Shikoku Basin
E125529
Shikoku Basin is a back-arc basin in the Philippine Sea, located south of Japan and formed by seafloor spreading behind the Izu–Bonin–Mariana volcanic arc.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Shikoku Basin canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T554295 — 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: Shikoku Basin Context triple: [Philippine Sea Plate, hasFeature, Shikoku Basin]
-
A.
Seto Inland Sea region
The Seto Inland Sea region is a coastal area of western Japan known for its sheltered waters, numerous islands, maritime industry, and historically important naval and commercial ports.
-
B.
Kyushu
Kyushu is the southwesternmost of Japan’s main islands, known for its active volcanoes, hot springs, and historic cities such as Fukuoka and Nagasaki.
-
C.
Okhotsk Plate
The Okhotsk Plate is a minor tectonic plate in the northwest Pacific region, underlying parts of northeastern Asia including the Sea of Okhotsk and adjacent areas of Japan and Russia.
-
D.
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.
-
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: Shikoku Basin Target entity description: Shikoku Basin is a back-arc basin in the Philippine Sea, located south of Japan and formed by seafloor spreading behind the Izu–Bonin–Mariana volcanic arc.
-
A.
Seto Inland Sea region
The Seto Inland Sea region is a coastal area of western Japan known for its sheltered waters, numerous islands, maritime industry, and historically important naval and commercial ports.
-
B.
Kyushu
Kyushu is the southwesternmost of Japan’s main islands, known for its active volcanoes, hot springs, and historic cities such as Fukuoka and Nagasaki.
-
C.
Okhotsk Plate
The Okhotsk Plate is a minor tectonic plate in the northwest Pacific region, underlying parts of northeastern Asia including the Sea of Okhotsk and adjacent areas of Japan and Russia.
-
D.
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.
-
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 (47)
| Predicate | Object |
|---|---|
| instanceOf |
back-arc basin
ⓘ
geologic basin ⓘ submarine basin ⓘ |
| adjacentTo |
Izu–Ogasawara Trench
ⓘ
surface form:
Izu–Bonin Trench
Nankai Trough ⓘ |
| associatedWith |
Izu–Bonin Arc
ⓘ
surface form:
Izu–Bonin–Mariana volcanic arc
Philippine Sea Plate ⓘ |
| boundedBy |
Izu–Bonin Arc
ⓘ
surface form:
Izu–Bonin Ridge
Kyushu–Palau Ridge system ⓘ
surface form:
Kyushu–Palau Ridge
Nankai Trough ⓘ West Philippine Basin ⓘ |
| countryOffshoreFrom | Japan ⓘ |
| crustType | oceanic crust ⓘ |
| formedBy | seafloor spreading ⓘ |
| geologicalAge | Cenozoic ⓘ |
| hasFeature |
magnetic lineations from seafloor spreading
ⓘ
sediment-covered oceanic crust ⓘ |
| hasMorphology | abyssal plain ⓘ |
| hasTectonicSignificance |
constrains timing of Izu–Bonin–Mariana arc development
ⓘ
records evolution of the Philippine Sea Plate ⓘ |
| isExampleOf | back-arc basin formed by subduction rollback ⓘ |
| liesBetween |
Izu–Bonin Arc
ⓘ
surface form:
Izu–Bonin Ridge and Kyushu–Palau Ridge
|
| liesEastOf |
Kyushu–Palau Ridge system
ⓘ
surface form:
Kyushu–Palau Ridge
|
| liesNorthOf | West Philippine Basin ⓘ |
| liesWestOf |
Izu–Ogasawara Trench
ⓘ
surface form:
Izu–Bonin Trench
|
| locatedIn |
Philippine Sea
ⓘ
western Pacific Ocean ⓘ |
| locatedSouthOf |
Honshu
ⓘ
Japan ⓘ Shikoku ⓘ |
| namedAfter |
Shikoku
ⓘ
surface form:
Shikoku Island
|
| oceanRegion |
western Pacific Ocean
ⓘ
surface form:
Northwest Pacific
|
| openingBegan | Oligocene ⓘ |
| openingBeganApproxMa | about 30 million years ago ⓘ |
| openingEndedApproxMa | about 15 million years ago ⓘ |
| overriddenBy | Eurasian Plate ⓘ |
| partOf |
Philippine Sea Plate
ⓘ
surface form:
Philippine Sea Plate oceanic crust
|
| relatedProcess | subduction of the Philippine Sea Plate ⓘ |
| relatedTo | Nankai megathrust ⓘ |
| researchField |
marine geology
ⓘ
plate tectonics ⓘ |
| seafloorSpreadingType | back-arc spreading ⓘ |
| spreadingCenterType | extinct spreading ridge ⓘ |
| spreadingStatus | ceased ⓘ |
| subductingUnder | Eurasian Plate at the Nankai Trough ⓘ |
| tectonicOrigin | rollback of the Izu–Bonin–Mariana subduction zone ⓘ |
| tectonicSetting | back-arc region of the Izu–Bonin–Mariana arc ⓘ |
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: Shikoku Basin Description of subject: Shikoku Basin is a back-arc basin in the Philippine Sea, located south of Japan and formed by seafloor spreading behind the Izu–Bonin–Mariana volcanic arc.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.