill structures, and truncated flame structures. The composition, grain size, and surface texture of the grains reflected the coastal and nearshore source for the sediments. These sedimentary characteristics are the basis for developing site-specific tsunami deposit identification criteria that can be used in paleotsunami deposits investigations.
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The book is written in English.
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