Fig. 4
From: Stress loading and the occurrence of normal-type earthquakes under Boso Peninsula, Japan
a–d Same as Fig. 2a–d, but focal mechanisms, colors, and frequency histograms with respect to ΔCFF. Distribution of earthquakes with positive (+) and negative (−) ΔCFF shown in histograms. a, b Locked zone (same as Fig. 3) outlined with bold black line. e Fault type (τ′m) vs. ΔCFF plotted in vertical section, range same as for c and d. Circles indicate events before the 2011 M9 Tohoku earthquake and triangles indicate events after. Symbol color (orange, green, and purple) denotes Group A, B, or C