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Simulated waveforms collected for 30 mm vertical (90°) crack model using (a) 10 kHz and (b) 150 kHz excitations; for 150 mm vertical (90°) crack model using (c) 10 kHz and (d) 150 kHz excitations; for 150 mm inclined 30° crack model using (e) 10 kHz and (f) 150 kHz excitations; for 150 mm inclined 150° crack model using (g) 10 kHz and (h) 150 kHz excitations.
