San Andreas Fault
E2244
The San Andreas Fault is a major tectonic boundary in California where the Pacific and North American plates meet, notorious for generating powerful earthquakes.
All labels observed (12)
How this entity was disambiguated
This entity first appeared as the object of triple T29470 — 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: San Andreas Fault Context triple: [1906 San Francisco earthquake, fault, San Andreas Fault]
-
A.
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.
-
B.
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.
-
C.
Sierra Nevada
Sierra Nevada is a major mountain range in the western United States known for its dramatic granite peaks, extensive forests, and iconic natural landmarks such as Yosemite National Park and Lake Tahoe.
-
D.
Central Valley
The Central Valley is a vast, fertile agricultural region in California that serves as one of the most productive farming areas in the world.
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E.
Coastal Ranges
The Coastal Ranges are a series of mountain ranges running along California’s Pacific coast, known for their rugged terrain, diverse ecosystems, and influence on the state’s climate and agriculture.
- 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: San Andreas Fault Target entity description: The San Andreas Fault is a major tectonic boundary in California where the Pacific and North American plates meet, notorious for generating powerful earthquakes.
-
A.
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.
-
B.
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.
-
C.
Sierra Nevada
Sierra Nevada is a major mountain range in the western United States known for its dramatic granite peaks, extensive forests, and iconic natural landmarks such as Yosemite National Park and Lake Tahoe.
-
D.
Central Valley
The Central Valley is a vast, fertile agricultural region in California that serves as one of the most productive farming areas in the world.
-
E.
Coastal Ranges
The Coastal Ranges are a series of mountain ranges running along California’s Pacific coast, known for their rugged terrain, diverse ecosystems, and influence on the state’s climate and agriculture.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
geological fault
ⓘ
plate boundary ⓘ strike-slip fault ⓘ transform fault ⓘ |
| averageSlipRate | about 20 to 35 millimeters per year ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| cumulativeOffset | hundreds of kilometers over millions of years ⓘ |
| discoveredBy | Andrew Lawson ⓘ |
| discoveryYear | 1895 ⓘ |
| formsBoundaryOf |
North American Plate
ⓘ
surface form:
North American Plate western margin in California
|
| geologicalAge | tens of millions of years ⓘ |
| governedBy | plate tectonics ⓘ |
| hasFeature |
fault scarps
ⓘ
linear valleys ⓘ offset streams ⓘ |
| hazardType | large earthquakes ⓘ |
| length |
about 1200 kilometers
ⓘ
about 750 miles ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
western United States ⓘ |
| maximumObservedOffset | several meters in single events ⓘ |
| monitoredBy | United States Geological Survey ⓘ |
| namedAfter | San Andreas Lake ⓘ |
| notableEarthquake |
1857 Fort Tejon earthquake
ⓘ
1906 San Francisco earthquake ⓘ 1989 Loma Prieta earthquake ⓘ |
| orientation | northwest–southeast ⓘ |
| partOf | Pacific Ring of Fire ⓘ |
| passesNear |
Los Angeles
ⓘ
San Francisco ⓘ |
| passesThrough |
Carrizo Plain
ⓘ
Coachella Valley ⓘ Mojave Desert ⓘ
surface form:
Mojave Desert region
Salton Sea ⓘ
surface form:
Salton Sea region
Transverse Ranges ⓘ
surface form:
San Bernardino Mountains region
San Francisco Peninsula ⓘ |
| region |
Coastal Ranges
ⓘ
surface form:
California Coast Ranges
Peninsular Ranges ⓘ Transverse Ranges ⓘ |
| relativeMotionType | right-lateral strike-slip ⓘ |
| riskTo |
Greater Los Angeles Area
ⓘ
surface form:
Greater Los Angeles area
San Francisco Bay Area ⓘ |
| segment |
central segment
ⓘ
northern segment ⓘ southern segment ⓘ |
| seismicZone |
San Andreas Fault
self-linksurface differs
ⓘ
surface form:
San Andreas Fault system
|
| tectonicPlateBoundaryBetween |
North American Plate
ⓘ
Pacific Plate ⓘ |
| terminusNear |
Cape Mendocino
ⓘ
Salton Sea ⓘ |
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: San Andreas Fault Description of subject: The San Andreas Fault is a major tectonic boundary in California where the Pacific and North American plates meet, notorious for generating powerful earthquakes.
Referenced by (76)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system vicinity
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas transform system
this entity surface form:
southern San Andreas Fault
this entity surface form:
San Andreas Fault system
this entity surface form:
southern San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
Big Bend of the San Andreas Fault
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas Fault system
this entity surface form:
San Andreas fault system
this entity surface form:
San Andreas Fault trace