Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/28094
Título: Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging
Autor: Aymerich, Ismael F.
Oliva, Marc
Giralt, Santiago
Martín-Herrero, Julio
Palavras-chave: Antarctic Regions
Geologic Sediments
Optical Imaging
Spectrum Analysis
Volcanic Eruptions
Data: 2016
Citação: Aymerich IF, Oliva M, Giralt S, Martín-Herrero J (2016) Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging. PLoS ONE 11(1): e0146578. https://doi.org/10.1371/journal.pone.0146578
Resumo: Tephrochronology uses recognizable volcanic ash layers (from airborne pyroclastic deposits, or tephras) in geological strata to set unique time references for paleoenvironmental events across wide geographic areas. This involves the detection of tephra layers which sometimes are not evident to the naked eye, including the so-called cryptotephras. Tests that are expensive, time-consuming, and/or destructive are often required. Destructive testing for tephra layers of cores from difficult regions, such as Antarctica, which are useful sources of other kinds of information beyond tephras, is always undesirable. Here we propose hyperspectral imaging of cores, Self-Organizing Map (SOM) clustering of the preprocessed spectral signatures, and spatial analysis of the classified images as a convenient, fast, non-destructive method for tephra detection. We test the method in five sediment cores from three Antarctic lakes, and show its potential for detection of tephras and cryptotephras.
Peer review: yes
URI: http://hdl.handle.net/10451/28094
DOI: 10.1371/journal.pone.0146578
Aparece nas colecções:IGOT - Artigos em Revistas Internacionais

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