Abstract
This study presents magnetic anomaly data from a new high-resolution, low-altitude helicopter-borne magnetic survey recently collected on and offshore Tenerife in the Canary Archipelago. The Italian Istituto Nazionale di Geofisica e Vulcanologia (INGV) in collaboration with the Museo Nacional de Ciencias Naturales of the CSIC of Spain conducted the survey in 2006. The data for Tenerife and surrounding marine areas were processed into digital total intensity magnetic anomalies for geomagnetic epoch 2006.4. Relative to previously available higher altitude magnetic survey data, the new survey mapped higher resolution anomalies with significantly improved spatial details, especially over the Las Canadas caldera and Teide-Pico Viejo complex in the central part of the island. A good correlation is evident between known structural geology and the magnetic anomalies, where the new shorter wavelength anomalies facilitate more detailed and comprehensive geologic interpretations.
Highlights
The Canaries are a group of seven volcanic islands located in the eastern central Atlantic near the African coast
Tenerife is the largest island of the archipelago and represents the emerged portion of a huge volcanic edifice that rises about 7 km from the seafloor
Since 1992, the European Union has investigated Tenerife as one of its six European Laboratory Volcanoes. As part of this effort, the Spanish Instituto Geográfico Nacional carried out a regional aeromagnetic survey of the Canary archipelago in 1993
Summary
The Canaries are a group of seven volcanic islands located in the eastern central Atlantic near the African coast. Land where the flight height was 3800 m above sea level (a.s.l.) (Socías and Mézcua, 1996) This aeromagnetic survey effectively sampled the larger scale features of the volcanic edifice and provided a magnetic image of Tenerife at the constant altitude of 3800 m. Analysis of microgravity data suggests that magma may be recharging beneath the northwestern rift zone of Tenerife and reawakening the volcano (Gottsmann et al, 2006) This reactivation evidence has resulted in the call for the scientific community to collect new data on the subsurface properties of Tenerife. High-resolution, low-altitude aeromagnetic surveys, in particular, have considerable utility in studies of active volcanoes (e.g., Lénat et al, 2001; De Ritis et al, 2005; Blanco-Montenegro et al, 2007; De Ritis et al, 2007) This surveying identifies high-frequency magnetic anomalies that map distributions of outcropping or buried intrusions, vents, faults, and other volcanic features. We describe the acquisition, processing, and analysis of these new state-of-the-art helicopter survey data
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