1946 Nankai earthquake
E377071
The 1946 Nankai earthquake was a powerful megathrust earthquake off the coast of southwestern Japan that generated a destructive tsunami and caused widespread damage and casualties in the Nankai region.
All labels observed (2)
| Label | Occurrences |
|---|---|
| 1946 Nankai earthquake canonical | 2 |
| Nankai earthquake of 1946 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3646888 — 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: 1946 Nankai earthquake Context triple: [Nankai Trough, lastMajorEarthquakeSequence, 1946 Nankai earthquake]
-
A.
1944 Tonankai earthquake
The 1944 Tonankai earthquake was a powerful undersea megathrust earthquake off the coast of Japan that generated a destructive tsunami and caused extensive damage and loss of life in the Tōkai and Kii Peninsula regions during World War II.
-
B.
Great Kanto earthquake
The Great Kanto earthquake was a devastating 1923 seismic disaster that struck the Tokyo-Yokohama region of Japan, causing massive destruction and loss of life.
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C.
Great Hanshin earthquake
The Great Hanshin earthquake was a devastating 1995 seismic disaster in Japan that caused widespread destruction and loss of life, particularly in the city of Kobe.
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D.
2011 Tōhoku earthquake and tsunami
The 2011 Tōhoku earthquake and tsunami was a devastating magnitude 9.0 undersea megathrust earthquake off Japan’s northeastern coast that triggered massive tsunamis, widespread destruction, and the Fukushima Daiichi nuclear disaster.
-
E.
2005 Nias–Simeulue earthquake
The 2005 Nias–Simeulue earthquake was a powerful magnitude 8.6 megathrust earthquake off the coast of northern Sumatra that caused widespread destruction and significant casualties in Indonesia.
- 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: 1946 Nankai earthquake Target entity description: The 1946 Nankai earthquake was a powerful megathrust earthquake off the coast of southwestern Japan that generated a destructive tsunami and caused widespread damage and casualties in the Nankai region.
-
A.
1944 Tonankai earthquake
The 1944 Tonankai earthquake was a powerful undersea megathrust earthquake off the coast of Japan that generated a destructive tsunami and caused extensive damage and loss of life in the Tōkai and Kii Peninsula regions during World War II.
-
B.
Great Kanto earthquake
The Great Kanto earthquake was a devastating 1923 seismic disaster that struck the Tokyo-Yokohama region of Japan, causing massive destruction and loss of life.
-
C.
Great Hanshin earthquake
The Great Hanshin earthquake was a devastating 1995 seismic disaster in Japan that caused widespread destruction and loss of life, particularly in the city of Kobe.
-
D.
2011 Tōhoku earthquake and tsunami
The 2011 Tōhoku earthquake and tsunami was a devastating magnitude 9.0 undersea megathrust earthquake off Japan’s northeastern coast that triggered massive tsunamis, widespread destruction, and the Fukushima Daiichi nuclear disaster.
-
E.
2005 Nias–Simeulue earthquake
The 2005 Nias–Simeulue earthquake was a powerful magnitude 8.6 megathrust earthquake off the coast of northern Sumatra that caused widespread destruction and significant casualties in Indonesia.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
megathrust earthquake
ⓘ
tsunami-generating earthquake ⓘ |
| buildingsDestroyed | tens of thousands of houses ⓘ |
| casualties |
over 1,300 deaths
ⓘ
thousands injured ⓘ |
| category |
1946 disasters in Japan
ⓘ
Earthquakes in Japan ⓘ Megathrust earthquakes ⓘ Tsunamis in Japan ⓘ |
| country | Japan ⓘ |
| damageType |
fires
ⓘ
ground shaking ⓘ landslides ⓘ tsunami inundation ⓘ |
| date | 1946-12-21 ⓘ |
| depth | ~24 km ⓘ |
| epicenter | off the coast of southern Kii Peninsula ⓘ |
| epicenterRegion | Nankai Trough off southwestern Honshu ⓘ |
| faultType | thrust fault ⓘ |
| follows | 1944 Tonankai earthquake in Nankai sequence ⓘ |
| intensityScale |
Japan Meteorological Observatory network
ⓘ
surface form:
JMA intensity scale
|
| location |
Nankai Trough
ⓘ
off the coast of southwestern Japan ⓘ |
| magnitude | 8.1 Mw ⓘ |
| magnitudeType | moment magnitude scale ⓘ |
| maximumIntensity | VIII (Severe) ⓘ |
| notableFor |
major casualties and destruction in Nankai coastal communities
ⓘ
widespread tsunami damage in southwestern Japan ⓘ |
| observedBy | Japan Meteorological Agency ⓘ |
| partOf | recurring Nankai Trough earthquake cycle ⓘ |
| plateInterface |
Philippine Sea Plate
ⓘ
surface form:
Philippine Sea Plate – Eurasian Plate
|
| precededBy | 1944 Tonankai earthquake ⓘ |
| recordedBy |
Global Seismographic Network
ⓘ
surface form:
global seismograph network
|
| regionAffected |
Ehime Prefecture
NERFINISHED
ⓘ
Hyogo Prefecture NERFINISHED ⓘ Kii Peninsula ⓘ Kochi Prefecture NERFINISHED ⓘ Nankai region ⓘ Osaka Prefecture ⓘ Shikoku ⓘ Tokushima Prefecture NERFINISHED ⓘ Wakayama Prefecture NERFINISHED ⓘ |
| sequence |
Nankai megathrust
ⓘ
surface form:
Nankai megathrust earthquakes
|
| tectonicSetting | subduction zone ⓘ |
| time | 04:19 JST ⓘ |
| triggered | tsunami ⓘ |
| tsunamiMaximumHeight | ~6 m ⓘ |
| year | 1946 ⓘ |
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: 1946 Nankai earthquake Description of subject: The 1946 Nankai earthquake was a powerful megathrust earthquake off the coast of southwestern Japan that generated a destructive tsunami and caused widespread damage and casualties in the Nankai region.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Nankai earthquake of 1946