1992 Cape Mendocino earthquakes
E68161
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 1992 Cape Mendocino earthquakes canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T545405 — 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: 1992 Cape Mendocino earthquakes Context triple: [Cape Mendocino, historicalEvent, 1992 Cape Mendocino earthquakes]
-
A.
1989 Loma Prieta earthquake
The 1989 Loma Prieta earthquake was a powerful magnitude 6.9 quake in Northern California that caused widespread damage in the San Francisco Bay Area, including freeway collapses and the disruption of the World Series.
-
B.
1906 San Francisco earthquake
The 1906 San Francisco earthquake was a devastating magnitude 7.8 seismic event that struck Northern California, causing widespread destruction and fires that nearly leveled San Francisco and became one of the worst natural disasters in U.S. history.
-
C.
Cascadia Subduction Zone
The Cascadia Subduction Zone is a major convergent plate boundary off the Pacific Northwest coast of North America, capable of generating powerful megathrust earthquakes and tsunamis.
-
D.
San Andreas Fault
The San Andreas Fault is a major tectonic boundary in California where the Pacific and North American plates meet, notorious for generating powerful earthquakes.
-
E.
Garlock Fault
The Garlock Fault is a major left-lateral strike-slip fault in southern California that forms the northern boundary of the Mojave Desert and plays a key role in the region’s complex tectonic 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: 1992 Cape Mendocino earthquakes Target entity description: 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.
-
A.
1989 Loma Prieta earthquake
The 1989 Loma Prieta earthquake was a powerful magnitude 6.9 quake in Northern California that caused widespread damage in the San Francisco Bay Area, including freeway collapses and the disruption of the World Series.
-
B.
1906 San Francisco earthquake
The 1906 San Francisco earthquake was a devastating magnitude 7.8 seismic event that struck Northern California, causing widespread destruction and fires that nearly leveled San Francisco and became one of the worst natural disasters in U.S. history.
-
C.
Cascadia Subduction Zone
The Cascadia Subduction Zone is a major convergent plate boundary off the Pacific Northwest coast of North America, capable of generating powerful megathrust earthquakes and tsunamis.
-
D.
San Andreas Fault
The San Andreas Fault is a major tectonic boundary in California where the Pacific and North American plates meet, notorious for generating powerful earthquakes.
-
E.
Garlock Fault
The Garlock Fault is a major left-lateral strike-slip fault in southern California that forms the northern boundary of the Mojave Desert and plays a key role in the region’s complex tectonic deformation.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
earthquake sequence
ⓘ
natural disaster ⓘ |
| affectedPlace |
Eureka, California
ⓘ
Ferndale, California ⓘ Humboldt County ⓘ
surface form:
Humboldt County, California
Petrolia, California ⓘ |
| casualties | 1 killed ⓘ |
| cause | subduction of the Gorda Plate beneath the North American Plate ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| damage |
landslides
ⓘ
road damage ⓘ severe damage in Petrolia ⓘ structural damage in Ferndale ⓘ |
| depthOfMainshock | about 10 km ⓘ |
| endDate | 1992-04-26 ⓘ |
| generatedTsunami | yes ⓘ |
| injuries | dozens injured ⓘ |
| intensityScale | Modified Mercalli intensity scale ⓘ |
| locatedIn |
Northern California
ⓘ
Pacific Ocean ⓘ offshore Cape Mendocino ⓘ |
| mainshockDate | 1992-04-25 ⓘ |
| mainshockMagnitude | 7.2 Mw ⓘ |
| mainshockTimeUTC | 1992-04-25T18:06:00Z ⓘ |
| maximumIntensity | VIII (Severe) ⓘ |
| maximumMagnitude | 7.2 Mw ⓘ |
| notableAftershocks | numerous ⓘ |
| numberOfMainEvents | 3 ⓘ |
| partOf |
California Coast Ranges seismicity
ⓘ
history of earthquakes in California ⓘ |
| recordedBy | United States Geological Survey ⓘ |
| region |
Pacific coast of North America
ⓘ
surface form:
Pacific Coast of the United States
|
| secondEventMagnitude | 6.5 Mw ⓘ |
| seismicHazardImpact | highlighted high seismic risk at Mendocino Triple Junction ⓘ |
| startDate | 1992-04-25 ⓘ |
| tectonicSetting |
Mendocino Triple Junction
ⓘ
boundary of Gorda Plate ⓘ boundary of North American Plate ⓘ boundary of Pacific Plate ⓘ |
| thirdEventMagnitude | 6.6 Mw ⓘ |
| triggeredFires | yes ⓘ |
| triggeredLandslides | yes ⓘ |
| tsunamiAffectedArea |
North Coast of California
ⓘ
surface form:
Northern California coast
Oregon Coast ⓘ
surface form:
Southern Oregon coast
|
| tsunamiHeightMaximum | about 1.1 m ⓘ |
| typeOfFaulting | thrust faulting ⓘ |
| year | 1992 ⓘ |
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: 1992 Cape Mendocino earthquakes Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.