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Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography
Abstract
The Colombian volcano Galeras is one of the most active volcanoes in the world, and it has an andesitic composition and high explosive potential. We consider the period of 1989–2015, in which the volcano manifested frequent eruptions and high seismic activity. To study the temporal variations in the seismic structure beneath Galeras, we implemented an algorithm of repeated tomography using selected data sets with similar geometries. We obtained the variations in the seismic velocity structures beneath Galeras during the three time episodes of 1989–2000, 2001–2007, and 2008–2015. In the second episode, we observe a columnar anomaly with a high Vp/Vs ratio that possibly represents a conduit transporting a new portion of magma material from below. This result may indicate that in this period, which culminated with dome emplacement and collapse, the volcano was directly fed from deeper magma sources. In other episodes, the conduit is less visible in the tomography models, and we propose that the volcanic activity was merely controlled by shallow magma reservoirs at 2–4 km below the surface.
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“The utility of repeat travel time tomography has been demonstrated in some settings, where changes in the V P /V S ratio can be observed (Koulakov and others, 2013;Koulakov and Vargas, 2018).”
From Seismic techniques and suggested instrumentation to monitor volcanoes (2024) · cites this paper as Koulakov and Vargas, 2018
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Cited by
Seismic techniques and suggested instrumentation to monitor volcanoes
Thelen, W. A., Lyons, J. J., Wech, A. G., Moran, S. C., Haney, M. M., & Flinders, A. F. (2024) · Scientific Investigations Report · doi:10.3133/sir20245062b · Cited by 4
Metadata
- Authors
- Koulakov, I., & Vargas, C. A.
- Affiliations
- SB RAS Trofimuk Institute of Petroleum Geology and Geophysics Novosibirsk Russia
- Department of Geosciences, Ciudad Universitaria Universidad Nacional de Colombia Bogota Colombia
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2018-08-11
- Volume
- 45
- Issue
- 15
- Pages
- 7514-7522
- ISSN
- 0094-8276
- 1944-8007
- Cited by
- 21
- References
- 0
- Language
- en
- Funders
- Departamento Administrativo de Ciencia, Tecnología e Innovación (FP44842‐006‐2016)
- Russian Foundation for Basic Research (16‐05‐00477)
- Russian Science Foundation (14‐17‐00430)
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- Koulakov, I., & Vargas, C. A. (2018). Evolution of the Magma Conduit Beneath the Galeras Volcano Inferred From Repeated Seismic Tomography. Geophysical Research Letters. https://doi.org/10.1029/2018gl078850
