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| Titel |
Revisiting the statistical analysis of pyroclast density and porosity data |
| VerfasserIn |
B. Bernard, U. Kueppers, H. Ortiz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 3 ; Nr. 6, no. 3 (2015-07-24), S.869-879 |
| Datensatznummer |
250115500
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| Publikation (Nr.) |
 copernicus.org/se-6-869-2015.pdf |
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| Zusammenfassung |
| Explosive volcanic eruptions are commonly characterized based on a thorough
analysis of the generated deposits. Amongst other characteristics in
physical volcanology, density and porosity of juvenile clasts are some of
the most frequently used to constrain eruptive dynamics. In this study, we
evaluate the sensitivity of density and porosity data to statistical methods
and introduce a weighting parameter to correct issues raised by the use of
frequency analysis. Results of textural investigation can be biased by clast
selection. Using statistical tools as presented here, the meaningfulness of
a conclusion can be checked for any data set easily. This is necessary to
define whether or not a sample has met the requirements for statistical
relevance, i.e. whether a data set is large enough to allow for reproducible
results. Graphical statistics are used to describe density and porosity
distributions, similar to those used for grain-size analysis. This approach
helps with the interpretation of volcanic deposits. To illustrate this
methodology, we chose two large data sets: (1) directed blast deposits of the
3640–3510 BC eruption of Chachimbiro volcano (Ecuador) and (2) block-and-ash-flow deposits
of the 1990–1995 eruption of Unzen volcano
(Japan). We propose the incorporation of this analysis into future
investigations to check the objectivity of results achieved by different
working groups and guarantee the meaningfulness of the interpretation. |
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