Powell Basin is a small oceanic basin bounded by continental blocks that fragmented during the break up of Antarctica from South America. This basin has been extensively studied using a variety of geophysical methods including seismic, gravity and magnetics surveys intended to unveil the tectonic domains. Nevertheless, the particularities of its magnetic anomalies and the understanding of the thermal regime in this area are still poorly understood. After performing a study that analyzes different geophysical information (Catalán et al., 2023) which aims to understand its thermal regime from a magnetic perspective, we include grids in this data repository which provide the following information regarding Powell Basin:• A Magnetic anomaly grid at sea level. • A Complete Bouguer gravity anomaly at sea level.• A 3D geometry of the Moho's undulating boundary.• A Low-pass (5 to 100 km) filtered crustal magnetization amplitude map.The magnetic anomaly map has a 5 km resolution. This map is the result of merging data from different sources. Mainly they came from a compilation of marine magnetic anomalies (Quesnel et al., 2009) which served as the basis for producing the second version of the World Digital Magnetic Anomaly Map (Lesur et al., 2016). Additionally, we have used data from eight Spanish marine surveys carried out on board R/V "Hespérides" between 1992 and 2013, and data acquired during the "ElGeoPoweR" cruise aboard R/V "Sarmiento de Gamboa" (January 2022). Internal and external field contributions were removed from the data. To reduce inconsistencies between lines we have leveled the entire database. Complete Bouguer gravity anomalies were calculated following Nettleton (1976) procedure. We have removed the water slab and seafloor topography gravity contribution and applied terrain corrections. Further details regarding gravity data treatment are included in Catalán et al. (2020). Finally, we obtained a Complete Bouguer anomaly grid with a 2 km resolution. To derive the Moho's undulating boundary (MUB) we used observed gravity data by gravity inversion we followed Chávez et al. (2007) and used the complete Bouguer anomaly map for this purpose. For the inversion process to estimate the MUB we used the LithoFLEX software (Braitenberg et al., 2007). Regarding the Low-pass (5 to 100 km) filtered crustal magnetization amplitude map, we have used the three-dimensional inversion method of Parker and Huestis (1974). The upper boundary is defined by the topography of the ocean floor, and the lower boundary is located 500 m below this topography. To ensure the convergence of the inversion we have used a band-pass filter with upper and lower cut-off wavelengths set at 100 km and 5 km, respectively. This allows to resolve of short wavelength signals that correspond to the most superficial part. To appreciate more clearly the distribution of the variation of the equivalent magnetization, we obtained a grid that results from considering the absolute value only of the short wavelength magnetization map. For further technical details concerning data acquisition and data treatment please refer to Catalán et al. (2023).