The 2009 Samoa earthquake and tsunami took place on 29 September 2009 in the southern Pacific Ocean adjacent to the Tonga–Kermadec subduction zone. The submarine earthquake occurred in an extensional environment and had a moment magnitude of 8.1 and a maximum Mercalli intensity of VI (Strong). It was the largest earthquake of 2009. The earthquake initiated with a normal-faulting event with a magnitude of 8.1. Within two minutes of the earthquake rupture, two large magnitude 7.8 earthquakes occurred on the subduction zone interface. The two magnitude 7.8 earthquakes had a combined magnitude equivalent to 8.0. The event can be considered a doublet earthquake.
The 8.1 Mw Samoa earthquake results in a tsunami that kills over 189 and injures hundreds.
On September 29, in the year 2009, The 8.1 Mw Samoa earthquake results in a tsunami that kills over 189 and injures hundreds. This event is recorded as a Historical Events event in the history of September 29, one of 471 recorded events on this date across all of history.
Key Facts
- This event took place on September 29, 2009 (AD era).
- It is categorised as a Historical Events event in recorded history.
- Referenced in 1 Wikipedia article.
- The event is associated with a specific geographical location (see map below).
- Wikipedia source last updated on 16 August 2026.
On This Date in History 471
This article draws on content from Wikipedia, available under CC BY-SA 4.0.
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