Long-duration seismicity and their relation to Copahue volcano unrest

dc.creatorMelchor, Iván
dc.creatorAlmendros, Javier
dc.creatorHantusch, Marcia
dc.creatorSamsonov, Sergey
dc.creatorDerauw, Dominique
dc.creatorMartínez, Enzo
dc.creatorCaselli, Alberto Tomás
dc.dateinfo:eu-repo/date/embargoEnd/2024-01-01
dc.date2022
dc.date.accessioned2023-08-30T16:50:06Z
dc.date.available2023-08-30T16:50:06Z
dc.identifierMelchor I, Almendros J, Hantusch M, Samsonov S, Derauw D, Martínez E, Caselli A. (2022). Long‑duration seismicity and their relation to Copahue volcano unrest. Earth, Planets and Space; 74 (3); 1-22.
dc.identifier1880-5981
dc.identifierhttps://earth-planets-space.springeropen.com/articles/10.1186/s40623-021-01561-7#citeas
dc.identifierhttp://rid.unrn.edu.ar/handle/20.500.12049/8404
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8538455
dc.descriptionFil: Melchor, Iván. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
dc.descriptionFil: Almendros, Javier. Instituto Andaluz de Geofísica, Universidad de Granada. España.
dc.descriptionFil: Hantusch, Marcia. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
dc.descriptionFil: Samsonov, Sergey. Canada Centre for Mapping and Earth Observations, Natural Resources Canada. Canada.
dc.descriptionFil: Derauw, Dominique. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
dc.descriptionFil: Martínez, Enzo. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
dc.descriptionFil: Caselli, Alberto. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
dc.descriptionUnderstanding seismic tremor wavefields can shed light on the complex functioning of a volcanic system and, thus, improve volcano monitoring systems. Usually, several seismic stations are required to detect, characterize, and locate volcanic tremors, which can be difficult in remote areas or low-income countries. In these cases, alternative techniques have to be used. Here, we apply a data-reduction approach based on the analysis of three-component seismic data from two co-located stations operating in different times to detect and analyze long-duration tremors. We characterize the spectral content and the polarization of 355 long-duration tremors recorded by a seismic sensor located 9.5 km SE from the active vent of Copahue volcano in the period 2012–2016 and 2018–2019. We classified them as narrow- (NB) and broad-band (BB) tremors according to their spectral content. Several parameters describe the characteristic peaks composing each NB episode: polarization degree, rectilinearity, horizontal azimuth, vertical incidence. Moreover, we propose two coefficients CP and CL for describing to what extent the wavefield is polarized. For BB episodes, we extend these attributes and express them as a function of frequency. We compare the occurrence of NB and BB episodes with the volcanic activity (including the level of the crater lake, deformation, temperature, and explosive activity) to get insights into their mechanisms. This comparison suggests that the wavefield of NB tremors becomes more linearly polarized during eruptive episodes, but does not provide any specific relationship between the tremor frequency and volcanic activity. On the other hand, BB tremors show a seasonal behavior that would be related to the activity of the shallow hydrothermal system.
dc.descriptiontrue
dc.description-
dc.formatapplication/pdf
dc.languageen
dc.publisherSpringer Open
dc.relationhttps://earth-planets-space.springeropen.com/
dc.relation74 (3)
dc.relationEarth, Planets and Space
dc.rightsinfo:eu-repo/semantics/embargoedAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subjectCiencias Exactas y Naturales
dc.subjectTremor Characterization
dc.subjectData Reduction Methods
dc.subjectNon-eruptive Tremor
dc.subjectCopahue Volcano
dc.subjectCiencias Exactas y Naturales
dc.titleLong-duration seismicity and their relation to Copahue volcano unrest


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