Geochemical evidences of seismo-volcanic unrests at the NW rift zone of Tenerife, Canary Islands, inferred from diffuse CO2 emission

Hernández, Pedro A.; Padilla, Germán D.; Barrancos, José; Melián, Gladys V.; Padrón, Eleazar; Asensio-Ramos, María; Rodríguez, Fátima; Pérez, Nemesio M.; Alonso, Mar; Calvo, David

doi:10.1007/s00445-017-1109-9

Cited by 14 publications

(6 citation statements)

References 57 publications

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“…), the diffuse gas emission is the dominant degassing mechanism (Hernández et al, 1998). Diffuse degassing of volcanic origin has been measured in different areas of interest in Tenerife and has been related with the dynamics of the volcanic system (Hernández et al, 2017;Pérez et al, 2013). Since 1999, time series of CO 2 emission from the Teide crater are available in the literature (Melián et al, 2012).…”

Section: 1029/2019jb017871mentioning

confidence: 99%

The 2016 Tenerife (Canary Islands) Long‐Period Seismic Swarm

et al. 2019

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On 2 October 2016, a significant seismic swarm of long‐period events was recorded on Tenerife (Canary Islands, Spain). The swarm lasted more than 5 hr and consisted of at least 766 detected events. We found a positive correlation between the amplitude of each event and the preceding interevent time together with a stability of the spectral properties and waveform similarity during most of the swarm duration. Toward the end of the swarm, individual events merged into a continuous tremor. These observations can be explained by postulating an unsteady transonic choked flow within a crack‐like conduit as a source mechanism for this swarm. The flow resulted from a sudden discharge of magmatic fluids from a pressurized reservoir into the hydrothermal system of Tenerife. The injected fluids reached the surface starting about 1 month after the swarm, as evidenced by the macroscopic increase in the diffuse CO2 emissions from the crater of Teide volcano. The lack of ground deformation and the absence of relevant seismicity at depths greater than 10 km exclude the ascent of a basaltic magma batch as a causative source mechanism. Instead, we hypothesize the sudden release of fluids accumulated at the top of a magma chamber as a possible mechanism. Another possibility is the injection of a small batch of mafic magma into a cooling magma chamber, triggering a convective mixing. Both cases imply the presence of a magma chamber at depths greater than 8.6 km. These results have important implications for the development of the volcano monitoring system of Tenerife.

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Section: 1029/2019jb017871mentioning

confidence: 99%

The 2016 Tenerife (Canary Islands) Long‐Period Seismic Swarm

et al. 2019

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“…Thermal leads geodetic with positive correlation: volatile release at depth. A positive lag (thermal leads InSAR) with positive correlation could imply a bottom-up process controlled by deep CO 2 release from magma rising from the mantle 40,41 . Carbon dioxide exsolves at high pressures and percolates towards the surface in the early stages of magma migration and reactivation 39 .…”

Section: Discussionmentioning

confidence: 99%

The dynamics of large silicic systems from satellite remote sensing observations: the intriguing case of Domuyo volcano, Argentina

Lundgren

Girona

Bato

et al. 2020

Sci Rep

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Silicic magmatic systems are the most dangerous volcanoes on Earth, capable of large and catastrophic eruptions, yet their low eruptive frequency makes it challenging to interpret their short-term unrest. Here we present a decade-plus analysis that integrates, for the first time, time series of satellite interferometric synthetic aperture radar (InSAR) surface deformation and satellite thermal infrared edifice-scale surface warming at a large silicic system: Domuyo volcano, in Argentina. We find that deformation and warming are highly correlated, and depending on the sign and lag between the time series, either shallow sealing or magma influx could drive Domuyo’s ongoing inflation (~ 0.15 m/year; from an InSAR-derived tabular source, ~ 11 × 8 × 1 km; ~ 6.5 km depth; ~ 0.037 km 3 /year volume-change rate) and warming (0.3–0.4 °C/year). This study shows the potential that combined satellite surface deformation and edifice-scale surface warming time series have on assessing the physical mechanisms of silicic volcanic systems and for constraining deterministic models.

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“…This concurrence put us in the most favorable conditions to study the relationship between tectonic and soil CO 2 flux. Actually, it was observed that release of soil CO 2 can increase in response to tectonic stress related to the seismic activity [Padilla et al, 2014;Werner et al, 2014;Camarda et al, 2016;Hernández et al, 2017;Camarda et al 2019]. Due to the limited length of the profile, we have been able to carry out the measurements in the same type of soils with homogeneous vegetation.…”

Section: Artificial Basin Of the Garcia Dammentioning

confidence: 99%

Relationship between soil CO2 flux and tectonic structures in SW Sicily

Camarda

Gregorio

Favara

et al. 2020

Annals of Geophysics

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The identification and characterization of seismogenic structures in southwestern Sicily is an open debate both for the geological-structural complexity of this sector and the scarce seismicity as well. In addition, clear morphological evidence of tectonic structures is limited. Besides the geophysical methods, the study of the spatial distribution of soil CO 2 flux is a valid methodology to investigate the position and geometry of buried active faults. Indeed, active tectonic structures are channels with high permeability through which deep fluids can migrate toward the atmosphere. Therefore, the alignment of high degassing areas can reveal the presence of preferential ways of rising fluids (i.e. faults). We applied this methodology in SW Sicily in the surrounding of the area hit by the 1968 seismic sequence and in three other areas where evidence of active deformation has been recognized. Furthermore, to investigate the origin of emitted fluids, we measured the carbon isotopic composition of the soil CO 2 in some high emission sites. The results showed high spatial variability of soil CO 2 fluxes with values ranging from 1 to 430 g m −2 d −1. The areal patterns of soil CO 2 fluxes in all the areas reveal a strong influence of the main tectonic structures and active deformations on soil CO 2 emissions. The range of isotopic data and the distribution of soil CO 2 fluxes suggest a supply of deep fluids through the active tectonic structures.

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Geochemical evidences of seismo-volcanic unrests at the NW rift zone of Tenerife, Canary Islands, inferred from diffuse CO2 emission

Cited by 14 publications

References 57 publications

The 2016 Tenerife (Canary Islands) Long‐Period Seismic Swarm

The 2016 Tenerife (Canary Islands) Long‐Period Seismic Swarm

The dynamics of large silicic systems from satellite remote sensing observations: the intriguing case of Domuyo volcano, Argentina

Relationship between soil CO2 flux and tectonic structures in SW Sicily

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