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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

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

Fig. 4

Example of the phase classifier. a Station distribution (blue triangles). Green stars are epicenters from the JMA unified catalog during 23:52–23:55 on 11 March 2011. b The waveform of the unfiltered vertical component at station ODAWA2. Symbols plotted above the waveform are pick times when pth = 1.0, and those below are pick times when pth = 0.9. Circles and crosses are P- and S-wave picks, respectively. c, d P- and S-phase picks when pth = 1.0 and 0.9, respectively. The dashed lines indicate the latitude of station OADAWA2. e, f Total number of picks and precision (i.e., the percentage of automatically determined hypocenters that coincide with the JMA unified catalog) during 00:00–12:00 on 1 March 2011 and 12:00–24:00 on 11 March 2011, respectively

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