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Fig. 7 | Earth, Planets and Space

Fig. 7

From: Noise classification for the unified earthquake catalog using ensemble learning: the enhanced image of seismic activity along the Japan Trench by the S-net seafloor network

Fig. 7

Seismic activity and tectonics along the Japan Trench. a Epicentral distribution of automatically determined epicenters (M all, within 10 km distance from the upper surface of the Pacific Plate). The colors indicate depth. Ellipses N and S indicate clusters of shallow microearthquakes. b Slow earthquake distribution determined by Nishikawa et al. (2019). Red color indicates low-frequency tremors of 80 s or longer duration; yellow indicates VLFEs; and blue indicates background swarms. c P-wave velocity structure perturbation of the top surface of the subducting Pacific Plate determined by Hua et al. (2020). The contour lines show the distribution of coseismic slip determined by Yoshida et al. (2011) for the 2011 Tohoku earthquake. The unit of the contour line is meters. d Distribution of S-net stations. Black dashed lines indicate the plate isodepth lines from the JIVSM (Koketsu et al. 2012). The purple dashed line shows the forearc segment boundary according to Bassett et al. (2016). The green dotted circle indicates the location of the subducted seamount according to Mochizuki et al. (2008)

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