2009 Samoa Islands earthquake and tsunami
E733764
The 2009 Samoa Islands earthquake and tsunami was a powerful undersea megathrust earthquake in the South Pacific that generated devastating tsunamis, causing significant loss of life and widespread destruction across Samoa, American Samoa, and nearby islands.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 2009 Samoa Islands earthquake and tsunami canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8436429 — 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: 2009 Samoa Islands earthquake and tsunami Context triple: [Niuatoputapu Island, experiencedEvent, 2009 Samoa Islands earthquake and tsunami]
-
A.
2010 Mentawai earthquake and tsunami
The 2010 Mentawai earthquake and tsunami was a powerful undersea megathrust event off western Sumatra that generated a destructive tsunami, killing hundreds of people and devastating coastal communities in the Mentawai Islands of Indonesia.
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B.
2005 Nias–Simeulue earthquake
The 2005 Nias–Simeulue earthquake was a powerful magnitude 8.6 megathrust earthquake off the coast of northern Sumatra that caused widespread destruction and significant casualties in Indonesia.
-
C.
2006 Kīholo Bay earthquake
The 2006 Kīholo Bay earthquake was a powerful undersea earthquake off the northwest coast of Hawaiʻi Island that caused widespread structural damage and power outages across the Hawaiian Islands.
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D.
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.
-
E.
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.
- 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: 2009 Samoa Islands earthquake and tsunami Target entity description: The 2009 Samoa Islands earthquake and tsunami was a powerful undersea megathrust earthquake in the South Pacific that generated devastating tsunamis, causing significant loss of life and widespread destruction across Samoa, American Samoa, and nearby islands.
-
A.
2010 Mentawai earthquake and tsunami
The 2010 Mentawai earthquake and tsunami was a powerful undersea megathrust event off western Sumatra that generated a destructive tsunami, killing hundreds of people and devastating coastal communities in the Mentawai Islands of Indonesia.
-
B.
2005 Nias–Simeulue earthquake
The 2005 Nias–Simeulue earthquake was a powerful magnitude 8.6 megathrust earthquake off the coast of northern Sumatra that caused widespread destruction and significant casualties in Indonesia.
-
C.
2006 Kīholo Bay earthquake
The 2006 Kīholo Bay earthquake was a powerful undersea earthquake off the northwest coast of Hawaiʻi Island that caused widespread structural damage and power outages across the Hawaiian Islands.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf | earthquake ⓘ |
| affectedArea |
Samoa Islands
NERFINISHED
ⓘ
Tutuila, American Samoa NERFINISHED ⓘ Upolu, Samoa NERFINISHED ⓘ |
| affectedCountry |
American Samoa
NERFINISHED
ⓘ
Samoa NERFINISHED ⓘ Tonga NERFINISHED ⓘ |
| alsoKnownAs |
2009 Samoa Islands earthquake
NERFINISHED
ⓘ
2009 Samoa earthquake NERFINISHED ⓘ 2009 Samoa tsunami NERFINISHED ⓘ |
| casualtiesTotal | about 189 deaths ⓘ |
| countryResponse |
Samoa declared a state of emergency
ⓘ
United States declared a major disaster in American Samoa ⓘ |
| damageType |
building collapse
ⓘ
coastal flooding ⓘ infrastructure destruction ⓘ road and bridge damage ⓘ |
| date | 2009-09-29 ⓘ |
| day | 29 ⓘ |
| deaths |
about 149 in Samoa
ⓘ
about 34 in American Samoa ⓘ at least 9 in Tonga ⓘ |
| displacedPeople | thousands ⓘ |
| economicImpact |
severe in American Samoa
ⓘ
severe in Samoa ⓘ severe in Tonga ⓘ |
| epicenterLocation | south of Samoa ⓘ |
| epicenterOcean | South Pacific Ocean NERFINISHED ⓘ |
| epicenterRegion | Samoa Islands region NERFINISHED ⓘ |
| faultType | megathrust ⓘ |
| generated | multiple tsunami waves ⓘ |
| injuries | hundreds ⓘ |
| internationalAid |
Australia provided assistance
ⓘ
New Zealand provided assistance ⓘ United States provided assistance ⓘ |
| magnitudeMoment | 8.1 ⓘ |
| magnitudeScale | Mw ⓘ |
| maximumMercalliIntensity | VI (Strong) ⓘ |
| monitoredBy |
Pacific Tsunami Warning Center
NERFINISHED
ⓘ
United States Geological Survey NERFINISHED ⓘ |
| month | September ⓘ |
| plateInvolved |
Indo-Australian Plate
NERFINISHED
ⓘ
Pacific Plate NERFINISHED ⓘ |
| primaryCauseOfDeath | tsunami ⓘ |
| relatedTo | Pacific Ring of Fire NERFINISHED ⓘ |
| tectonicSetting | subduction zone ⓘ |
| timeUTC | 17:48 ⓘ |
| triggered | tsunami ⓘ |
| tsunamiHeightMax | about 14 m ⓘ |
| waveArrivalTime | within minutes on nearby coasts ⓘ |
| year | 2009 ⓘ |
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: 2009 Samoa Islands earthquake and tsunami Description of subject: The 2009 Samoa Islands earthquake and tsunami was a powerful undersea megathrust earthquake in the South Pacific that generated devastating tsunamis, causing significant loss of life and widespread destruction across Samoa, American Samoa, and nearby islands.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.