Hypocenter distribution of NNE-trending linearly aligned clusters (clusters 1 and 2). The same symbols and colors are used for earthquake clusters with five or more earthquakes as those in Figure 8. The gray dashed lines in the cross sections represent the plate interface and the oceanic Moho estimated by a previous tomography analysis (Akuhara et al.2013). The locations of the cross sections are represented by black dashed lines. Focal mechanisms are shown using the same notation as in Figure 9b. The arrows indicate the lineation directions for the earthquake clusters.