Fig. 2

Space–time diagram of detected LFEs from 1 April 2004 through 31 August 2015. Blue dots denote individual LFEs along a profile aligned E30° N–W30° S, subparallel to the Nankai Trough. Long stripe patterns of LFEs correspond to major ETS episodes. L-SSE means a long-term slow slip event in the Bungo Channel at the western edge of Shikoku island, which has been detected by Takagi et al. (2019). The vertical broken line corresponds to the timing of the 2011 Tohoku-Oki earthquake (Mw 9.0). Red shaded bar denotes an enhancement of rupture connectivity between several segments from Bungo Channel to the eastern Shikoku