1949 Queen Charlotte Islands earthquake
E196200
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 1949 Queen Charlotte Islands earthquake canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1755768 — 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: 1949 Queen Charlotte Islands earthquake Context triple: [Queen Charlotte Fault, notableEarthquake, 1949 Queen Charlotte Islands earthquake]
-
A.
1992 Cape Mendocino earthquakes
The 1992 Cape Mendocino earthquakes were a sequence of powerful offshore quakes near Northern California that caused significant shaking, damage, and a small tsunami along the Pacific coast.
-
B.
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.
-
C.
1927 Crimean earthquake
The 1927 Crimean earthquake was a powerful seismic event in the Black Sea region that caused significant damage across Crimea and nearby areas.
-
D.
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.
-
E.
2004 Indian Ocean earthquake and tsunami
The 2004 Indian Ocean earthquake and tsunami was a massive undersea megathrust earthquake off the coast of Sumatra that triggered devastating tsunamis across the Indian Ocean, killing over 200,000 people and becoming one of the deadliest natural disasters in recorded history.
- 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: 1949 Queen Charlotte Islands earthquake Target entity description: 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.
-
A.
1992 Cape Mendocino earthquakes
The 1992 Cape Mendocino earthquakes were a sequence of powerful offshore quakes near Northern California that caused significant shaking, damage, and a small tsunami along the Pacific coast.
-
B.
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.
-
C.
1927 Crimean earthquake
The 1927 Crimean earthquake was a powerful seismic event in the Black Sea region that caused significant damage across Crimea and nearby areas.
-
D.
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.
-
E.
2004 Indian Ocean earthquake and tsunami
The 2004 Indian Ocean earthquake and tsunami was a massive undersea megathrust earthquake off the coast of Sumatra that triggered devastating tsunamis across the Indian Ocean, killing over 200,000 people and becoming one of the deadliest natural disasters in recorded history.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
earthquake
ⓘ
interplate earthquake ⓘ megathrust earthquake ⓘ |
| casualties | 0 direct deaths reported ⓘ |
| continent | North America ⓘ |
| country | Canada ⓘ |
| currentRegionName | Haida Gwaii ⓘ |
| damage | moderate structural damage in Queen Charlotte Islands communities ⓘ |
| date | 1949-08-22 ⓘ |
| day | 22 ⓘ |
| epicenterRegion |
Haida Gwaii
ⓘ
surface form:
Haida Gwaii region
Haida Gwaii ⓘ
surface form:
Queen Charlotte Islands
off the west coast of Graham Island ⓘ |
| faultType | strike-slip ⓘ |
| feltIn |
Alaska
ⓘ
British Columbia ⓘ Oregon ⓘ Washington State, United States ⓘ
surface form:
Washington State
Western Canada ⓘ
surface form:
western Canada
|
| followedBy | 1964 Alaska earthquake ⓘ |
| locatedIn |
Pacific Northwest
ⓘ
Queen Charlotte Fault ⓘ
surface form:
Queen Charlotte Fault zone
off the coast of British Columbia ⓘ |
| magnitude | 8.1 ⓘ |
| maximumMercalliIntensity | VIII ⓘ |
| maximumMercalliIntensityDescription | Severe ⓘ |
| momentMagnitudeScale | 8.1 ⓘ |
| month | August ⓘ |
| notableFeature |
among the largest instrumentally recorded strike-slip earthquakes
ⓘ
long strike-slip rupture along the Queen Charlotte Fault ⓘ |
| plate1 | Pacific Plate ⓘ |
| plate2 | North American Plate ⓘ |
| precededBy | 1946 Vancouver Island earthquake ⓘ |
| rankAmongNorthAmericanEarthquakes | one of the largest recorded earthquakes in North America ⓘ |
| rankInCanada | one of the largest recorded earthquakes in Canadian history ⓘ |
| recordedBy |
Canadian seismological networks
ⓘ
United States Geological Survey ⓘ |
| regionNameAtTime |
Haida Gwaii
ⓘ
surface form:
Queen Charlotte Islands
|
| ruptureLength | approximately 500 km ⓘ |
| ruptureType | right-lateral strike-slip ⓘ |
| surfaceWaveMagnitude | 8.1 ⓘ |
| tectonicSetting |
boundary between the Pacific Plate and the North American Plate
ⓘ
transform plate boundary ⓘ |
| timeLocal | 1949-08-21 late evening local time ⓘ |
| timeUTC | 1949-08-22T08:01:00Z ⓘ |
| tsunami | yes ⓘ |
| tsunamiGenerationMechanism | seafloor displacement along plate boundary ⓘ |
| year | 1949 ⓘ |
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: 1949 Queen Charlotte Islands earthquake Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.