1964 Alaska earthquake
E831843
The 1964 Alaska earthquake was a massive magnitude 9.2 megathrust quake—the second-largest ever recorded—that devastated parts of southern Alaska and triggered widespread tsunamis across the Pacific.
All labels observed (3)
| Label | Occurrences |
|---|---|
| 1964 Alaska earthquake canonical | 3 |
| 1964 Alaska earthquake and tsunami | 2 |
| 1964 Good Friday earthquake | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9970850 — 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: 1964 Alaska earthquake Context triple: [Pacific–North American plate boundary system, notableEarthquake, 1964 Alaska earthquake]
-
A.
1949 Queen Charlotte Islands earthquake
The 1949 Queen Charlotte Islands earthquake was a powerful magnitude 8.1 megathrust event off the coast of British Columbia, Canada, that ranks among the largest recorded earthquakes in North America.
-
B.
1967 Mudurnu Valley earthquake
The 1967 Mudurnu Valley earthquake was a major and destructive seismic event in northwestern Turkey that ruptured a segment of the North Anatolian Fault, causing significant damage and casualties.
-
C.
2006 Kīholo Bay earthquake
The 2006 Kīholo Bay earthquake was a powerful undersea earthquake off the northwest coast of Hawaiʻi Island that caused widespread structural damage and power outages across the Hawaiian Islands.
-
D.
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.
-
E.
1960 Valdivia earthquake
The 1960 Valdivia earthquake was the most powerful earthquake ever recorded, a magnitude 9.5 megathrust event that devastated southern Chile and triggered tsunamis across the Pacific.
- 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: 1964 Alaska earthquake Target entity description: The 1964 Alaska earthquake was a massive magnitude 9.2 megathrust quake—the second-largest ever recorded—that devastated parts of southern Alaska and triggered widespread tsunamis across the Pacific.
-
A.
1949 Queen Charlotte Islands earthquake
The 1949 Queen Charlotte Islands earthquake was a powerful magnitude 8.1 megathrust event off the coast of British Columbia, Canada, that ranks among the largest recorded earthquakes in North America.
-
B.
1967 Mudurnu Valley earthquake
The 1967 Mudurnu Valley earthquake was a major and destructive seismic event in northwestern Turkey that ruptured a segment of the North Anatolian Fault, causing significant damage and casualties.
-
C.
2006 Kīholo Bay earthquake
The 2006 Kīholo Bay earthquake was a powerful undersea earthquake off the northwest coast of Hawaiʻi Island that caused widespread structural damage and power outages across the Hawaiian Islands.
-
D.
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.
-
E.
1960 Valdivia earthquake
The 1960 Valdivia earthquake was the most powerful earthquake ever recorded, a magnitude 9.5 megathrust event that devastated southern Chile and triggered tsunamis across the Pacific.
- F. None of above. chosen
Statements (57)
| Predicate | Object |
|---|---|
| instanceOf |
megathrust earthquake
ⓘ
natural disaster ⓘ tsunami-generating earthquake ⓘ |
| affectedArea |
Anchorage
NERFINISHED
ⓘ
Kenai Peninsula NERFINISHED ⓘ Kodiak Island NERFINISHED ⓘ Prince William Sound region NERFINISHED ⓘ Seward NERFINISHED ⓘ Valdez NERFINISHED ⓘ Whittier NERFINISHED ⓘ southern Alaska NERFINISHED ⓘ |
| alsoKnownAs |
Good Friday Earthquake
NERFINISHED
ⓘ
Great Alaska Earthquake NERFINISHED ⓘ |
| casualties | approximately 131 deaths ⓘ |
| category |
1964 disasters in the United States
ⓘ
Earthquakes in Alaska NERFINISHED ⓘ Megathrust earthquakes ⓘ Tsunamis in the United States ⓘ |
| caused |
land subsidence in coastal Alaska
ⓘ
uplift of some coastal areas ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| date | 1964-03-27 ⓘ |
| dayOfWeek | Friday ⓘ |
| deathsFromTsunami | majority of total deaths ⓘ |
| durationOfStrongShaking | approximately 4.5 minutes ⓘ |
| economicLosses | hundreds of millions of 1964 U.S. dollars ⓘ |
| epicenterNear |
College Fjord
NERFINISHED
ⓘ
Valdez NERFINISHED ⓘ |
| ledTo |
changes in U.S. building codes
ⓘ
creation of the National Earthquake Information Center ⓘ |
| locatedIn |
Alaska
ⓘ
Prince William Sound NERFINISHED ⓘ |
| magnitude | 9.2 ⓘ |
| maximumMercalliIntensity | XI ⓘ |
| maximumMercalliIntensityDescription | Extreme ⓘ |
| momentMagnitudeScale | 9.2 ⓘ |
| notableFor |
extreme duration and magnitude
ⓘ
widespread ground deformation ⓘ |
| occurredOnFault | Aleutian Megathrust NERFINISHED ⓘ |
| occurredOnPlateBoundary | Pacific Plate–North American Plate boundary NERFINISHED ⓘ |
| partOf | history of Alaska ⓘ |
| rankByMagnitude | second-largest earthquake ever instrumentally recorded ⓘ |
| ruptureType | megathrust ⓘ |
| studiedBy | United States Geological Survey NERFINISHED ⓘ |
| tectonicSetting | subduction zone ⓘ |
| timeLocal | 1964-03-27T17:36:00-09:00 ⓘ |
| timeUTC | 1964-03-28T03:36:00Z ⓘ |
| triggered |
soil liquefaction
ⓘ
submarine landslides ⓘ tsunamis ⓘ |
| tsunamiAffectedArea |
British Columbia coast
NERFINISHED
ⓘ
Gulf of Alaska NERFINISHED ⓘ Hawaii NERFINISHED ⓘ Japan NERFINISHED ⓘ U.S. West Coast NERFINISHED ⓘ |
| tsunamiMaximumRunupInAlaska | approximately 67 meters ⓘ |
| tsunamiMaximumRunupLocation | Shoup Bay, Alaska NERFINISHED ⓘ |
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: 1964 Alaska earthquake Description of subject: The 1964 Alaska earthquake was a massive magnitude 9.2 megathrust quake—the second-largest ever recorded—that devastated parts of southern Alaska and triggered widespread tsunamis across the Pacific.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
1964 Alaska earthquake and tsunami
this entity surface form:
1964 Good Friday earthquake
this entity surface form:
1964 Alaska earthquake and tsunami