1 (Submitted to Journal of Volcanology and Geothermal Research, second revised manuscript, November 2018) 2 Deep volcanic morphology below Lanzarote, Canaries, 3 from gravity inversion: 4 New results for Timanfaya and implications. 5 6 Antonio G. Camacho1, Juan F. Prieto2, Eumenio Ancochea3, and José Fernández1,* 7 1 Instituto de Geociencias (CSIC, UCM). Calle del Doctor Severo Ochoa, nº 7. Facultad de 8 Medicina (Edificio Entrepabellones 7 y 8, 4ª planta). Ciudad Universitaria. 28040-Madrid, 9 Spain. 10 2 ETS de Ingenieros en Topografía, Geodesia y Cartografía, Universidad Politécnica de Madrid, 11 28031-Madrid, Spain. 12 3 Departamento de Petrología y Geoquímica, Fac. CC. Geológicas, Universidad Complutense de 13 Madrid, 28040-Madrid, Spain. 14 *Corresponding author: José Fernández (
[email protected]) 15 16 Highlights: 17 - We use published and new gravity data with an improved inversion methodology 18 - 3D density structure is determined solving the inverse gravity problem 19 - Three high-density sources are described as resulting of main volcanic complexes 20 - Timanfaya’s plumbing system is inferred as branches of magma from SW intrusive body 21 - Comparison of gravity results and geology gives different cases of correlation 1 22 Abstract. 23 The deep roots of oceanic island volcanoes are poorly known and geophysical models can help 24 to constrain processes such as magma storage and transport before and during eruptions. 25 Lanzarote, Canary Islands, is a volcanic island in post-erosional phase where, in the 18th 26 century, one of the most important historical eruptions, considering duration and volume, of the 27 Canary Islands took place in the Timanfaya area.