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Open AccessReview

Periodicity in Volcanic Gas Plumes: A Review and Analysis

1
Department of Geography, University of Sheffield, Sheffield S10 2TN, UK
2
Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
3
Department of Earth Sciences, University College London, London WC1E 6BS, UK
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(9), 394; https://doi.org/10.3390/geosciences9090394
Received: 18 July 2019 / Revised: 2 September 2019 / Accepted: 4 September 2019 / Published: 10 September 2019
Persistent non-explosive passive degassing is a common characteristic of active volcanoes. Distinct periodic components in measurable parameters of gas release have been widely identified over timescales ranging from seconds to months. The development and implementation of high temporal resolution gas measurement techniques now enables the robust quantification of high frequency processes operating on timescales comparable to those detectable in geophysical datasets. This review presents an overview of the current state of understanding regarding periodic volcanic degassing, and evaluates the methods available for detecting periodicity, e.g., autocorrelation, variations of the Fast Fourier Transform (FFT), and the continuous wavelet transform (CWT). Periodicities in volcanic degassing from published studies were summarised and statistically analysed together with analyses of literature-derived datasets where periodicity had not previously been investigated. Finally, an overview of current knowledge on drivers of periodicity was presented and discussed in the framework of four main generating categories, including: (1) non-volcanic (e.g., atmospheric or tidally generated); (2) gas-driven, shallow conduit processes; (3) magma movement, intermediate to shallow storage zone; and (4) deep magmatic processes. View Full-Text
Keywords: volcanic plumes; periodicity; basaltic volcanism; passive degassing; fluid dynamics volcanic plumes; periodicity; basaltic volcanism; passive degassing; fluid dynamics
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MDPI and ACS Style

Pering, T.D.; Ilanko, T.; Liu, E.J. Periodicity in Volcanic Gas Plumes: A Review and Analysis. Geosciences 2019, 9, 394.

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