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Blanco, M. J.
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Blanco, M. J.
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- PublicationOpen AccessCrustal and upper mantle velocity structure of Southern Iberia, the sea of Alboran, and the Gibraltar arc determined by local earthquake tomography(1997-01)
; ; ; ;Gurria, E.; Instituto Geografico Nacional, Madrid, Spain ;Mezcua, J.; Instituto Geografico Nacional, Madrid, Spain ;Blanco, M. J.; nstituto Geografico Nacional, Santa Cruz de Tenerife, Spain; ; A "local earthquake tomography" of a large area encompassing the South of Iberia, the sea of Alboran, the Gibraltar arc, and Northern Morrocco, has been performed using first arrival times recorded at various Spanish and Morroccan seismic networks. A total of 52 stations and 639 earthquakes provided over 6300 first P arrivals and 4400 S arrivals. Three features of interest appear in the results: i) a continuous low velocity structure which correlates with the Betics, the Gibraltar arc and the Rif; ii) a high velocity feature which persists to a depth of approximately 30 km, positioned near the coast of Malaga on the northern margin of the Alboran sea; iii) a low velocity feature, extending to a minimum depth of approximately 40 km, which coincides with the Granada basin and a strong negative Bouguer gravity anomaly.153 1056 - PublicationRestrictedHydrothermal system of Central Tenerife Volcanic Complex, Canary Islands (Spain), inferred from self-potential measurements.(2014)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Villasante-Marcos, V.; Instituto Geográfico Nacional, Spain ;Finizola, A. ;Abella, R. ;Barde-Cabusson, S. ;Blanco, M. J. ;Brenes, B. ;Cabrera, V. ;Casas, B. ;De Agustín, P. ;Di Gangi, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Domínguez, I. ;García, O. ;Gomis, A. ;Guzmán, I. ;Iribarren, I. ;Levieux, G. ;López, C. ;Luengo, N. ;Martín, I. ;Moreno, M. ;Meletlidis, S. ;Morin, J. ;Moure, D. ;Pereda, J. ;Ricci, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Romero, E. ;Schütze, C. ;Suski-Ricci, B. ;Torres, P. ;Trigo, P.; ; ; ; ; ; ; ; ;; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ;An extensive self-potential survey was carried out in the central volcanic complex of Tenerife Island (Canary Islands, Spain). A total amount of ~237 kmof profileswith 20 mspacing betweenmeasurementswas completed, including radial profiles extending from the summits of Teide and Pico Viejo, and circular profiles inside and around Las Cañadas caldera and the northern slopes of Teide and Pico Viejo. One of themain results of this mapping is the detection ofwell-developed hydrothermal systemswithin the edifices of Teide and Pico Viejo, and also associated with the flank satellite M. Blanca and M. Rajada volcanoes. A strong structural control of the surface manifestation of these hydrothermal systems is deduced from the data, pointing to the subdivision of Teide and Pico Viejo hydrothermal systems in three zones: summit crater, upper and lower hydrothermal systems. Self-potential maxima related to hydrothermal activity are absent from the proximal parts of the NE and NW rift zones as well as from at least two of the mafic historical eruptions (Chinyero and Siete Fuentes), indicating that long-lived hydrothermal systems have developed exclusively over relatively shallow felsic magma reservoirs. Towards Las Cañadas caldera floor and walls, the influence of the central hydrothermal systems disappears and the self-potential signal is controlled by the topography, the distance to thewater table of Las Cañadas aquifer and its geometry. Nevertheless, fossil or remanent hydrothermal activity at some points along the Caldera wall, especially around the Roques de García area, is also suggested by the data. Self-potential data indicate the existence of independent groundwater systems in the three calderas of Ucanca, Guajara and Diego Hernández, with a funnel shaped negative anomaly in the Diego Hernández caldera floor related to the subsurface topography of the caldera bottom. Two other important self-potential features are detected: positive values towards the northwestern Santiago rift, possibly due to the relatively high altitude of the water-table in this area; and a linear set ofminima to thewest of Pico Viejo, aligned with the northwestern rift and related to meteoricwater infiltration along its fracture system.378 75