Articles | Volume 13, issue 8
Research article
04 Aug 2022
Research article |  | 04 Aug 2022

Multi-array analysis of volcano-seismic signals at Fogo and Brava, Cape Verde

Carola Leva, Georg Rümpker, and Ingo Wölbern

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Subject area: The evolving Earth surface | Editorial team: Seismics, seismology, paleoseismology, geoelectrics, and electromagnetics | Discipline: Seismology
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Cited articles

Almendros, J., Ibáñez, J. M., Alguacil, G., Morales, J., Del Pezzo, E., La Rocca, M., Ortiz, R., Araña, V., and Blanco, M. J.: A double seismic antenna experiment at teide Volcano: existence of local seismicity and lack of evidences of Volcanic tremor, J. Volcanol. Geoth. Res., 103, 439–462,, 2000. 
Almendros, J., Chouet, B., and Dawson, P.: Spatial extent of a hydrothermal system at Kilauea Volcano, Hawaii, determined from array analyses of shallow long-period seismicity: 1. Method, J. Geophys. Res., 106, 13565–13580,, 2001a. 
Almendros, J., Chouet, B., and Dawson, P.: Spatial extent of a hydrothermal system at Kilauea Volcano, Hawaii, determined from array analyses of shallow long-period seismicity: 2. Results, J. Geophys. Res., 106, 13581–13597,, 2001b. 
Almendros, J., Chouet, B., Dawson, P., and Huber, C.: Mapping the Sources of the Seismic Wave Field at Kilauea Volcano, Hawaii, Using Data Recorded on Multiple Seismic Antennas, B. Seismol. Soc. Am., 92, 2333–2351,, 2002. 
Almendros, J., Ibáñez, J. M., Carmona, E., and Zandomeneghi, D.: Array analyses of volcanic earthquakes and tremor recorded at Las Cañadas caldera (Tenerife Island, Spain) during the 2004 seismic activation of Teide volcano, J. Volcanol. Geoth. Res., 160, 285–299,, 2007. 
Short summary
The seismicity of Fogo and Brava, Cape Verde, is dominated by volcano-tectonic earthquakes in the area of Brava and volcanic seismic signals, such as hybrid events, on Fogo. We locate these events using a multi-array analysis, which allows the localization of seismic events occurring outside the network and of volcanic signals lacking clear phases. We observe exceptionally high apparent velocities for the hybrid events located on Fogo. These velocities are likely caused by a complex ray path.