Tokai segment
E375878
Tokai segment is a seismically active portion of the Nankai megathrust off central Japan, known for its potential to generate large, damaging earthquakes and tsunamis.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tokai segment canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3646892 — 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: Tokai segment Context triple: [Nankai Trough, segment, Tokai segment]
-
A.
Tokai
Tokai is a suburb in Cape Town, South Africa, known for its residential areas, green spaces, and proximity to the Constantiaberg mountains.
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B.
Okayama–Hakata section
The Okayama–Hakata section is the western stretch of Japan’s Sanyō Shinkansen high-speed rail line, linking Okayama with Hakata (Fukuoka) across the Chūgoku region.
-
C.
Meitetsu
Meitetsu is a major private railway company in Japan’s Chubu region, best known for operating extensive rail and transport services centered around Nagoya.
-
D.
Toshima
Toshima is a special ward in northwest Tokyo known for the major commercial and entertainment hub of Ikebukuro and its dense urban residential districts.
-
E.
Tajima region
The Tajima region is a northern area of Hyōgo Prefecture in Japan, known for its rural landscapes, hot springs, and the origin of the famed Tajima-gyu cattle used for Kobe beef.
- 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: Tokai segment Target entity description: Tokai segment is a seismically active portion of the Nankai megathrust off central Japan, known for its potential to generate large, damaging earthquakes and tsunamis.
-
A.
Tokai
Tokai is a suburb in Cape Town, South Africa, known for its residential areas, green spaces, and proximity to the Constantiaberg mountains.
-
B.
Okayama–Hakata section
The Okayama–Hakata section is the western stretch of Japan’s Sanyō Shinkansen high-speed rail line, linking Okayama with Hakata (Fukuoka) across the Chūgoku region.
-
C.
Meitetsu
Meitetsu is a major private railway company in Japan’s Chubu region, best known for operating extensive rail and transport services centered around Nagoya.
-
D.
Toshima
Toshima is a special ward in northwest Tokyo known for the major commercial and entertainment hub of Ikebukuro and its dense urban residential districts.
-
E.
Tajima region
The Tajima region is a northern area of Hyōgo Prefecture in Japan, known for its rural landscapes, hot springs, and the origin of the famed Tajima-gyu cattle used for Kobe beef.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
megathrust fault segment
ⓘ
seismotectonic region ⓘ |
| adjacentTo |
Kanto region plate boundary zones
ⓘ
Tonankai segment ⓘ |
| associatedWith |
great interplate earthquakes
ⓘ
tsunami generation ⓘ |
| country | Japan ⓘ |
| earthquakePotentialMagnitude | around magnitude 8 class (model-based estimate) ⓘ |
| geologicalFeature | portion of plate interface beneath Nankai Trough ⓘ |
| governedBy | Japanese disaster management legislation ⓘ |
| hasHistoricalEarthquakes |
1707 Hoei earthquake
ⓘ
1854 Ansei-Tokai earthquake ⓘ |
| hazardType |
megathrust earthquake
ⓘ
tsunami ⓘ |
| includedIn | Japanese national seismic hazard maps ⓘ |
| knownFor |
potential to generate large earthquakes
ⓘ
potential to generate tsunamis ⓘ |
| locatedIn |
Pacific coast of Japan
ⓘ
surface form:
Pacific margin of Honshu
offshore central Japan ⓘ |
| monitoredBy |
Japan Meteorological Agency
ⓘ
Japanese government earthquake monitoring programs ⓘ seismological networks in Japan ⓘ |
| monitoredParameters |
crustal deformation
ⓘ
seismicity ⓘ slow slip events ⓘ |
| near |
Izu Peninsula
ⓘ
Mikawa Bay ⓘ Suruga Bay ⓘ |
| overridingPlate |
Amur Plate
ⓘ
Eurasian Plate ⓘ |
| partOf |
Nankai megathrust
ⓘ
surface form:
Nankai Trough subduction zone
Nankai megathrust ⓘ |
| plateBoundaryType | subduction megathrust ⓘ |
| recurrenceInterval | on the order of 100–150 years (approximate, model-dependent) ⓘ |
| regionNameOrigin | named after Tokai region of Japan ⓘ |
| riskCategory | major source of anticipated future great earthquake in Japan ⓘ |
| riskTo |
Aichi Prefecture
NERFINISHED
ⓘ
Chubu region of Japan ⓘ Shizuoka Prefecture NERFINISHED ⓘ Tōkai region ⓘ
surface form:
Tokai region of Japan
|
| seismicHazardLevel | high ⓘ |
| studiedBy |
earthquake engineers
ⓘ
seismologists ⓘ |
| studiedFor | earthquake prediction research in Japan ⓘ |
| subductionOf | Philippine Sea Plate ⓘ |
| tectonicSetting | convergent plate boundary ⓘ |
| tsunamiRiskTo |
Aichi coastal communities
ⓘ
Pacific coast of central Honshu ⓘ Shizuoka coastal communities ⓘ |
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: Tokai segment Description of subject: Tokai segment is a seismically active portion of the Nankai megathrust off central Japan, known for its potential to generate large, damaging earthquakes and tsunamis.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.