A High-Precision Edge Detection Technique for Magnetic Anomaly Signals Based on a Self-Attention Mechanism

Haihua Ju¹gaochuan liu^2*li Wang¹zhong xia¹bo Dai¹Jian Jiao³jie Yang¹le Zhang⁴

• ¹Jiangsu Earthquake Agency, Nanjing City, China
• ²China Earthquake Networks Center, China, beijing, China
• ³Jilin University, Changchun, Hebei Province, China
• ⁴Beijing HiMag Technology Co., Ltd, China, beijing, China

Magnetic data boundary detection is a key technology in potential field data processing, providing an effective basis for the division of geological units and fault structures. It holds significant importance in geological structure analysis and mineral exploration.Deep learning methods, which can automatically capture complex magnetic anomaly features, have been widely applied in boundary detection. However, convolution-based neural networks are limited by the local receptive field of the convolution paradigm, making it difficult to effectively establish long-range dependencies. This poses a challenge for high-precision magnetic data boundary detection. Additionally, traditional loss functions fail to guide the network in effectively extracting boundary information, limiting the accuracy of boundary detection. To address these issues, this paper proposes a magnetic data boundary detection method based on a self-attention mechanism. This method fully leverages the self-attention mechanism in Transformers to effectively extract global features, allowing the model to focus on key regions within the input data, thereby enhancing its ability to recognize complex boundaries.Meanwhile, an edge-enhanced loss function is introduced to further strengthen the model's ability to extract boundary information. Synthetic experiments demonstrate that the proposed method achieves higher prediction accuracy and more precise boundary localization. Furthermore, validation using magnetic anomaly observation data from the Yushishan area in Gansu, China, confirms the reliability of the boundary detection results.