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Geosciences 2018, 8(12), 457; https://doi.org/10.3390/geosciences8120457

Cyclic Behavior Associated with the Degassing Process at the Shallow Submarine Volcano Tagoro, Canary Islands, Spain

1
Instituto Español de Oceanografía, Centro Oceanográfico de Canarias, Santa Cruz de Tenerife 38180, Spain
2
Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
3
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, 29640 Málaga, Spain
4
Instituto Español de Oceanografía, Centro Oceanográfico de Cádiz, 11006 Cádiz, Spain
*
Author to whom correspondence should be addressed.
Received: 17 October 2018 / Revised: 20 November 2018 / Accepted: 29 November 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Submarine Volcanic Hazards: Ancient and Modern Perspectives)
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Abstract

Tagoro, the most recently discovered shallow submarine volcano on the Canary Islands archipelago, Spain, has been studied from the beginning of its eruptive phase in October 2011 until November 2018. In March 2012, it became an active hydrothermal system involving a release of heat and gases that produce significant physical–chemical anomalies in the surrounding waters close to the seabed. Fast Fourier transform (FFT) and wavelet time-domain-frequency analysis techniques applied to filtered time series of temperature, salinity, pressure, pH, and oxidation-reduction potential (ORP) data from a conductivity-temperature-depth (CTD) device mounted on a mooring and deployed at the deepest part of the main crater at a depth of 127 m, have been used to better understand the dynamic processes of the emissions during Tagoro’s degasification phase. Our results highlight that the hydrothermal system exhibited a stationary cyclic degassing behavior with a strong peak of a 140-min period centered on a significant interval of 130–170 min at 99.9% confidence. Moreover, important physical–chemical anomalies are still present in the interior of the main crater, such as: (i) thermal increase of +2.55 °C, (ii) salinity decrease of −1.02, (iii) density decrease of −1.43 (kg∙m−3), and (iv) pH decrease of −1.25 units. This confirms that, five years after its origin, the submarine volcano Tagoro is still actively in a degassing phase. View Full-Text
Keywords: hydrothermal vents; cyclic behavior; submarine volcano; Tagoro; El Hierro hydrothermal vents; cyclic behavior; submarine volcano; Tagoro; El Hierro
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Fraile-Nuez, E.; Santana-Casiano, J.M.; González-Dávila, M.; Vázquez, J.T.; Fernández-Salas, L.M.; Sánchez-Guillamón, O.; Palomino, D.; Presas-Navarro, C. Cyclic Behavior Associated with the Degassing Process at the Shallow Submarine Volcano Tagoro, Canary Islands, Spain. Geosciences 2018, 8, 457.

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