Wavefront healing: a banana–doughnut perspective

摘要: SUMMARY Wavefront healing is a ubiquitous diffraction phenomenon that affects cross-correlation traveltime measurements, whenever the scale of 3-D variations in wave speed comparable to characteristic wavelength waves. We conduct theoretical and numerical analysis this finite-frequency phenomenon, using pseudospectral code compute measure synthetic pressure-response waveforms ‘ground truth’ traveltimes at various distances behind smooth, spherical anomaly an otherwise homogeneous acoustic medium. ignored tomographic inversions based upon linearized geometrical ray theory, as much it strictly infinite-frequency approximation. In contrast, banana‐doughnut