This dataset is gravity anomaly data of the Auckland and Whangarei volcanic fields (AVF and WVF) in the northern part of North Island. The X-Y coordinate system of this dataset is NZTM, and the Longitude-Latitude coordinate system is NZGD2000. The uploader gathers this data from a series of AVF day trip fieldworks (2021 - 2023), a week-long WVF campaign (2022), correspondences with authors, and the following theses lodged in The University of Auckland's General Library: