Figure 4
From: Episodic tremor and slip silently invades strongly locked megathrust in the Nankai Trough
Schematic illustration of the plate boundary in western Shikoku. (a) Spatial relation among cumulative slip distribution of S-SSEs (as in Fig. 3c), L-SSEs (blue rectangles18; black dotted line20), slip deficit rate (purple lines14) and coseismic slip distribution in the 1946 Nankai earthquake (green lines30). Red dots indicate LFE locations. The black dashed lines are the depth contours of the upper surface of the subducting PH with an interval of 10 km41,42,43. The vertical profiles in the black line (X-Y) are illustrated in (b,c). (b,c) Schematic illustration of the vertical cross-section of X-Y in the inter-SSE and ETS periods, respectively. Red, blue, and brown lines correspond to the ETS, L-SSE and locked seismogenic zones, respectively. The green rectangle indicates a seal that confines fluid below in (b), the inter-SSE period and is broken in (c), the ETS period.
