Marine magnetic anomaly data from high resolution surveys off the SW Portuguese coast

This dataset contains magnetic anomaly grids that result from the full processing of marine magnetic data collected off the SW Portuguese coast between 2014 and 2019. A total area of ~4400 km2 was surveyed with average line spacing of 1 nautic mile. Surveys covered the continental shelf and in some regions reaching up to 2500 m bathymetric levels. Total magnetic field data were acquired with a G882 Cesium vapor marine magnetometer towed, towed at sea surface.

Full processing of magnetic data included: layback correction; noise removal; IGRF subtraction; base station correction; line leveling; minimum curvature gridding. The resulting sea level magnetic anomaly grid was further processed for upward continuation and reduction to the pole, providing additional outputs. 

The following grids are provided in georeferenced geotiff format:

Magnetic anomaly (sealevel)

Magnetic anomaly reduced to the pole (sealevel)

Magnetic anomaly upward continued to 200 m height 

Magnetic anomaly upward continued to 200 m height, reduced to the pole

Magnetic anomaly upward continued to 3000 m height 

Magnetic anomaly upward continued to 3000 m height, reduced to the pole

Published in: Neres, M., P. Terrinha, J. Noiva, P. Brito, M. Rosa, L. Batista, C. Ribeiro (2023). New Late Cretaceous and CAMP magmatic sources off West Iberia, from high-resolution magnetic surveys on the continental shelf. Tectonics. doi: 10.1029/2022TC007637