Fig. 8From: Structured regularization based velocity structure estimation in local earthquake tomography for the adaptation to velocity discontinuitiesRecovery of the estimated average velocities by changing the number of arrival time data used in the analysis: a 1250; b 4393; and c 6414, which are about one-half, twice, and three times the number used in the main results, respectively. d MAE variations in the sample sizes for the estimation methods. The colored lines in a–c are the same as those in Fig. 4Back to article page