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Abstract:
The last version of the World Digital Magnetic Anomaly Map (WDMAM v. 2.0) was released in 2015 (Dyment et al., EPSL, 2015; Lesur et al., EPS, 2016) with the mandate to update it using the same methodology when new data become available. The new version 2.1, compiled at 5 km interval, at 5 km altitude above the continents and at sea-level over the oceans, includes new datasets: (1) the complete digital aeromagnetic map of Brasil made available by ANP; (2) an improved version of the aeromagnetic map of Russia prepared by V-SEGEI; (3) the second version of the Antarctic Digital Magnetic Anomaly maP (ADMAP; Golynsky et al., GRL, 2018) which results from a remarkable international effort during and after the Second International Polar Year; (4) a new map of the Caribbean Plate and Gulf of Mexico (Garcia and Dyment, EPSL, 2021, 2022); (5) the updated Magnetic Anomaly Map of Eastern Asia prepared by the CCOP (MAMEA; Ishihara and Uchida, 2021); and (6) a new marine magnetic anomaly data compilation prepared by T. Ishihara and coworkers. The remaining data gaps are filled with a satellite anomaly model (Thebault et al., GRL, 2021). Long wavelengths of degree and order lower than 120 are filtered and replaced by those computed between order and degree 16 and 120 using the same satellite magnetic anomaly model from CHAMP and Swarm data. The new map will be presented and its significant improvements over the previous version discussed.
