Vertical collapse origin of Las Cañadas caldera (Tenerife, Canary Islands) revealed by 3‐D magnetotelluric inversion

Piña-Varas, Perla; Ledo, Juanjo; Queralt, Pilar; Marcuello, Álex; Bellmunt, F.; Ogaya, Xènia; Pérez, Nemesio M.; Rodríguez-Losada, José A.

doi:10.1002/2015gl063042

Cited by 14 publications

(11 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the MT data support the vertical collapse hypothesis proposed by Martí (2004) and Martí et al (1997) to explain the origin of Las Cañadas caldera (Piña-Varas et al 2015). This study is based on the good agreement between the geological cross section proposed by Martí (2004) and the corresponding vertical cross section extracted from the 3-D resistivity model along a NW-SE profile (Fig.…”

Section: Joint Interpretation and Hypothetical Internal Structure Modelsupporting

confidence: 85%

“…On the other hand, Piña-Varas et al (2015) studied the origin of the Las Cañadas Caldera by analysing and further interoperating the MT model. Here, we consider the model presented in Piña-Varas et al (2015) (Additional file 1: Fig.…”

Section: Previous Workmentioning

confidence: 99%

“…In order to analyse each case separately, we modified the resistivity model of Piña-Varas et al (2015) by adding new structures taking into account the magma chambers proposed on these studies. Consequently, we obtain two new models: (1) PHO-1, similar to that proposed by De Barros et al (2012), consisting of a single magma chamber under the Teide (Fig.…”

Section: Shallow Phonolitic Magma Chambers: Explosive Volcanismsmentioning

confidence: 99%

“…In this work we analyse the capability of the MT dataset presented by Piña-Varas et al (2015) to detect the magma chambers below Teide volcano. To do this analysis, the 3-D resistivity model obtained in Tenerife by Piña-Varas et al (2015) has been modified by introducing low-resistivity bodies performing the role of potential magma chambers, according to geological, geophysical and petrological information.…”

Section: Introductionmentioning

confidence: 99%

“…To do this analysis, the 3-D resistivity model obtained in Tenerife by Piña-Varas et al (2015) has been modified by introducing low-resistivity bodies performing the role of potential magma chambers, according to geological, geophysical and petrological information. The variations in the data fit between the original 3-D inversion model (Piña-Varas et al 2015) and the models with these conductive bodies (modified models) will provide us information about the characteristics (e.g. size, location, depth) of the potential magma chambers compatible with the available MT data.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the detectability of Teide volcano magma chambers (Tenerife, Canary Islands) with magnetotelluric data

Piña-Varas

Ledo

Queralt

et al. 2018

Earth Planets Space

View full text Add to dashboard Cite

Tenerife has been the subject of numerous studies covering a wide range of fields. Many studies have been focused on characterising the magmatic plumbing system. Even so, a controversy still exists regarding the location and size of the current magma chambers. Several magnetotelluric (MT) surveys have been carried out in the island, but no conductivity anomalies associated with the chambers have been detected. We report the results of a set of tests conducted against the 3-D resistivity model of the island, to determine the characteristics of the detectable chambers with the MT data. The most remarkable results indicate that the MT dataset is incompatible with a large-scale mafic reservoir located at shallower depths than 8 km b.s.l. However, shallower phonolitic chambers smaller than 3 × 3 × 1 km 3 could be undetected by the existing MT sites and new data should be acquired to confirm or not their existence. This new information is essential in volcanic islands like Tenerife, since many volcanic hazards are related to the size and depth of the sources of magma. Additionally, a joint interpretation of the obtained results together with other information is summarised in a hypothetical model, allowing us to better understand the internal structure of the island.

show abstract

Section: Joint Interpretation and Hypothetical Internal Structure Modelsupporting

confidence: 85%

Section: Previous Workmentioning

confidence: 99%

Section: Shallow Phonolitic Magma Chambers: Explosive Volcanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the detectability of Teide volcano magma chambers (Tenerife, Canary Islands) with magnetotelluric data

Piña-Varas

Ledo

Queralt

et al. 2018

Earth Planets Space

View full text Add to dashboard Cite

show abstract

Improving the modeling of geomagnetically induced currents in Spain

et al. 2017

Self Cite

View full text Add to dashboard Cite

Vulnerability assessments of the risk posed by geomagnetically induced currents (GICs) to power transmission grids benefit from accurate knowledge of the geomagnetic field variations at each node of the grid, the Earth's geoelectrical structures beneath them, and the topology and relative resistances of the grid elements in the precise instant of a storm. The results of previous analyses on the threat posed by GICs to the Spanish 400 kV grid are improved in this study by resorting to different strategies to progress in the three aspects identified above. First, although at midlatitude regions the source fields are rather uniform, we have investigated the effect of their spatial changes by interpolating the field from the records of several close observatories with different techniques. Second, we have performed a magnetotelluric (MT) sounding in the vicinity of one of the transformers where GICs are measured to determine the geoelectrical structure of the Earth, and we have identified the importance of estimating the MT impedance tensor when predicting GIC, especially where the effect of lateral heterogeneities is important. Finally, a sensitivity analysis to network changes has allowed us to assess the reliability of both the information about the network topology and resistances, and the assumptions made when all the details or the network status are not available. In our case, the most essential issue to improve the coincidence between model predictions and actual observations came from the use of realistic geoelectric information involving local MT measurements.

show abstract

Scattering images from autocorrelation functions of P-wave seismic velocity images: the case of Tenerife Island (Canary Islands, Spain)

et al. 2018

View full text Add to dashboard Cite

We present a P-wave scattering image of the volcanic structures under Tenerife Island using the autocorrelation functions of P-wave vertical velocity fluctuations. We have applied a cluster analysis to total quality factor attenuation (−1) and scattering quality factor attenuation (−1) images to interpret the structures in terms of intrinsic and scattering attenuation variations on a 2D plane, corresponding to a depth of 2000 m, and check the robustness of the scattering imaging. The results show that scattering patterns are similar to total attenuation patterns in the South of the island. There are two main areas where patterns differ: at Cañadas-Teide-Pico Viejo Complex high total attenuation and average-to-low scattering values are observed. We interpret the difference as induced by intrinsic attenuation. In the Santiago Ridge Zone (SRZ) region, high scattering values correspond to average total attenuation. In our interpretation, the anomaly is induced by an extended scatterer, geometrically related to the surficial traces of Garachico and El Chinyero historical eruptions and the area of highest seismic activity during the 2004-2008 seismic crises.

show abstract

Vertical collapse origin of Las Cañadas caldera (Tenerife, Canary Islands) revealed by 3‐D magnetotelluric inversion

Cited by 14 publications

References 44 publications

On the detectability of Teide volcano magma chambers (Tenerife, Canary Islands) with magnetotelluric data

On the detectability of Teide volcano magma chambers (Tenerife, Canary Islands) with magnetotelluric data

Improving the modeling of geomagnetically induced currents in Spain

Scattering images from autocorrelation functions of P-wave seismic velocity images: the case of Tenerife Island (Canary Islands, Spain)

Contact Info

Product

Resources

About