Supplementary Material for Larsson (2025) From the ashes: a 150th anniversary review of the Askja-1875 tephra

Supplementary material to the article "From the ashes: a 150th anniversary review of the Askja-1875 tephra" by S.A. Larsson, published in Dynamica through Stockholm University in 2025 (https://doi.org/10.58051/ns01-jf70). The material is published as a .xlsx spreadsheet file containing the following contents, divided onto separate sheets (also made available as separate .csv and .txt files):Table S1. Compilation of published raw (non-normalised) data from geochemical analyses of glass from the Askja-1875 tephra in the form of major-element oxide compositions provided as weight percentages.Table S2. Normalised data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions.Table S3. Centred log-ratio transformed selection of data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions.Table S4. Results of principal component analysis performed on centred log-ratio transformed selection of data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions.R code. Script used for data treatment and statistical analysis.References. List of references for the articles presenting the published raw data compiled in Table S1.