Nankai Trough  search
BTPacific Ocean
 .North Pacific
 ..Northwest Pacific
 ...Nankai Trough
RTPhilippine Sea
 DSDP Site 297
 DSDP Site 298
 DSDP Site 582
 Leg 87
 DSDP Site 583
 Nankaido earthquake 1946
SNOff SE Japan. This term has multiple hierarchies. Added to Thesaurus in 1985.