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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

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

Fig. 7

Comparison of automatically determined hypocenters before and after applying the phase classifier. a, c Automatically determined hypocenters from Tamaribuchi and Nakagawa (2020), i.e., without the phase classifier; b, d the same data after application of our phase classifier. a, b Hypocenter distributions; symbol colors indicate depth. c, d Percentage of false P- and S-phase picks within ± 0.5 s of S- and P-wave arrivals, respectively, in the JMA unified catalog. The vertical blue dashed line indicates the origin time of the 2011 Tohoku earthquake

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