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. 2017 Sep 25;7:12238. doi: 10.1038/s41598-017-11758-0

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A–E) Representative secondary electron microscope images of tephra filtered from sample 2660.000. The glass particles show equant to platy morphologies and round to elongated vesicles. Scale bars are 5 microns. (F) Secondary electron images of glass shards from near-source tephra deposits from the Oruanui eruption (sample location in decimal degrees 38.54055S, 176.07601E), sampled on land. Scale bar is 100 microns.