1994 Northridge earthquake
E538747
The 1994 Northridge earthquake was a powerful and destructive magnitude 6.7 earthquake that struck the Los Angeles area of Southern California on January 17, 1994, causing widespread damage and loss of life.
All labels observed (2)
| Label | Occurrences |
|---|---|
| 1994 Northridge earthquake canonical | 2 |
| Northridge earthquake | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5611214 — 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: 1994 Northridge earthquake Context triple: [Ronald Reagan UCLA Medical Center, builtAfter, 1994 Northridge earthquake]
-
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.
Loma Prieta
Loma Prieta is a prominent peak in California’s Santa Cruz Mountains, best known for lending its name to the devastating 1989 Loma Prieta earthquake.
-
C.
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.
-
D.
1868 Hayward earthquake
The 1868 Hayward earthquake was a powerful and destructive seismic event that struck the San Francisco Bay Area in California, causing extensive damage and loss of life and serving as a key historical benchmark for seismic risk on the Hayward Fault.
-
E.
1968 Borrego Mountain earthquake
The 1968 Borrego Mountain earthquake was a powerful magnitude 6.5–6.8 temblor in Southern California that caused significant surface rupture and damage, and became an important case study in modern seismology and fault mechanics.
- 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: 1994 Northridge earthquake Target entity description: The 1994 Northridge earthquake was a powerful and destructive magnitude 6.7 earthquake that struck the Los Angeles area of Southern California on January 17, 1994, causing widespread damage and loss of life.
-
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.
Loma Prieta
Loma Prieta is a prominent peak in California’s Santa Cruz Mountains, best known for lending its name to the devastating 1989 Loma Prieta earthquake.
-
C.
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.
-
D.
1868 Hayward earthquake
The 1868 Hayward earthquake was a powerful and destructive seismic event that struck the San Francisco Bay Area in California, causing extensive damage and loss of life and serving as a key historical benchmark for seismic risk on the Hayward Fault.
-
E.
1968 Borrego Mountain earthquake
The 1968 Borrego Mountain earthquake was a powerful magnitude 6.5–6.8 temblor in Southern California that caused significant surface rupture and damage, and became an important case study in modern seismology and fault mechanics.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf | earthquake ⓘ |
| affectedArea |
Los Angeles
ⓘ
San Fernando Valley ⓘ Santa Monica ⓘ Simi Valley ⓘ
linked to:
Simi Valley, California
Ventura County ⓘ |
| aftershocks | thousands of aftershocks over subsequent months ⓘ |
| alsoKnownAs |
Northridge earthquake
ⓘ
linked to:
1994 Northridge earthquake
|
| casualtiesDeaths | approximately 57 ⓘ |
| casualtiesInjured | over 8,700 ⓘ |
| category |
1994 disasters in the United States
ⓘ
Earthquakes in California ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| date | 1994-01-17 ⓘ |
| depth | approximately 19 km ⓘ |
| displacedPeople | tens of thousands ⓘ |
| economicDamage |
one of the costliest earthquakes in U.S. history
ⓘ
over 20 billion US dollars ⓘ |
| epicenter |
Northridge, Los Angeles, California
ⓘ
linked to:
Northridge
|
| faultType | blind thrust fault ⓘ |
| impact |
damage to hospitals and schools
ⓘ
disruption of transportation networks ⓘ major damage to soft-story apartment buildings ⓘ major damage to unreinforced masonry buildings ⓘ widespread power outages ⓘ |
| localTime | 04:30 PST ⓘ |
| locatedIn |
Los Angeles metropolitan area
ⓘ
linked to:
Greater Los Angeles Area
Southern California ⓘ |
| magnitude | 6.7 ⓘ |
| magnitudeScale | moment magnitude scale ⓘ |
| maximumMercalliIntensity | IX (Violent) ⓘ |
| notableInfrastructureDamage |
collapse of portions of Interstate 5
ⓘ
collapse of portions of State Route 14 ⓘ damage to Los Angeles freeway system ⓘ damage to Santa Monica Freeway (Interstate 10) ⓘ |
| policyImpact |
influenced hospital seismic safety regulations in California
ⓘ
led to revisions of California building codes ⓘ led to strengthening of seismic design standards in Los Angeles ⓘ spurred retrofitting of freeway overpasses and bridges ⓘ |
| precededBy | 1992 Landers earthquake (regional context) ⓘ |
| record | one of the strongest earthquakes to hit urban Los Angeles in the 20th century ⓘ |
| regionTectonics | occurred within the Pacific–North American plate boundary region ⓘ |
| scientificSignificance | prompted major research on blind thrust faults ⓘ |
| seismologicalOrganization | recorded and studied by the United States Geological Survey ⓘ |
| timeZone |
Pacific Standard Time
ⓘ
linked to:
Pacific Time Zone
|
| triggered |
fires
ⓘ
freeway collapses ⓘ landslides ⓘ widespread building collapses ⓘ |
| year | 1994 ⓘ |
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: 1994 Northridge earthquake Description of subject: The 1994 Northridge earthquake was a powerful and destructive magnitude 6.7 earthquake that struck the Los Angeles area of Southern California on January 17, 1994, causing widespread damage and loss of life.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: 1994 Northridge earthquake