Fig. 2
From: Migration diffusivity as a controlling factor in the duration of earthquake swarms
Hypocenter distribution in each swarm area shown in Fig. 1. Colored circles denote the epicentral location of M ≥ 1.0 earthquakes that occurred from 11 March 2011 to 31 December 2019 from the unified catalog of the Japan Meteorological Agency. The color and the size of circles indicate the depth and the magnitude of each event. a–e Show the seismicity for Moriyoshi, Kakunodate, Gassan, Sendai, and Yonezawa–Kitakata areas, respectively. A–D in e represents the subdivision of seismic clusters. Blue stars represent the epicenter of the first earthquake in each area