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  Wavefield analysis of volcanic tremor during the 2021 eruption of La Palma, Canary Islands, using multiple seismic arrays

Almendros, J., Abella, R., Melchor, I., Cabrera, I., Serrano, I., Morales, J., Carmona, E., Martin-Leon, R., Tubio, R., Prudencio, J., Moreno, J., Martos, A., Martin-Martinez, B., Seivane, H., Feriche, M., Ontiveros, A., Moleon, J. A. (2023): Wavefield analysis of volcanic tremor during the 2021 eruption of La Palma, Canary Islands, using multiple seismic arrays, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3562

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020304 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020304_1
Genre: Conference Paper

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 Creators:
Almendros, Javier1, Author
Abella, Rafael1, Author
Melchor, Ivan1, Author
Cabrera, Ivan1, Author
Serrano, Inmaculada1, Author
Morales, Jose1, Author
Carmona, Enrique1, Author
Martin-Leon, Rosa1, Author
Tubio, Rafael1, Author
Prudencio, Janire1, Author
Moreno, Javier1, Author
Martos, Antonio1, Author
Martin-Martinez, Benito1, Author
Seivane, Helena1, Author
Feriche, Mercedes1, Author
Ontiveros, Alfonso1, Author
Moleon, Jose Alberto1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The 2021 Tajogaite eruption in La Palma, Canary Islands, was accompanied by strong volcanic tremor. In September 2021, during the first two weeks of eruption, we deployed two small-aperture seismic arrays. We chose two locations around Montaña Caldero and Llano del Jable, located about 4 km SE and 2 km NE of the eruption site. The arrays were composed of 1 three-component and 9 vertical-component short-period seismometers, sampled at 100 sps by a 12-channel data acquisition system. In each array, the receivers were spread with an aperture of about 400 m. Although they operated intermittently due to failures in the power supply related to ash fall, they provided long time series of multichannel seismic data that allow for the characterization of the syn-eruptive tremor. The analysis of the recorded wavefields reveals a persistent tremor source linked to the activity of the eruptive vents. The main component of the wavefield in the 1-3 Hz frequency band propagates with apparent slowness around 1 s/km, impinging on the arrays from directions of ~300 and 260ºN, respectively. These directions are slightly deviated from the active vents azimuths, a fact that we attribute to propagation effects produced by the topography and heterogeneous velocity structure. Subtle variations in the apparent slowness and propagation azimuths are investigated using the relative slowness estimate method, that allows for a precise determination of the apparent slowness vectors.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-3562
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -