Ryukyu back-arc basin
E231884
The Ryukyu back-arc basin is a seafloor spreading region behind the Ryukyu island arc, formed by the subduction of the Philippine Sea Plate beneath the Eurasian Plate and characterized by active tectonism and volcanism.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ryukyu back-arc basin canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2079828 — 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: Ryukyu back-arc basin Context triple: [Ryukyu Arc, hasPart, Ryukyu back-arc basin]
-
A.
Kyushu–Palau Ridge system
The Kyushu–Palau Ridge system is a major underwater volcanic island arc and tectonic ridge in the Philippine Sea, formed by subduction-related processes along the western Pacific margin.
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B.
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.
-
C.
Okinawa Plate
The Okinawa Plate is a minor tectonic plate in the western Pacific region, underlying parts of the East China Sea and associated with active subduction zones and seismic activity near Japan and Taiwan.
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D.
Izu–Bonin Arc
The Izu–Bonin Arc is a volcanic island arc in the western Pacific Ocean formed by subduction along the boundary of the Philippine Sea Plate, stretching south from Japan’s Izu Peninsula toward the Mariana Islands.
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E.
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.
- 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: Ryukyu back-arc basin Target entity description: The Ryukyu back-arc basin is a seafloor spreading region behind the Ryukyu island arc, formed by the subduction of the Philippine Sea Plate beneath the Eurasian Plate and characterized by active tectonism and volcanism.
-
A.
Kyushu–Palau Ridge system
The Kyushu–Palau Ridge system is a major underwater volcanic island arc and tectonic ridge in the Philippine Sea, formed by subduction-related processes along the western Pacific margin.
-
B.
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.
-
C.
Okinawa Plate
The Okinawa Plate is a minor tectonic plate in the western Pacific region, underlying parts of the East China Sea and associated with active subduction zones and seismic activity near Japan and Taiwan.
-
D.
Izu–Bonin Arc
The Izu–Bonin Arc is a volcanic island arc in the western Pacific Ocean formed by subduction along the boundary of the Philippine Sea Plate, stretching south from Japan’s Izu Peninsula toward the Mariana Islands.
-
E.
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.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
back-arc basin
ⓘ
geological formation ⓘ marine basin ⓘ |
| adjacentTo | Okinawa Trough ⓘ |
| associatedWith |
Ryukyu island arc
ⓘ
island arc volcanism ⓘ |
| beneath | Eurasian Plate ⓘ |
| boundedBy | Ryukyu Trench ⓘ |
| causedBySubductionOf | Philippine Sea Plate ⓘ |
| characterizedBy |
active tectonism
ⓘ
active volcanism ⓘ |
| formedBy |
seafloor spreading
ⓘ
subduction-related extension ⓘ |
| geologicalAge | Cenozoic ⓘ |
| geologicalProcess | back-arc spreading ⓘ |
| hasFeature |
crustal extension
ⓘ
normal faulting ⓘ volcanic activity ⓘ |
| locatedIn |
East China Sea
ⓘ
surface form:
East China Sea region
western Pacific Ocean ⓘ |
| overlies |
Eurasian continental margin
ⓘ
surface form:
Eurasian Plate margin
|
| partOf |
Philippine Sea Plate
ⓘ
surface form:
Philippine Sea Plate margin
Ryukyu subduction zone ⓘ
surface form:
Ryukyu subduction system
|
| relatedTo |
Philippine Sea Plate
ⓘ
surface form:
Philippine Sea Plate–Eurasian Plate convergence
|
| studiedInDiscipline |
marine geology
ⓘ
plate tectonics ⓘ volcanology ⓘ |
| tectonicRegime | extensional ⓘ |
| tectonicSetting | back-arc region ⓘ |
| underlainBy | Philippine Sea Plate ⓘ |
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: Ryukyu back-arc basin Description of subject: The Ryukyu back-arc basin is a seafloor spreading region behind the Ryukyu island arc, formed by the subduction of the Philippine Sea Plate beneath the Eurasian Plate and characterized by active tectonism and volcanism.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.