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Relative velocity records, at 40 mm away from the hypocenter, that capture the sub-Rayleigh to supershear transition. (a) A sub-Rayleigh crack transitioning to a supershear crack (α = 30°, P = 14 MPa). (b) A sub-Rayleigh pulse transitioning to a supershear pulse (α = 27.5°, P = 14 MPa).
