Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging
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 n...
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Online Access: | http://hdl.handle.net/10451/28094 https://doi.org/10.1371/journal.pone.0146578 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/28094 2023-05-15T13:37:42+02:00 Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio 2017-06-16T15:12:41Z http://hdl.handle.net/10451/28094 https://doi.org/10.1371/journal.pone.0146578 eng eng 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 http://hdl.handle.net/10451/28094 doi:10.1371/journal.pone.0146578 openAccess Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions article 2017 ftunivlisboa https://doi.org/10.1371/journal.pone.0146578 2022-05-25T18:36:49Z 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. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica Universidade de Lisboa: repositório.UL Antarctic PLOS ONE 11 1 e0146578 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions |
spellingShingle |
Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
topic_facet |
Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions |
description |
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. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio |
author_facet |
Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio |
author_sort |
Aymerich, Ismael F. |
title |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_short |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_full |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_fullStr |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_full_unstemmed |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_sort |
detection of tephra layers in antarctic sediment cores with hyperspectral imaging |
publishDate |
2017 |
url |
http://hdl.handle.net/10451/28094 https://doi.org/10.1371/journal.pone.0146578 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
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 http://hdl.handle.net/10451/28094 doi:10.1371/journal.pone.0146578 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1371/journal.pone.0146578 |
container_title |
PLOS ONE |
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11 |
container_issue |
1 |
container_start_page |
e0146578 |
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1766096903305428992 |