Figure 1
From: Strength of tremor patches along deep transition zone of a megathrust
Spatial characteristics of tremor activities. Spatial distribution of (a), energy, (b) the number of tremors, and (c), mean duration of each tremor sequence, based on the tremor catalog10 during the ETS episodes from April 2004 to March 2015 in western Shikoku (the black rectangle in the upper-left inset). The study area is divided into three sub-areas. The green rectangle is the main slip region of long-term SSEs in the Bungo channel in 201031. The white arrow in the inset indicates the plate motion of the subducting Philippine Sea (PH) plate relative to the Amurian (AM) plate. Maps are created using the GMT (Generic Mapping Tools, http://gmt.soest.hawaii.edu/) software package32.
