Fig. 6

Schematic spatiotemporal distribution of long-term slow slip events along the Suruga and Nankai troughs together with the moment magnitudes. 1: Tokai (Ozawa et al. 2016), 2: Kii channel (Kobayashi 2014), 3: Kii channel (GSI 2016), 4: western to central Shikoku (Takagi et al. 2016), 5: Bungo (Ozawa et al. 2013), 6: northern Miyazaki and southern Miyazaki (Ozawa et al. 2001), 7: southern Miyazaki (Yarai and Ozawa 2013), 8: Bungo, northern Miyazaki, and southern Miyazaki (this study). The 1997 southern Miyazaki slow slip is interpreted as an afterslip of the 1996 Hyuga-nada earthquakes. With regard to the 1997 northern Miyazaki slow slip, we cannot estimate the moment magnitude since it is not separable from the afterslip of the 1996 Hyuga-nada earthquakes and the 1997 Bungo slow slip. The moment magnitudes of the Bungo slow slip, northern Miyazaki slow slip, and southern Miyazaki slow slip in this study range from M _w6.0 to M _w6.5. However, these values were estimated by summing the slow slips in their approximate regions, which are shown in Fig. 4h. Thus, the estimated moment magnitudes of the Bungo, northern, and southern Miyazaki slow slips in this study are very approximate since we cannot clearly separate the events in time and space. The values of the moment magnitude of the southern Miyazaki slow slip obtained by Yarai and Ozawa (2013) are also rough estimates since we cannot clearly separate the southern Miyazaki slow slip in the time and space domains