The coupling between very long period seismic events, volcanic tremor, and degassing rates at Mount Etna volcano

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Title: The coupling between very long period seismic events, volcanic tremor, and degassing rates at Mount Etna volcano
Authors: Zuccarello, LucianoBurton, Michael R.Saccorotti, GilbertoBean, Christopher J.PatanĂ©, Domenico
Permanent link: http://hdl.handle.net/10197/5428
Date: Sep-2013
Online since: 2014-03-20T04:00:14Z
Abstract: From December 2005 to January 2006, an anomalous degassing episode was observed at Mount Etna, well-correlated with an increase in volcanic tremor, and in the almost complete absence of eruptive activity. In the same period, more than 10,000 very long period (VLP) events were detected. Through moment tensor inversion analyses of the VLP pulses, we obtained quantitative estimates of the volumetric variations associated with these events. This allowed a quantitative investigation of the relationship between VLP seismic activity, volcanic tremor, and gas emission rate at Mount Etna. We found a statistically significant positive correlation between SO2 gas flux and volcanic tremor, suggesting that tremor amplitude can be used as a first-order proxy for the background degassing activity of the volcano. VLP volumetric changes and SO2 gas flux are correlated only for the last part of our observations, following a slight change in the VLP source depth. We calculate that the gas associated with VLP signal genesis contributed less than 5% of the total gas emission. The existence of a linear correlation between VLP and degassing activities indicates a general relationship between these two processes. The effectiveness of such coupling appears to depend upon the particular location of the VLP source, suggesting that conduit geometry might play a significant role in the VLP-generating process. These results are the first report on Mount Etna of a quantitative relationship between the amounts of gas emissions directly estimated through instrumental flux measurements and the quantities of gas mass inferred in the VLP source inversion.
Type of material: Journal Article
Publisher: American Geophysical Union
Journal: Journal of Geophysical Research-Solid Earth
Volume: 118
Issue: 9
Start page: 4910
End page: 4921
Copyright (published version): 2013, American Geophysical Union
Keywords: Very long period eventsGas emissionStratovolcanobasaltic volcanoVolcanic activitySeismic measurementsGas
DOI: 10.1002/jgrb.50363
Language: en
Status of Item: Peer reviewed
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Earth Sciences Research Collection

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