Example realization of the horizontal flow component ux at the surface (z = 0). The displayed snapshot is taken in the middle of the time period relevant for the travel times shown in Fig. 2 and is saturated at 33% of its maximum absolute value. Example realizations for uy are statistically similar but transposed, and examples for uz can be found in Lord (2014, Figs. 2.2 and 2.3).
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