Fig. 3

Examples of seismic structural model visualizations using Google Earth. The green rectangles on the Earth’s surface show the user-defined search area, and the source references of the models are shown in the white balloons. a 3D seismic velocity model (Liu and Zhao 2014; Liu et al. 2013). b 2D seismic velocity model (Kodaira et al. 2006). c 2D plate geometry model (Kodaira et al. 2000). d 3D plate geometry model (Nakanishi et al. 2018). e Hypocenter distributions (Akuhara et al. 2013)