WhereIsAtlas · Natural disaster
Moro Gulf Earthquake & Tsunami (1976)
The midnight earthquake and tsunami that killed about 8,000 across Mindanao's coast — the Philippines' deadliest quake
Concluded — A magnitude 7.9 earthquake struck the Moro Gulf near Mindanao in the early hours of 17 August 1976, spawning a tsunami that devastated over 700 km of coastline and killed approximately 8,000 people.
On 17 August 1976, a magnitude 7.9 earthquake struck beneath the Moro Gulf off the coast of Mindanao in the southern Philippines. It struck in the early hours, at night, when most residents were asleep — and it triggered a catastrophic tsunami that raced onto the nearby coastlines.
The tsunami devastated more than 700 kilometres of coastline, hitting communities across the region including those around Zamboanga, Cotabato and extensive parts of western Mindanao. The combination of the quake and the tsunami killed approximately 8,000 people and injured more than 10,000, making it the most disastrous earthquake ever recorded in the Philippines.
The 1976 Moro Gulf disaster remains a defining moment in Philippine natural-disaster history — a stark reminder of the seismic and tsunami risk that runs through the country, and one that directly informed later efforts to warn and protect coastal communities.
Quick facts
- Date
- August 17, 1976
- Magnitude
- ~7.9
- Location
- Moro Gulf, off Mindanao
- Tsunami
- Devastated 700+ km of coastline
- Deaths
- ~8,000
- Injured
- 10,000+
- Status
- The deadliest quake in Philippine history
Sources
- 1976 Midnight Killer: Remembering the deadly 8-magnitude quake in Mindanao — BARMM Official (2026-09-04)
- Moro Gulf earthquake (1976) - Wikipedia — Wikipedia (2026-09-04)
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