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Relatively short-term correlation among deformation, degassing, and seismicity: a case study from Concepcion volcano, Nicaragua
- Saballos, J. A. (author)
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- Conde Jacobo, Alexander Vladimir, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Malservisi, R. (author)
- University of South Florida
- show more...
- Alvarez, J. (author)
- Munoz, A. (author)
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- (creator_code:org_t)
- 2014-07-04
- 2014
- English.
- In: Bulletin of Volcanology. - : Springer Science and Business Media LLC. - 0258-8900 .- 1432-0819. ; 76:8, s. 1-11
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Concepcion is a frequently active composite volcano in Nicaragua, and is located on Ometepe Island, within Lake Nicaragua. Significant eruptive activity took place at this volcano between March and May 2010, consisting of ash and gas explosions (VEI 1-2). We compare geodetic baseline changes observed with global positioning system (GPS), sulfur dioxide flux (SO2), and seismic amplitude (SAM) data collected at Concepcion during April - June, 2010, and February - April, 2011. Time series analysis reveals a remarkable correlation among the data sets during 2010, when the volcano was erupting. In contrast, the volcano was at its background level of activity in 2011 and the statistical correlation among the time series is not significant for this period. We explain the emergence of correlation among the time series during eruptive activity through modeling of the GPS data with emplacement of a magma column in an open conduit. In the model, magma rose in the conduit, between May 5 and 14, 2010, from a shallow reservoir located at similar to 1.8 km depth. Later, between May 24 and 31, 2010, the top of the magma column descended to almost 600m depth, corresponding to the cessation of eruptive activity. Thus, cross-correlation and an integrated analysis of these geophysical time series on a timescale of days helps to reveal the dynamics of the magma plumbing system operating below Concepcion volcano.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Keyword
- SO2
- Volcano deformation
- GPS
- Concepcion volcano
- Open conduit
- Time series
- Flux
- Seismic amplitude measurement
Publication and Content Type
- art (subject category)
- ref (subject category)
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