Relatively short-term correlation among deformation, degassing, and seismicity: a case study from Concepción volcano, Nicaragua

被引:0
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作者
José Armando Saballos
Vladimir Conde
Rocco Malservisi
Charles B. Connor
Julio Álvarez
Angélica Muñoz
机构
[1] Instituto Nicaragüense de Estudios Territoriales,School of Geosciences
[2] Chalmers University of Technology,undefined
[3] Earth and Space Sciences,undefined
[4] University of South Florida,undefined
来源
Bulletin of Volcanology | 2014年 / 76卷
关键词
Volcano deformation; GPS; SO2; Flux; Seismic amplitude measurement; Time series; Open conduit; Concepción volcano;
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摘要
Concepción 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 Concepción 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 ∼ 1.8 km depth. Later, between May 24 and 31, 2010, the top of the magma column descended to almost 600 m 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 Concepción volcano.
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