Fig. 1
From: Migration diffusivity as a controlling factor in the duration of earthquake swarms
Seismicity of northeastern Japan after the 2011 Off the Pacific Coast of Tohoku earthquake. Black crosses and yellow stars denote epicenters of M ≥ 1.0 and M ≥ 5.0 earthquakes, respectively, in the period from 11 March 2011 to 31 December 2019 at depths shallower than 20 km. Hypocenter data are taken from the unified catalog of the Japan Meteorological Agency. Red rectangles indicate the areas analyzed in this study: (a) Moriyoshi, (b) Kakunodate, (c) Gassan, (d) Sendai, and (e) Yonezawa–Kitakata. The purple rectangle shows the area of the fault model for the Tohoku earthquake (Yamazaki et al. 2018)