Calculating Velocity Models and Solving Seismic Inversion Problems Using Physics-Informed Neural Networks

Authors

Shahrood University of Technology

Abstract

Traditional numerical and gradient-based methods for solving seismic inversion problems face challenges such as the need for an initial velocity model and the risk of getting trapped in local minima. In this study, Physics-Informed Neural Networks (PINNs) are employed to solve the two-dimensional acoustic wave equation and perform full waveform inversion (FWI). In recent years, deep learning has brought significant advancements across various fields, especially in geosciences and seismology. Conventional neural network-based methods often rely solely on available data and tend to overlook the role of scientific knowledge in the training process. To address this limitation, Physics-Informed Neural Networks have been introduced as a novel approach that integrates physical laws into the machine learning framework, thereby overcoming many of the shortcomings of traditional methods. Key advantages of this approach include reduced dependence on large volumes of training data and improved interpretability of deep learning models. In this study, PINNs are utilized to solve the 2D acoustic wave equation and perform full waveform inversion. The resulting velocity model is compared with that obtained from physics-agnostic neural networks to assess the accuracy and effectiveness of the proposed method. The results demonstrate that employing physics-informed neural networks not only mitigates existing challenges but also outperforms classical numerical techniques and physics-agnostic neural networks. By leveraging physical principles, this approach reduces the reliance on labeled data and enhances the accuracy and reliability of seismic inversion models.

Keywords


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