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Ibáñez, J.M.; Del Pezzo, E.; Bengoa, C.; Caselli, A.; Badi, G.; Almendros, J. "Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina" (2008) Journal of Volcanology and Geothermal Research. 174(4):284-294
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Abstract:

In the present paper we describe the results of a seismic field survey carried out at Copahue Volcano, Southern Andes, Argentina, using a small-aperture, dense seismic antenna. Copahue Volcano is an active volcano that exhibited a few phreatic eruptions in the last 20 years. The aim of this experiment was to record and classify the background seismic activity of this volcanic area, and locate the sources of local earthquakes and volcanic tremor. Data consist of several volcano-tectonic (VT) earthquakes, and many samples of back-ground seismic noise. We use both ordinary spectral, and multi-spectral techniques to measure the spectral content, and an array technique [Zero Lag Cross Correlation technique] to measure the back-azimuth and apparent slowness of the signals propagating across the array. We locate VT earthquakes using a procedure based on the estimate of slowness vector components and S-P time. VT events are located mainly along the border of the Caviahue caldera lake, positioned at the South-East of Copahue volcano, in a depth interval of 1-3 km below the surface. The background noise shows the presence of many transients with high correlation among the array stations in the frequency band centered at 2.5 Hz. These transients are superimposed to an uncorrelated background seismic signal. Array solutions for these transients show a predominant slowness vector pointing to the exploited geothermal field of "Las Maquinitas" and "Copahue Village", located about 6 km north of the array site. We interpret this coherent signal as a tremor generated by the activity of the geothermal field. © 2008 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina
Autor:Ibáñez, J.M.; Del Pezzo, E.; Bengoa, C.; Caselli, A.; Badi, G.; Almendros, J.
Filiación:Instituto Andaluz de Geofísica, Universidad de Granada, Campus de Cartuja s/n, 18071 Granada, Spain
Departamento de Física Teórica y del Cosmos, Área de Física de la Tierra, Universidad de Granada, Spain
Istituto Nazionale di Geofisica e Vulcanologia, sezione di Napoli - Osservatorio Vesuviano, Via Diocleziano, 328, 80124 Napoli, Italy
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Facultad de Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina
Palabras clave:seismic array; volcanic seismicity; volcanic tremor; volcano tectonic earthquakes; Antenna accessories; Correlation methods; Earthquakes; Frequency bands; Geothermal fields; Geothermal wells; Landforms; Microfluidics; Seismology; Transients; Vectors; (1 1 0) surface; active volcanoes; Argentina; Background noises; Coherent signaling; Cross correlation technique (CC); Elsevier (CO); Local earthquakes; Multi-spectral (MS); Phreatic; Seismic activities; Seismic field; Seismic noise; Seismic signals; Spectral contents; Uncorrelated; Vector components; Volcanic complex; Volcanic tremors; Volcanotectonic (VT) earthquakes; Volcanoes; background level; earthquake catalogue; earthquake swarm; noise; seismic survey; seismicity; tectonic setting; volcanic earthquake; volcanic eruption; Argentina; Copahue; Neuquen; South America
Año:2008
Volumen:174
Número:4
Página de inicio:284
Página de fin:294
DOI: http://dx.doi.org/10.1016/j.jvolgeores.2008.02.005
Título revista:Journal of Volcanology and Geothermal Research
Título revista abreviado:J. Volcanol. Geotherm. Res.
ISSN:03770273
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03770273_v174_n4_p284_Ibanez

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Citas:

---------- APA ----------
Ibáñez, J.M., Del Pezzo, E., Bengoa, C., Caselli, A., Badi, G. & Almendros, J. (2008) . Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina. Journal of Volcanology and Geothermal Research, 174(4), 284-294.
http://dx.doi.org/10.1016/j.jvolgeores.2008.02.005
---------- CHICAGO ----------
Ibáñez, J.M., Del Pezzo, E., Bengoa, C., Caselli, A., Badi, G., Almendros, J. "Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina" . Journal of Volcanology and Geothermal Research 174, no. 4 (2008) : 284-294.
http://dx.doi.org/10.1016/j.jvolgeores.2008.02.005
---------- MLA ----------
Ibáñez, J.M., Del Pezzo, E., Bengoa, C., Caselli, A., Badi, G., Almendros, J. "Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina" . Journal of Volcanology and Geothermal Research, vol. 174, no. 4, 2008, pp. 284-294.
http://dx.doi.org/10.1016/j.jvolgeores.2008.02.005
---------- VANCOUVER ----------
Ibáñez, J.M., Del Pezzo, E., Bengoa, C., Caselli, A., Badi, G., Almendros, J. Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina. J. Volcanol. Geotherm. Res. 2008;174(4):284-294.
http://dx.doi.org/10.1016/j.jvolgeores.2008.02.005