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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

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

Fig. 6

Epicentral distributions for quality labels (a, e, i) A, (b, f, j) B, (c, g, k) C, and (d, h, l) D. Symbol colors indicate depth. a–d Training dataset, i.e., automatically determined hypocenters from Tamaribuchi and Nakagawa (2020) that we visually classified into each label. e–l Automatically classified hypocenters using LightGBM label classifier in this study during the period 1–31 March 2011. i–l An enlarged view of the area shown by the green box in (f)

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