Data set S1 for "Cluster analysis for a standardized classification and description of volcanic ash: Case study of the 1983 eruption at Miyakejima, Japan"

This dataset contain volcanic ash grain data that we obtained and used. As shown in the main text, grain data was obtained using an automated grain analyzer (Morphologi G3S (Malvern Instrument Ltd.)).The structure of the dataset is<br>/morphologi_data This directory contains grain data for each sample measured by Morphologi G3S (Malvern Panalytical Ltd.).<br>/results This directory contains the results of the cluster analysis.<br>/results/centroids This directory contains calculated centroids by the cluster analysis in each cluster number. The first column in each file shows the grain type. The "result_CA_all" column shows the number of grains fall in each grain type.<br>/results/labeled_data This directory contains grain type-labeled ("hclust.label" column) Morphologi data for each sample and for each grain type number.