Arrows show the location of trench or trough
(see Figure 3).
K: Kuril Trench, J: Japan Trench, I: Izu-Bonin Trench, N: Nankai Trough, R: Ryukyu Trench
The map was created using data (Jan. 2006 to Dec. 2010) obtained from the website of National Research Institute for Earth Science and Disaster Prevention.
Maps from different view points: Figures 5-2, 5-3, 5-4