Aeromagnetic and derivative gridded data, and magnetization boundaries of northeastern California

This data release contains gridded aeromagnetic data from a dataset that merges two aeromagnetic surveys of northeastern California. Data from the Alturas and Burney surveys were gridded and merged to provide a continuous, detailed aeromagnetic dataset of the region. The merged dataset was then corrected for the inclination of the Earth's magnetic field (reduced to pole or rtp); match-filtering of the merged rtp gridded dataset provides three dipole-equivalent source layers at 0.85 km (shallow), 3.28 km (medium), and 16.4 (deep) km. Magnetization boundaries were calculated using the maximum horizontal gradient method on the match-filtered gridded data. Lastly, a magnetic field caused by magnetic terrain was calculated to compare with observed magnetic field gridded values.

本数据集发布包含网格化航空磁测数据，其整合了加利福尼亚州东北部的两组航空磁测数据。阿尔图斯（Alturas）与伯尼（Burney）两项磁测工作所获数据经网格化处理与整合后，得到该区域连续且精细的航空磁测数据集。随后对整合后的数据集进行地球磁场倾角校正（化极，即RTP）；对经化极处理的网格化整合数据集开展匹配滤波，可得到三个等效偶极子源层，埋深分别为0.85千米（浅层）、3.28千米（中层）与16.4千米（深层）。基于匹配滤波后的网格化数据，采用最大水平梯度法计算得到磁化边界。最后，计算由磁性地形产生的磁场，以与实测网格化磁场数据进行对比。