Fig. 1
From: Streak and hierarchical structures of the Tohoku–Hokkaido subduction zone plate boundary
Moderate-size repeating earthquakes in the Tohoku–Hokkaido subduction zone. a Locations of repeating earthquakes. The magenta circles show repeating earthquakes (Uchida and Matsuzawa 2013), and cyan circles indicate the four studied repeating earthquake sequences. The yellow squares show the stations used in the relocation analysis. b–e Centroid locations (circles) for the repeating earthquakes in the Kushiro-Oki (b), Urakawa-Oki (c), Kamaishi-Oki (d), and Naka-Oki (e) regions, with the radius of each circle representing the expected source size. The beach balls give the focal mechanisms of selected events. The red arrows indicate the averaged slip direction that was determined from the focal mechanisms in each region