Okinawa Trough
E234385
The Okinawa Trough is a back-arc basin in the East China Sea, located between the Ryukyu Islands and mainland Asia, known for its active tectonics and hydrothermal activity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Okinawa Trough canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T2079829 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Okinawa Trough Context triple: [Ryukyu Arc, hasPart, Okinawa Trough]
-
A.
Nankai Trough
The Nankai Trough is a major submarine trench off the coast of southwestern Japan, known as a highly active subduction zone capable of generating powerful megathrust earthquakes and tsunamis.
-
B.
Ryukyu Trench
The Ryukyu Trench is a deep oceanic trench in the western Pacific, running along the Ryukyu Islands south of Japan where the Philippine Sea Plate subducts beneath the Eurasian Plate.
-
C.
Izu–Ogasawara Trench
The Izu–Ogasawara Trench is a deep oceanic trench in the western Pacific formed by the subduction of the Pacific Plate beneath the Philippine Sea Plate, contributing to intense seismic and volcanic activity in the region.
-
D.
Kuril Trench
The Kuril Trench is a deep oceanic trench in the northwest Pacific Ocean off the Kuril Islands, formed by the subduction of the Pacific Plate beneath the Okhotsk Plate and known for its intense seismic and volcanic activity.
-
E.
Harima-nada Sea
The Harima-nada Sea is a section of Japan’s Seto Inland Sea along the coast of Hyōgo Prefecture, known for its sheltered waters, fishing grounds, and busy maritime routes.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Okinawa Trough Target entity description: The Okinawa Trough is a back-arc basin in the East China Sea, located between the Ryukyu Islands and mainland Asia, known for its active tectonics and hydrothermal activity.
-
A.
Nankai Trough
The Nankai Trough is a major submarine trench off the coast of southwestern Japan, known as a highly active subduction zone capable of generating powerful megathrust earthquakes and tsunamis.
-
B.
Ryukyu Trench
The Ryukyu Trench is a deep oceanic trench in the western Pacific, running along the Ryukyu Islands south of Japan where the Philippine Sea Plate subducts beneath the Eurasian Plate.
-
C.
Izu–Ogasawara Trench
The Izu–Ogasawara Trench is a deep oceanic trench in the western Pacific formed by the subduction of the Pacific Plate beneath the Philippine Sea Plate, contributing to intense seismic and volcanic activity in the region.
-
D.
Kuril Trench
The Kuril Trench is a deep oceanic trench in the northwest Pacific Ocean off the Kuril Islands, formed by the subduction of the Pacific Plate beneath the Okhotsk Plate and known for its intense seismic and volcanic activity.
-
E.
Harima-nada Sea
The Harima-nada Sea is a section of Japan’s Seto Inland Sea along the coast of Hyōgo Prefecture, known for its sheltered waters, fishing grounds, and busy maritime routes.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
back-arc basin
ⓘ
tectonic feature ⓘ |
| associatedWith |
Eurasian Plate
ⓘ
Philippine Sea Plate subduction ⓘ Ryukyu Trench ⓘ |
| boundedBy |
Ryukyu Islands
ⓘ
continental margin of China ⓘ |
| extendsFrom |
western Japan
ⓘ
surface form:
southwestern Japan region
|
| extendsTo |
Taiwan, Province of China
ⓘ
surface form:
Taiwan region
|
| geologicalAge | Cenozoic ⓘ |
| hasBiologicalSignificance |
chemosynthetic fauna
ⓘ
hydrothermal vent ecosystems ⓘ |
| hasCrustType |
thinned continental crust
ⓘ
transitional crust ⓘ |
| hasEconomicInterest |
seafloor massive sulfide deposits
ⓘ
submarine mineral resources ⓘ |
| hasFeature |
hydrothermal fields
ⓘ
hydrothermal vents ⓘ rift valleys ⓘ sediment-filled basin floor ⓘ volcanic ridges ⓘ |
| hasGeologicalActivity |
active rifting
ⓘ
crustal extension ⓘ normal faulting ⓘ seismic activity ⓘ volcanism ⓘ |
| isSiteOf |
active faulting
ⓘ
back-arc spreading ⓘ submarine volcanism ⓘ |
| knownFor |
active tectonics
ⓘ
chemosynthetic biological communities ⓘ intense hydrothermal activity ⓘ submarine hydrothermal mineralization ⓘ |
| locatedIn |
East China Sea
ⓘ
western Pacific Ocean ⓘ |
| openingBegan | Late Miocene ⓘ |
| openingContinued |
Pliocene
ⓘ
Quaternary ⓘ |
| parallelTo |
Ryukyu island arc
ⓘ
surface form:
Ryukyu Island arc
Ryukyu Trench ⓘ |
| partOf |
Ryukyu island arc
ⓘ
surface form:
Ryukyu arc system
|
| separates |
Ryukyu Islands
ⓘ
mainland Asia ⓘ |
| studiedIn |
hydrothermal geochemistry
ⓘ
marine geology ⓘ plate tectonics ⓘ |
| tectonicSetting |
back-arc extension
ⓘ
subduction-related ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Okinawa Trough Description of subject: The Okinawa Trough is a back-arc basin in the East China Sea, located between the Ryukyu Islands and mainland Asia, known for its active tectonics and hydrothermal activity.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.