Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina

Ibáñez, Jesús M.; Pezzo, E. Del; Bengoa, C.; Caselli, Alberto Tomás; Badi, Gabriela; Almendros, Javier

doi:10.1016/j.jvolgeores.2008.02.005

Cited by 34 publications

(30 citation statements)

References 29 publications

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“…occurrence of volcanic seismic tremor associated with the hydrothermal systems of the Copahue-Caviahue Volcanic Complex (Ibáñez et al, 2008;Forte et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…1). The hydrothermal activity of some of these sites (Las Máquinas, Las Maquinitas and Termas de Copahue) is so intense that causes a background volcanic tremor as revealed by a seismic array analysis performed in the 2003-2005 period (Ibáñez et al, 2008). Fluids are discharged as boiling, bubbling and mud pools (up to temperatures of 96°C), fumaroles (up to 130°C at La Maquinitas I) and large areas of diffuse degassing and hot soils.…”

Section: Geological Volcanological and Hydrothermal Settingmentioning

confidence: 99%

See 1 more Smart Citation

Carbon dioxide diffuse emission and thermal energy release from hydrothermal systems at Copahue–Caviahue Volcanic Complex (Argentina)

Chiodini

Cardellini

Lamberti

et al. 2015

Journal of Volcanology and Geothermal Research

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The north-western sector of Caviahue caldera (Argentina), close to the active volcanic system of Copahue, is characterized by the presence of several hydrothermal sites that host numerous fumarolic emissions, anomalous soil diffuse degassing of CO 2 and hot soils. In March 2014, measurements of soil CO 2 fluxes in 5 of these sites (namely, Las Máquinas, Las Maquinitas I, Las Maquinitas II, Anfiteatro, and Termas de Copahue) allowed an estimation that 165 t of deeply derived CO 2 is daily released. The gas source is likely related to a relatively shallow geothermal reservoir containing a single vapor phase as also suggested by both the geochemical data from the 3 deep wells drilled in the 1980s and gas geoindicators applied to the fumarolic discharges. Gas equilibria within the H-C-O gas system indicate the presence of a large, probably unique, single phase vapor zone at 200-210°C feeding the hydrothermal manifestations of Las Máquinas, Las Maquinitas I and II and Termas de Copahue. A natural thermal release of 107 MW was computed by using CO 2 as a tracer of the original vapor phase. The magmatic signature of the incondensable fumarolic gases, the wide expanse of the hydrothermal areas and the remarkable high amount of gas and heat released by fluid expulsion seem to be compatible with an active magmatic intrusion beneath this portion of the Caviahue caldera.

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“…occurrence of volcanic seismic tremor associated with the hydrothermal systems of the Copahue-Caviahue Volcanic Complex (Ibáñez et al, 2008;Forte et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Section: Geological Volcanological and Hydrothermal Settingmentioning

confidence: 99%

Carbon dioxide diffuse emission and thermal energy release from hydrothermal systems at Copahue–Caviahue Volcanic Complex (Argentina)

Chiodini

Cardellini

Lamberti

et al. 2015

Journal of Volcanology and Geothermal Research

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“…20 to about 200), showing a higher frequency of seismic events with respect to those observed before the explosion. The geophysical investigations carried out from 2004 to 2008 (Ibañez et al 2008;Caselli et al 2009) employed a seismic array deployed equidistant from the volcano summit and the exploited geothermal field close to the village of Caviahue. That survey, being the first systematic study of the seismicity of this volcanic region, helped to determine both the rate and the energy of the seismic activity during a period of quiescence.…”

Section: Volcano Monitoringmentioning

confidence: 99%

Risk Assessment and Mitigation at Copahue Volcano

Caselli

Liccioli

Tassi

2015

Active Volcanoes of the World

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Abstract"Risk assessment" is a relatively new concept in Argentina, since the very first hazard map was only recently constructed on the basis of the 1992 eruption of Copahue volcano (Patagonia). Copahue is considered a very active volcanic system since 13 eruptive events have been recognized over the last 260 years. Most the events are phreatic and phreato-magmatic with VEI ≤ 2; nevertheless such eruptions represent a threat for the communities living in the surrounding areas of the emission centre, not only because of pyroclastic flows and tephra fall (the nearby villages, Caviahue and Copahue, have so far only experienced ash fallout), but also due to the possible formation of mud flows and flank collapse triggered by the volcanic activity. Owing to the frequent eruptions of Copahue, the most recent ones (2000, 2012) showed an increasing explosive character, hazard survey actions, such as thematic maps and contingency plans are constantly, though slowly, modified. The risk assessment described in this chapter calls for the implementation of the monitoring network in the Argentina side of the volcano, since the only currently active seismic stations (OVDAS) are located in the Chilean side of the volcanic edifice, Copahue volcano lying at the border between the two countries. Moreover, the Chilean observatory adopts criteria of alert levels, which

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“…The analysis of the seismic noise is mostly based on the estimate of the cross-correlation function between stations of seismic arrays. This approach has been applied both for detecting low-energy travelling waves and for tomography purposes; in particular, it has led to correlate modifications of rheological properties of the medium to activation of volcanic phenomena or local and teleseismic earthquakes (e.g., Friedrich et al, 1998;Obara, 2002;Shapiro and Campillo, 2004;Almendros et al, 2007;Brenguier et al, 2008;Ibañez et al, 2008;Harmon et al, 2012;Minato et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Wavefield decomposition and phase space dynamics of the seismic noise at Volcàn de Colima, Mexico: evidence of a two-state source process

Palo

Cusano

2013

Nonlin. Processes Geophys.

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Abstract. We analyse the seismic noise recorded at the Colima Volcano (Mexico) in the period December 2005-May 2006 by four broadband three-component seismic stations. Specifically, we characterize the spectral content of the signal and follow its time evolution along all the data set. Moreover, we infer the properties of the attractor in the phase space by false nearest neighbours analysis and GrassbergerProcaccia algorithm, and adopt a time-domain decomposition method (independent component analysis) to find the basic constituents (independent components) of the system. Constraints on the seismic wavefield are inferred by the polarization analysis. We find two states of the background seismicity visible in different time-intervals that are Phase A and Phase B. Phase A has a spectrum with two peaks at 0.15 Hz and 0.3 Hz, with the latter dominating, an attractor of correlation dimension close to 3, three quasi-monochromatic independent components, and a relevant fraction of craterpointing polarization solutions in the near-field. In Phase B, the spectrum is preserved but with the highest peak at 0.15 Hz, the attractor has a correlation dimension close to 2, two independent components are extracted, and the polarization solutions are dominated by Rayleigh waves incoming from the southwest direction. We depict two sources acting on the background seismicity that are the microseismic noise loading on the Pacific coastline and a low-energy volcanic tremor. A change in the amplitude of the microseismic noise can induce the switching from a state of the system to the other.

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Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina

Cited by 34 publications

References 29 publications

Carbon dioxide diffuse emission and thermal energy release from hydrothermal systems at Copahue–Caviahue Volcanic Complex (Argentina)

Carbon dioxide diffuse emission and thermal energy release from hydrothermal systems at Copahue–Caviahue Volcanic Complex (Argentina)

Risk Assessment and Mitigation at Copahue Volcano

Wavefield decomposition and phase space dynamics of the seismic noise at Volcàn de Colima, Mexico: evidence of a two-state source process

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