Regional variability in the frequency and magnitude of large explosive volcanic eruptions

Sheldrake, Thomas Edward; Caricchi, Luca

doi:10.1130/G38372.1

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Title		Regional variability in the frequency and magnitude of large explosive volcanic eruptions
Authors		Sheldrake, Thomas Edward Caricchi, Luca
Published in		Geology. 2017, vol. 45, no. 2, G38372.1
Abstract		Quantifying the frequency at which volcanic eruptions of different size occurs is impor- tant for hazard assessment. Volcanic records can be used to estimate the recurrence rate of large-magnitude eruptions (magnitude ≥4), but recording biases that impact data complete- ness complicate analysis. To overcome these biases, we conceptualize the volcanic record as a series of individual and unique time series associated by a common behavior. Thus, we approach issues of completeness on a volcano-by-volcano basis and use a hierarchical Bayes- ian approach to characterize the common frequency-magnitude (f-M) behavior for different groups of volcanoes. We identify variations in the f-M relationship between different volcano types and between different volcanic arcs. By accounting for systematic under-recording in the volcanic record, we also calculate the global recurrence rates for large-magnitude erup- tions during the Holocene, which are similar to previous estimates. However, higher recur- rence rates for smaller-magnitude events are observed, which is a result of our adjustments for data completeness. Quantifying how the f-M relationship varies between different groups of volcanoes provides an opportunity to understand how the tectonic setting in uences f-M behavior, which is important to quantify long-term regional volcanic hazard.
Identifiers		DOI: 10.1130/G38372.1
Full text		Article (Published version) (539 Kb) - Free access
Structures		Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre
Research group		Petrology and Volcanology
Project		European Commission: FEVER
Citation (ISO format)		SHELDRAKE, Thomas Edward, CARICCHI, Luca. Regional variability in the frequency and magnitude of large explosive volcanic eruptions. In: Geology, 2017, vol. 45, n° 2, p. G38372.1. doi: 10.1130/G38372.1 https://archive-ouverte.unige.ch/unige:90272