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SPI — Seismic Probability Index

Major Historical Earthquakes

A reference list of 18 significant earthquakes in recorded history, all magnitude 7.0 or greater. These events shaped our understanding of seismic risk and the importance of early warning.

  1. 9.5Mag

    Great Chilean Earthquake

    Valdivia, ChileMay 22, 1960 • Fatalities: ~1,000–6,000

    The most powerful earthquake ever recorded. It triggered a Pacific-wide tsunami that struck Chile, Hawaii, Japan, and the Philippines.

  2. 9.2Mag

    Great Alaska (Good Friday) Earthquake

    Prince William Sound, AlaskaMarch 27, 1964 • Fatalities: ~131

    The most powerful earthquake in North American history. It caused massive ground deformation and destructive tsunamis along the Pacific coast.

  3. 9.1Mag

    Indian Ocean (Sumatra–Andaman) Earthquake

    Off Sumatra, IndonesiaDecember 26, 2004 • Fatalities: ~227,900

    One of the deadliest natural disasters in recorded history. The tsunami devastated coastlines across 14 countries around the Indian Ocean.

  4. 9.1Mag

    Tōhoku Earthquake

    Off the Pacific coast of Tōhoku, JapanMarch 11, 2011 • Fatalities: ~19,750

    Triggered a massive tsunami and the Fukushima Daiichi nuclear disaster. The most costly natural disaster in history.

  5. 9.0Mag

    Severo-Kurilsk Earthquake

    Kamchatka Peninsula, RussiaNovember 4, 1952 • Fatalities: ~2,300

    Generated a destructive tsunami that struck the Kuril Islands and crossed the Pacific to Hawaii.

  6. 8.8Mag

    Maule Earthquake

    Maule, ChileFebruary 27, 2010 • Fatalities: ~525

    One of the strongest earthquakes of the 21st century. The tsunami and shaking affected much of central Chile.

  7. 8.8Mag

    Ecuador–Colombia Earthquake

    Off the coast of EcuadorJanuary 31, 1906 • Fatalities: ~500–1,500

    Produced a strong tsunami that traveled across the Pacific, reaching Hawaii and Japan.

  8. 8.7Mag

    Rat Islands Earthquake

    Rat Islands, AlaskaFebruary 4, 1965 • Fatalities: 0

    A great earthquake in the Aleutian arc that generated a tsunami up to 10 meters on Shemya Island.

  9. 8.6Mag

    Nias–Simeulue Earthquake

    Northern Sumatra, IndonesiaMarch 28, 2005 • Fatalities: ~1,300

    Struck three months after the 2004 megaquake, devastating the islands of Nias and Simeulue.

  10. 8.6Mag

    Assam–Tibet Earthquake

    Assam, India / Tibet borderAugust 15, 1950 • Fatalities: ~4,800

    The largest known continental earthquake, causing enormous landslides across the eastern Himalayas.

  11. 8.6Mag

    Andreanof Islands Earthquake

    Andreanof Islands, AlaskaMarch 9, 1957 • Fatalities: 0

    Generated a Pacific-wide tsunami and destroyed two bridges on Adak Island; waves reached Hawaii.

  12. 8.6Mag

    Indian Ocean Earthquake

    Off Sumatra, IndonesiaApril 11, 2012 • Fatalities: ~10

    An unusually large strike-slip earthquake within the oceanic plate, rather than at a subduction zone.

  13. 7.9Mag

    Sichuan (Wenchuan) Earthquake

    Sichuan, ChinaMay 12, 2008 • Fatalities: ~87,600

    A catastrophic inland earthquake that caused widespread destruction and landslides across Sichuan province.

  14. 7.9Mag

    San Francisco Earthquake

    San Francisco, CaliforniaApril 18, 1906 • Fatalities: ~3,000

    Ruptured the San Andreas Fault and ignited fires that destroyed much of San Francisco.

  15. 7.8Mag

    Gorkha (Nepal) Earthquake

    Gorkha, NepalApril 25, 2015 • Fatalities: ~8,960

    Devastated the Kathmandu Valley and triggered avalanches on Mount Everest.

  16. 7.8Mag

    Turkey–Syria Earthquake

    Gaziantep, TurkeyFebruary 6, 2023 • Fatalities: ~59,200

    A doublet earthquake on the East Anatolian Fault that caused catastrophic damage across Turkey and Syria.

  17. 7.6Mag

    Tangshan Earthquake

    Tangshan, ChinaJuly 28, 1976 • Fatalities: ~242,000

    One of the deadliest earthquakes in history, it nearly leveled the industrial city of Tangshan.

  18. 7.0Mag

    Haiti Earthquake

    Léogâne, HaitiJanuary 12, 2010 • Fatalities: ~100,000–316,000

    Struck near the capital Port-au-Prince, causing immense loss of life and destroying much of the city's infrastructure.