Hayward Fault
E96858
The Hayward Fault is a major geologic fault in the San Francisco Bay Area known for its high seismic risk and potential to generate powerful earthquakes.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Hayward Fault canonical | 7 |
| Hayward–Rodgers Creek fault zone | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T808713 — 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: Hayward Fault Context triple: [California Memorial Stadium, builtNear, Hayward Fault]
-
A.
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.
-
B.
Queen Charlotte Fault
The Queen Charlotte Fault is a major transform fault off the Pacific Northwest coast that marks the tectonic boundary between the Pacific and North American Plates and is a significant source of earthquakes in the region.
-
C.
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.
-
D.
San Jacinto Fault Zone
The San Jacinto Fault Zone is a major active strike-slip fault system in Southern California that accommodates a significant portion of the region’s tectonic motion and poses substantial earthquake hazard.
-
E.
Nootka Fault
Nootka Fault is a major transform fault off the coast of British Columbia that separates segments of the Explorer Plate and plays a key role in the tectonics of the Cascadia subduction zone.
- 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: Hayward Fault Target entity description: The Hayward Fault is a major geologic fault in the San Francisco Bay Area known for its high seismic risk and potential to generate powerful earthquakes.
-
A.
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.
-
B.
Queen Charlotte Fault
The Queen Charlotte Fault is a major transform fault off the Pacific Northwest coast that marks the tectonic boundary between the Pacific and North American Plates and is a significant source of earthquakes in the region.
-
C.
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.
-
D.
San Jacinto Fault Zone
The San Jacinto Fault Zone is a major active strike-slip fault system in Southern California that accommodates a significant portion of the region’s tectonic motion and poses substantial earthquake hazard.
-
E.
Nootka Fault
Nootka Fault is a major transform fault off the coast of British Columbia that separates segments of the Explorer Plate and plays a key role in the tectonics of the Cascadia subduction zone.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
geologic fault
ⓘ
right-lateral fault ⓘ strike-slip fault ⓘ |
| causes |
ground rupture
ⓘ
surface creep ⓘ |
| cityMostAtRisk |
Berkeley, California
ⓘ
linked to:
Berkeley
Fremont, California ⓘ
linked to:
Fremont
Hayward, California ⓘ
linked to:
Hayward
Oakland, California ⓘ
linked to:
Oakland
|
| connectedTo | Rodgers Creek Fault ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| hazardTo | critical infrastructure in the East Bay ⓘ |
| hazardType |
earthquake
ⓘ
surface fault rupture ⓘ |
| includedIn | USGS National Seismic Hazard Model ⓘ |
| knownFor |
high seismic hazard
ⓘ
potential to generate powerful earthquakes ⓘ |
| lastMajorEarthquakeMagnitudeApprox | 6.8–7.0 ⓘ |
| lastMajorEarthquakeName | 1868 Hayward earthquake ⓘ |
| lastMajorEarthquakeYear | 1868 ⓘ |
| lengthApproxKm | ~119 ⓘ |
| locatedIn |
Northern California
ⓘ
San Francisco Bay Area ⓘ |
| monitoredBy |
California Geological Survey
ⓘ
linked to:
California Department of Conservation
United States Geological Survey ⓘ |
| near | San Francisco, California ⓘ |
| notableEvent | 1868 Hayward earthquake ⓘ |
| observedPhenomenon | aseismic creep ⓘ |
| orientationGeneral | northwest–southeast ⓘ |
| parallelTo | San Andreas Fault ⓘ |
| partOf |
San Andreas Fault system
ⓘ
linked to:
San Andreas Fault
|
| passesUnder |
California Memorial Stadium
ⓘ
University of California, Berkeley campus ⓘ
linked to:
UC Berkeley campus
|
| plateOnEastSide | North American Plate ⓘ |
| plateOnWestSide | Pacific Plate ⓘ |
| recurrenceIntervalEstimateYears | ~140 ⓘ |
| regionPopulationExposed | millions of people ⓘ |
| relativeMotion | right-lateral strike-slip ⓘ |
| runsThrough |
Berkeley, California
ⓘ
linked to:
Berkeley
East Bay ⓘ Fremont, California ⓘ
linked to:
Fremont
Hayward, California ⓘ
linked to:
Hayward
Oakland, California ⓘ
linked to:
Oakland
San Leandro, California ⓘ
linked to:
San Leandro
Union City, California ⓘ |
| segmentOf |
Hayward–Rodgers Creek fault zone
ⓘ
linked to:
Hayward Fault
|
| seismicRiskLevel | high ⓘ |
| slipRateApproxMmPerYear | ~9 ⓘ |
| tectonicSetting | transform plate boundary ⓘ |
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: Hayward Fault Description of subject: The Hayward Fault is a major geologic fault in the San Francisco Bay Area known for its high seismic risk and potential to generate powerful earthquakes.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.