Sagami Trough

E645145

oceanic trench plate boundary subduction zone

Sagami Trough is a deep submarine trench off central Japan that marks a major tectonic plate boundary and is associated with significant seismic and tsunami activity.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (2)

Label	Occurrences
Sagami Trough canonical	2
Sagami Trough subduction zone	1

How this entity was disambiguated

This entity first appeared as the object of triple T7161595 — 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: Sagami Trough
Context triple: [Sagami Bay, hasFeature, Sagami 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. 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.
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. Okinawa Trough
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.
E. Beppu–Shimabara graben
The Beppu–Shimabara graben is a tectonic rift zone in Kyushu, Japan, characterized by active volcanism, hot springs, and significant crustal deformation.
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: Sagami Trough
Target entity description: Sagami Trough is a deep submarine trench off central Japan that marks a major tectonic plate boundary and is associated with significant seismic and tsunami 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. 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.
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. Okinawa Trough
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.
E. Beppu–Shimabara graben
The Beppu–Shimabara graben is a tectonic rift zone in Kyushu, Japan, characterized by active volcanism, hot springs, and significant crustal deformation.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	oceanic trench ⓘ plate boundary ⓘ subduction zone ⓘ
associatedWith	interplate earthquakes ⓘ megathrust earthquakes ⓘ slow slip events ⓘ tsunamis ⓘ
country	Japan ⓘ
extendsFrom	offshore Boso Peninsula ⓘ
extendsTo	near Izu Peninsula ⓘ
geologicalAge	Cenozoic ⓘ
knownFor	high seismic coupling ⓘ recurrent great earthquakes ⓘ
lastMajorEarthquake	1923 Great Kanto earthquake ⓘ linked to: Great Kanto earthquake
lastMajorEarthquakeGenerated	destructive tsunami ⓘ
lastMajorEarthquakeMagnitude	approximately 7.9 ⓘ
lastMajorEarthquakeType	megathrust earthquake ⓘ
locatedIn	Pacific Ocean ⓘ
locatedNear	Kanto region ⓘ linked to: Kanto Sagami Bay ⓘ Tokyo ⓘ
locatedOffCoastOf	Honshu ⓘ central Japan ⓘ
marksBoundaryBetween	Eurasian Plate (in some models) ⓘ linked to: Eurasian Plate Okhotsk Plate ⓘ Philippine Sea Plate ⓘ
maximumDepth	over 3000 m ⓘ
monitoredBy	Japan Meteorological Agency ⓘ National Research Institute for Earth Science and Disaster Resilience ⓘ ocean-bottom seismograph networks ⓘ
overridingPlate	Honshu arc ⓘ Okhotsk Plate ⓘ
parallelTo	Japanese island arc ⓘ
partOf	Japan Trench–Sagami Trough–Nankai Trough plate boundary system ⓘ linked to: Japan Trench
relatedFeature	Izu–Bonin–Mariana arc ⓘ linked to: Izu–Bonin Arc Japan Trench ⓘ Nankai Trough ⓘ
riskCategory	source of potential future great earthquake near Tokyo ⓘ
seismicHazardFor	Kanto region ⓘ linked to: Kanto Shizuoka Prefecture ⓘ Tokyo metropolitan area ⓘ
studiedIn	plate tectonics ⓘ seismology ⓘ tsunami science ⓘ
subductingPlate	Philippine Sea Plate ⓘ
tectonicSetting	convergent plate boundary ⓘ