Izu–Ogasawara Trench

E49726

oceanic trench subduction zone

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.

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All labels observed (6)

Label	Occurrences
Izu–Bonin Trench	6
Izu Trench	2
Izu-Bonin Trench	1
Izu–Ogasawara Trench canonical	1
Izu–Ogasawara Trench region	1
Ogasawara Trench	1

How this entity was disambiguated

This entity first appeared as the object of triple T356055 — 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: Izu–Ogasawara Trench
Context triple: [Philippine Sea, hasOceanTrench, Izu–Ogasawara Trench]

A. Japan Trench
The Japan Trench is a deep oceanic trench off northeastern Japan where the Pacific Plate subducts beneath the Okhotsk Plate, forming part of the Pacific Ring of Fire and generating powerful 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. Aleutian Trench
The Aleutian Trench is a deep oceanic trench in the North Pacific where the Pacific Plate subducts beneath the North American Plate, forming part of a major seismically active subduction zone.
D. Tonga Trench
The Tonga Trench is one of the deepest oceanic trenches on Earth, located in the southwestern Pacific and formed by the subduction of the Pacific Plate beneath the Indo-Australian Plate.
E. Philippine Trench
The Philippine Trench is a deep oceanic trench in the western Pacific, known as one of the deepest points on Earth’s seafloor and a major site of tectonic subduction.
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: Izu–Ogasawara Trench
Target entity description: 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.

A. Japan Trench
The Japan Trench is a deep oceanic trench off northeastern Japan where the Pacific Plate subducts beneath the Okhotsk Plate, forming part of the Pacific Ring of Fire and generating powerful 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. Aleutian Trench
The Aleutian Trench is a deep oceanic trench in the North Pacific where the Pacific Plate subducts beneath the North American Plate, forming part of a major seismically active subduction zone.
D. Tonga Trench
The Tonga Trench is one of the deepest oceanic trenches on Earth, located in the southwestern Pacific and formed by the subduction of the Pacific Plate beneath the Indo-Australian Plate.
E. Philippine Trench
The Philippine Trench is a deep oceanic trench in the western Pacific, known as one of the deepest points on Earth’s seafloor and a major site of tectonic subduction.
F. None of above. chosen

Statements (47)

Predicate	Object
instanceOf	oceanic trench ⓘ subduction zone ⓘ
associatedHazard	megathrust earthquakes ⓘ tsunamis ⓘ
associatedPlate	Pacific Plate ⓘ Philippine Sea Plate ⓘ
associatedWith	Izu–Bonin volcanic arc ⓘ linked to: Izu–Bonin Arc Izu–Bonin–Mariana Arc system ⓘ linked to: Izu–Bonin Arc Ogasawara (Bonin) Islands ⓘ linked to: Ogasawara Islands
causes	frequent earthquakes ⓘ intense seismic activity ⓘ volcanic activity ⓘ
countryBorder	Japan ⓘ
crustType	oceanic crust ⓘ
depthCategory	hadal zone ⓘ
extendsFrom	south of Honshu, Japan ⓘ
extendsToward	the Mariana Trench region ⓘ
featureType	deep-sea trench ⓘ
formedBy	subduction of the Pacific Plate beneath the Philippine Sea Plate ⓘ
geologicalAge	Cenozoic origin ⓘ
geologicalProcess	oceanic–oceanic subduction ⓘ
influences	regional tsunami hazard ⓘ seismic hazard in Japan ⓘ
isSegmentOf	Izu–Bonin–Mariana Trench system ⓘ
linkedTo	Izu–Bonin forearc ⓘ Philippine Sea Plate interior ⓘ linked to: Philippine Sea Plate
locatedIn	western Pacific Ocean ⓘ
locatedOffCoastOf	Japan ⓘ
marginType	active continental margin (Japan side) ⓘ oceanic island arc margin ⓘ
maximumDepth	over 29000 ft ⓘ over 9000 m ⓘ
monitoredBy	Japanese seismic networks ⓘ ocean-bottom seismometers ⓘ
namedAfter	Izu Islands ⓘ Ogasawara (Bonin) Islands ⓘ linked to: Ogasawara Islands
ocean	Pacific Ocean ⓘ
orientation	roughly north–south ⓘ
parallelTo	Izu–Bonin–Mariana island arc ⓘ linked to: Izu–Bonin Arc
partOf	Pacific Ring of Fire ⓘ northwest Pacific plate boundary zone ⓘ
relatedTo	Japan Trench ⓘ Mariana Trench ⓘ
researchInterest	deep-sea ecosystems ⓘ plate subduction dynamics ⓘ
supports	hadal benthic communities ⓘ
tectonicSetting	convergent plate boundary ⓘ

How these facts were elicited