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(a) Simulated wave fields at various times show surface acoustic wave (SAW) and supershear evanescent wave (SEW) propagation. Simulation parameters are = 5 m/s, = 10 μs, and = 500 μm. The dynamic range has been adjusted to emphasize the SEW. (b) Surface waveforms at the same times show faster propagation and decaying amplitude of the SEW compared to those of the SAW.
