Changes in Diffuse Degassing From the Summit Crater of Teide Volcano (Tenerife, Canary Islands) Prior to the 2016 Tenerife Long‐Period Seismic Swarm. Issue 3 (12th March 2021)

• Record Type: Journal Article
• Authors: Padrón, Eleazar; Pérez, Nemesio M.; Hernández, Pedro A.; Melián, Gladys; Asensio‐Ramos, María; D'Auria, Luca; Rodríguez, Fátima; Alonso, Mar; Amonte, Cecilia; Padilla, Germán D.; Barrancos, José; Calvo, David; C. Coldwell, Beverley; Pankhurst, Matthew J.
• Is Part Of: Journal of geophysical research. Volume 126:Issue 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-12
• Subjects: geochemical precursory signals -- long‐period events -- Teide volcano -- volcanic unrest -- volcano‐hydrothermal system dynamics; Geomagnetism -- Periodicals; Geochemistry -- Periodicals; Geophysics -- Periodicals; Earth sciences -- Periodicals; 551.1
• DOI: 10.1029/2020JB020318
• Languages: English
• ISSNs: 2169-9313

Abstract

Abstract: Ground surface diffuse degassing and heat flow surveys were conducted at the summit crater of Teide volcano (Tenerife) on a roughly monthly basis from 2013 to 2017 to evaluate their degree of temporal variation and compare with seismovolcanic activity in and around Tenerife Island. We report that significant changes in survey physicochemical and chemical parameters through time were observed. Several geochemical signals record the occurrence of magmatic fluid injections in the hydrothermal system of Tenerife: during June‐August of 2016 there were increases in diffuse H2 S emission, observed relatively higher values of diffuse H2 S/CO2 He/CO2, and CO2 /CH4 degassing ratios and changes in the carbon isotopic ratio of diffuse CO2 degassing. Convective mixing within a magma reservoir triggered by an injection of fresh magma is confirmed as the most plausible scenario to explain the source of fluid injection into the hydrothermal system of Teide. Key Points: Monthly diffuse degassing survey at Teide Volcano capture volcano‐hydrothermal system dynamics before, during and after a seismic swarm The temporally decoupled behavior of different chemical species point to the arrival of a small batch of primitive magma at depth The results and other published geophysical description afford a richer understanding of the event than either dataset can accomplish alone