Moho depth structure of the eastern part of the Pyrenean belt derived from gravity data

This paper proposes a new and updated interpretation of the gravity map of the eastern part of the Pyrenean belt based on the well-established correlation existing between gravity anomalies and crustal structure. A new set of gravity data, collected over the past few years by the University of Barcelona both for academic purposes and hydrocarbon exploration, have been merged with the data previously available. First a quantitative interpretation of the crustʹs thickness has been estimated by establishing a local empirical relationship between Bouguer anomaly and the Moho depth calculated from deep seismic refraction and reflection profiles. Then, a spectral analysis of the radial wavenumber of the Bouguer anomaly values using the FFT and a 3D inversion has been performed. Finally, a 2 D density model from a SE–NW gravity profile linking the southern edge of the coastline with the northern part of the ECORS–Pyrenean profile was also established.