Sagami Trough
E645145
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sagami Trough canonical | 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.
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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.
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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 NERFINISHED ⓘ |
| lastMajorEarthquakeGenerated | destructive tsunami ⓘ |
| lastMajorEarthquakeMagnitude | approximately 7.9 ⓘ |
| lastMajorEarthquakeType | megathrust earthquake ⓘ |
| locatedIn | Pacific Ocean ⓘ |
| locatedNear |
Kanto region
NERFINISHED
ⓘ
Sagami Bay NERFINISHED ⓘ Tokyo NERFINISHED ⓘ |
| locatedOffCoastOf |
Honshu
NERFINISHED
ⓘ
central Japan ⓘ |
| marksBoundaryBetween |
Eurasian Plate (in some models)
NERFINISHED
ⓘ
Okhotsk Plate NERFINISHED ⓘ Philippine Sea Plate NERFINISHED ⓘ |
| maximumDepth | over 3000 m ⓘ |
| monitoredBy |
Japan Meteorological Agency
NERFINISHED
ⓘ
National Research Institute for Earth Science and Disaster Resilience NERFINISHED ⓘ ocean-bottom seismograph networks ⓘ |
| overridingPlate |
Honshu arc
ⓘ
Okhotsk Plate NERFINISHED ⓘ |
| parallelTo | Japanese island arc ⓘ |
| partOf | Japan Trench–Sagami Trough–Nankai Trough plate boundary system NERFINISHED ⓘ |
| relatedFeature |
Izu–Bonin–Mariana arc
NERFINISHED
ⓘ
Japan Trench NERFINISHED ⓘ Nankai Trough NERFINISHED ⓘ |
| riskCategory | source of potential future great earthquake near Tokyo ⓘ |
| seismicHazardFor |
Kanto region
NERFINISHED
ⓘ
Shizuoka Prefecture NERFINISHED ⓘ Tokyo metropolitan area NERFINISHED ⓘ |
| studiedIn |
plate tectonics
ⓘ
seismology ⓘ tsunami science ⓘ |
| subductingPlate | Philippine Sea Plate NERFINISHED ⓘ |
| tectonicSetting | convergent plate boundary ⓘ |
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: Sagami Trough Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.