Fig. 3
From: Recent advances in earthquake seismology using machine learning
Distribution of ground-motion dataset used by Kubo et al. (2020) with the heat map showing the relationship between epicentral distance and PGA with their histograms (Fig. 5 of Kubo et al. (2020)). They used 186,310 ground-motion records in Japan, which were recorded from 1997 to 2015 by K-NET and KiK-net of National Research Institute for Earth Science and Disaster Resilience. The heat-map color denotes the number of ground-motion records