Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina
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 experime...
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todo:paper_03770273_v174_n4_p284_Ibanez2023-10-03T15:31:20Z Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina Ibáñez, J.M. Del Pezzo, E. Bengoa, C. Caselli, A. Badi, G. Almendros, J. 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 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. Fil:Bengoa, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Caselli, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03770273_v174_n4_p284_Ibanez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Ibáñez, J.M. Del Pezzo, E. Bengoa, C. Caselli, A. Badi, G. Almendros, J. |
| author_facet |
Ibáñez, J.M. Del Pezzo, E. Bengoa, C. Caselli, A. Badi, G. Almendros, J. |
| author_sort |
Ibáñez, J.M. |
| title |
Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina |
| title_short |
Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina |
| title_full |
Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina |
| title_fullStr |
Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina |
| title_full_unstemmed |
Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina |
| title_sort |
volcanic tremor and local earthquakes at copahue volcanic complex, southern andes, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_03770273_v174_n4_p284_Ibanez |
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