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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

From: Detection of hidden earthquakes after the 2011 Tohoku earthquake by automatic hypocenter determination combined with machine learning

Fig. 10

Hypocentral distribution in northern Nagano Prefecture (region 14 in Additional file 1: Fig. S1). a Hypocentral distribution in our merged catalog (11–12 March 2011, 0–50 km depth). Symbol colors indicate depth. b Spatiotemporal distribution projected in the N–S direction. c Magnitude-time diagram; red and gray circles are events in the JMA unified catalog and our merged catalog, respectively. Curves are plotted against the right vertical axis and show the cumulative numbers of events. Vertical blue dashed lines indicate the origin time of the 2011 Tohoku earthquake

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