Fig. 12From: Detection of hidden earthquakes after the 2011 Tohoku earthquake by automatic hypocenter determination combined with machine learningHeat maps of the events in Fig. 11. a Frequency distribution binned in a 0.02° × 0.02° grid. b Cross-sectional views of the frequency distributions counted in 2-km bins. Other details are as in Fig. 11. The blue rectangle in (a) marks the region off Kamaishi, Iwate Prefecture, shown in Fig. 13Back to article page