报告题目 (Title)：Robust Physics-Guided Diffusion for Full-Waveform Inversion
（面向全波形反演的鲁棒物理引导扩散方法）
报告人 (Speaker)：燕雄斌（兰州大学）
报告时间 (Time)：2026年4月25日（周六）13:30-14:00
报告地点 (Place)：校本部GJ303
邀请人(Inviter)：纪丽洁
主办部门：理学院数学系
摘要：We develop a robust physics-guided diffusion framework for full-waveform inversion that combines a score-based generative prior with likelihood guidance computed through wave-equation simulations. We adopt a transport-based data-consistency potential (Wasserstein-2), incorporating wavefield enhancement via bounded weighting and observation-dependent normalization, thereby improving robustness to amplitude imbalance and time/phase misalignment. On the inference side, we introduce a preconditioned guided reverse-diffusion scheme that adapts the guidance strength and spatial scaling throughout the reverse-time dynamics, yielding a more stable and effective data-consistency guidance step than standard diffusion posterior sampling (DPS). Numerical experiments on OpenFWI datasets demonstrate improved reconstruction quality over deterministic optimization baselines and standard DPS under comparable computational budgets.
