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Nankai Trough
The
Nankai Trough
is a submarine
trough
located south of the
Nankaido
region of
Japan
's island of
Honshu
, extending approximately 900 km offshore. The underlying
fault
, the
Nankai megathrust,
is the source of the devastating
Nankai megathrust earthquakes
, while the trough itself is potentially a major source of
hydrocarbon
fuel
, in the form of
methane clathrate
.
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