689 ANNALS OF GEOPHYSICS, VOL. 50, N. 5, October 2007 Key words magnetic anomalies – Tenerife – Teide volcano – aeromagnetism – potential fields 1. Introduction The Canaries are a group of seven volcanic islands located in the eastern central Atlantic near the African coast. Tenerife is the largest is- land of the archipelago and represents the emerged portion of a huge volcanic edifice that rises about 7 km from the seafloor. The oldest subaerial materials of Tenerife correspond to the shield basaltic stage with an age of about 12 Ma (Guillou et al., 2004). In the central part of the Tenerife, the Teide-Pico Viejo volcanic complex with an age of about 180 ky and the maximum topographic height of 3718 m represents the most recent phase of activity. This composite stratovolcano was constructed inside the Ca- ñadas caldera (fig. 1) that has been variously at- tributed to multiple collapses and landslides (i.e. Carracedo, 1994; Watts and Masson, 1995; An- cochea et al., 1999; Martí and Gudmundsson, 2000). Our knowledge of the geological properties and evolution of Tenerife improved significant- ly as the result of an international effort to study the Teide volcano from a multidisciplinary per- spective. 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 Ca- nary archipelago in 1993. Over Tenerife, the survey mapped lines at the spacing of 2500 m in the N-S direction at a constant altitude of 3200 m, except over the central part of the is- High resolution aeromagnetic anomaly map of Tenerife, Canary Islands Alicia García ( 1 ), Massimo Chiappini ( 2 ), Isabel Blanco-Montenegro ( 3 ), Roberto Carluccio ( 2 ), Francesca D’Ajello Caracciolo ( 2 ), Riccardo De Ritis ( 2 ), Iacopo Nicolosi ( 2 ), Alessandro Pignatelli ( 2 ), Nieves Sánchez ( 1 ) and Enzo Boschi ( 2 ) ( 1 ) Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain ( 2 ) Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy ( 3 ) Departamento de Física, Universidad de Burgos, Spain Abstract This study presents magnetic anomaly data from a new high-resolution, low-altitude helicopter-borne magnetic sur- vey recently collected on and offshore Tenerife in the Canary Archipelago. The Italian Istituto Nazionale di Geofisi- ca 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 to- tal 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 de- tails, especially over Las Cañadas caldera and Teide-Pico Viejo complex in the central part of the island. A good correlation is evident between known geological structures and the magnetic anomalies, where the new shorter wavelength anomalies facilitate more detailed and comprehensive geological interpretations. Mailing address: Dr. Massimo Chiappini, Istituto Nazio- nale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy; e-mail: massimo.chiappini@ingv.it