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a
Kuril Trench
b
Japan Trench (39°20'-41°00'N)
Tn
F
0°
0°
Ts
M2
T
M1
M1
N90°W
N90°E
N90°W
N90°E
0.8
0.4
0
0.4
0.8
0.8
0.4
0
0.4
0.8
c
Japan Trench (38°00'-39°20'N)
d
Japan Trench (35°40'-38°00'N)
Tn
Tn
0°
0°
F
F
Ts
Ts
M2
M2
M1
M1
N90°W
N90°E
N90°W
N90°E
0.8
0.4
0
0.4
0.8
0.8
0.4
0
0.4
0.8
f
Izu-Ogasawara Trench
(33°36'-35°11'N)
e
Izu-Ogasawara Trench
(35°11'-35°40'N)
0°
T
F
F
0°
T
PR
PR
M1
M1
N90°W
N90°E
N90°W
N90°E
0.8
0.4
0
0.4
0.8
0.8
0.4
0
0.4
0.8
g
Izu-Ogasawara Trench
(33°05'-33°36'N)
0°
h
Izu-Ogasawara Trench
(32°00'-33°05'N)
0°
T
T
F
F
PR
PR
M1
M1
N90°W
N90°E
N90°W
N90°E
0.8
0.4
0
0.4
0.8
0.8
0.4
0
0.4
0.8
Fig. 23
Rose diagrams showing statistical distribution of bending-related topographic structures
in the oceanward slopes of the trenches studied in this study. Rose diagrams are normalized by the
number of structures with a mode strike.
F
strike of the fracture zones,
M1
orientation of the magnetic
anomaly lineations except for around 38°N near the Japan Trench,
M2
orientation of the magnetic
anomaly lineations around 38°N near the Japan Trench,
PR
trend of the abandoned propagating
spreading ridge around 34°30¢N,
T
general trend of the trench axis,
Tn
general trend of the trench
axis of the Japan Trench north of 38°N,
Ts
general trend of the trench axis of the Japan Trench
south of 38°N
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