Fig. 2From: The Wakayama earthquake swarm in JapanSeismicity around the Wakayama earthquake swarm. a Map showing the M ≥ 1 earthquake distribution, with the focal depths color-coded. Gray dots denote low-frequency earthquakes. Black contours denote the iso-depth contours of the PHS slab at a 10-km interval. The rectangle denotes the Wakayama swarm. b Vertical cross sections of the earthquakes within ± 10 km from the three profiles in (a). The Wakayama earthquake swarm is shown by an orange ellipse in profile B. The upper surface of the PHS slab is shown by the gray line in each cross sectionBack to article page