Mitigating local minima in full-waveform inversion by expanding the search space

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Adaptive waveform inversion: Theory (2014, methodology): “Methods in the first group include those of van Leeuwen and Mulder (2008, 2010), Luo and Sava (2011), and perhaps Ma and Hale (2013), and methods in the second group include those of van Leeuwen and Herrmann (2013) and Biondi and Almomin (2012, 2015).”
Implicit Neural Representations with Periodic Activation Functions (2020, methodology): “Then, we optimize for the wavefields and squared slowness using a penalty method variation [54] of Eq.”
Implementing bound constraints and total-variation regularization in extended full waveform inversion with the alternating direction method of multiplier: application to large contrast media (2019, methodology): “Therefore, van Leeuwen & Herrmann (2013) implement WRI with a small preset value of λ, which leads to slow convergence and a subsurface model of limited accuracy.”