Originally published: November 2016
Last updated: August 2026
Earthquakes are among the most destructive natural hazards on Earth. In a matter of seconds, violent ground movement can collapse buildings, damage roads and hospitals, trigger landslides, generate tsunamis and disrupt entire communities.
But there is an important distinction:
The strongest earthquake is not necessarily the deadliest earthquake.
The 1960 Valdivia earthquake in Chile remains the largest earthquake ever measured with modern instruments, at magnitude 9.5. Yet the 1556 Shaanxi earthquake in China, estimated at around magnitude 8, is widely regarded as the deadliest earthquake in recorded history.
Why can a smaller earthquake kill far more people than a larger one?
The answer involves much more than magnitude. Population density, earthquake depth, distance from communities, building quality, landslides, fires, tsunamis and emergency preparedness can all determine whether an earthquake becomes a major human disaster.
This article examines some of the strongest and deadliest earthquakes in history and, more importantly, what they teach us about earthquake risk.
What Is an Earthquake?
An earthquake occurs when accumulated stress within the Earth's crust causes rocks to suddenly break or move along a fault.
The sudden movement releases energy that travels through the Earth as seismic waves.
When those waves reach the surface, they can produce the shaking associated with an earthquake.
Many earthquakes occur near the boundaries between the enormous tectonic plates that make up the Earth's outer layer.
Some plate boundaries move apart, some slide past one another and others converge. Stress can build where these plates interact until rocks suddenly move.
Magnitude and Intensity Are Not the Same Thing
Two terms commonly used when discussing earthquakes are magnitude and intensity.
Magnitude describes the size of an earthquake and the energy released at its source.
Intensity describes the effects of the earthquake at a particular location, including how strongly people feel the shaking and the damage produced.
One earthquake therefore has a particular magnitude, but its intensity can vary considerably from place to place.
A community close to the earthquake may experience severe shaking while another location farther away experiences much weaker effects.
Modern large earthquakes are commonly described using moment magnitude, or Mw.
The magnitude scale is logarithmic. An increase of one whole magnitude represents approximately ten times greater measured wave amplitude and roughly 32 times more energy release.
This means a magnitude 9 earthquake is enormously more energetic than a magnitude 8 earthquake.
But greater energy does not automatically mean a greater death toll.
The Strongest Earthquakes Ever Recorded
Modern seismic instruments allow scientists to compare the magnitude of major earthquakes much more reliably than is possible for earthquakes that occurred centuries ago.
Among the largest instrumentally recorded earthquakes are:
| Earthquake | Date | Magnitude |
|---|---|---|
| Valdivia, Chile | 22 May 1960 | 9.5 |
| Prince William Sound, Alaska, USA | 28 March 1964 | 9.2 |
| Sumatra-Andaman | 26 December 2004 | 9.1 |
| Tōhoku, Japan | 11 March 2011 | 9.1 |
| Kamchatka, Russia | 4 November 1952 | 9.0 |
A massive magnitude 8.8 earthquake off Kamchatka in July 2025 also joined the small group of the largest earthquakes recorded by modern instruments.
These events demonstrate the enormous forces generated by movements of the Earth's tectonic plates.
1. Valdivia Earthquake, Chile, 1960
Magnitude: 9.5
The Great Chilean Earthquake, commonly called the Valdivia earthquake, struck southern Chile on 22 May 1960.
It remains the largest earthquake ever recorded by modern seismic instruments.
The earthquake caused widespread destruction in southern Chile and generated a major tsunami.
The tsunami did not remain confined to Chile.
It travelled across the Pacific Ocean and affected distant locations including Hawaii, Japan and the Philippines.
This demonstrates an important feature of very large undersea earthquakes: their consequences can extend thousands of kilometres beyond the area where the original earthquake occurs.
The Valdivia earthquake remains the standard against which the magnitude of other enormous earthquakes is often compared.
2. Prince William Sound Earthquake, Alaska, 1964
Magnitude: 9.2
On 28 March 1964, an enormous earthquake struck Alaska.
Often called the Great Alaska Earthquake, it remains the largest earthquake recorded in the United States and one of the strongest ever measured.
The earthquake produced several minutes of shaking, major ground deformation, landslides and tsunamis.
Despite its extraordinary magnitude, its death toll was far lower than those of several smaller earthquakes elsewhere.
Population exposure was one important reason.
This provides an excellent example of why earthquake magnitude alone cannot predict the human consequences of a disaster.
3. Sumatra-Andaman Earthquake and Indian Ocean Tsunami, 2004
Magnitude: 9.1
On 26 December 2004, a massive undersea earthquake occurred off northern Sumatra, Indonesia.
Movement of the seafloor displaced an enormous quantity of water and generated a catastrophic tsunami across the Indian Ocean.
Indonesia suffered the greatest losses, but devastating waves also struck countries including:
Sri Lanka
India
Thailand
Maldives
Somalia
The tsunami killed or left missing approximately 228,000 people across multiple countries.
More than one million people were displaced.
The disaster became one of the deadliest natural disasters of modern times.
It also exposed major gaps in tsunami detection and public-warning systems around the Indian Ocean.
The catastrophe subsequently accelerated efforts to improve regional tsunami monitoring, warning and preparedness.
4. Tōhoku Earthquake and Tsunami, Japan, 2011
Magnitude: 9.1
The Great East Japan Earthquake struck off the northeastern coast of Japan on 11 March 2011.
It was the strongest earthquake ever recorded in Japan.
Japan already had sophisticated earthquake-resistant construction, public preparedness programmes and earthquake-warning technology.
Yet the resulting tsunami was catastrophic.
Large waves overwhelmed coastal communities and caused extensive destruction.
More than 15,000 people were killed, with thousands more injured or reported missing.
The tsunami also caused the Fukushima Daiichi nuclear accident, creating another major emergency beyond the earthquake itself.
The disaster demonstrated that preparedness can greatly reduce risk but cannot eliminate it, particularly when an extreme event produces multiple hazards.
5. Kamchatka Earthquakes
Russia's Kamchatka Peninsula lies in one of the world's most seismically active regions.
A magnitude 9.0 earthquake occurred off Kamchatka in 1952, generating a Pacific-wide tsunami.
More recently, on 29 July 2025 UTC, another enormous earthquake struck offshore of the Kamchatka Peninsula.
The US Geological Survey measured the 2025 earthquake at magnitude 8.8, placing it among the largest earthquakes ever recorded by modern instruments.
The event generated tsunami warnings and advisories across parts of the Pacific.
The Kamchatka earthquakes illustrate why the Pacific region is responsible for many of the world's largest recorded earthquakes.
The Deadliest Earthquakes in History
Ranking earthquakes by deaths is more difficult than ranking modern earthquakes by magnitude.
For recent events, governments, researchers and disaster agencies can collect relatively detailed information.
For earthquakes that occurred centuries ago, estimates are reconstructed from historical records.
Figures for ancient disasters should therefore be treated as estimates rather than exact counts.
1. Shaanxi Earthquake, China, 1556
Estimated magnitude: approximately 8.0
Estimated deaths: about 830,000
The 1556 Shaanxi earthquake is widely regarded as the deadliest earthquake in recorded history.
It occurred during China's Ming dynasty and affected a large area of central China.
One important factor behind the extraordinary death toll was housing vulnerability.
Many people lived in structures known as yaodong, dwellings constructed within the region's soft loess deposits and cliffs.
Earthquake shaking caused extensive collapses and landslides.
The event occurred centuries before modern seismology, so both its magnitude and death toll are historical estimates.
Nevertheless, it provides one of history's clearest demonstrations that vulnerability can matter more than magnitude.
2. Tangshan Earthquake, China, 1976
Magnitude: approximately 7.6
Official deaths: approximately 242,000
The Tangshan earthquake struck the heavily populated industrial city of Tangshan in the early hours of 28 July 1976.
Many residents were asleep when buildings collapsed.
Homes, factories, roads and public infrastructure suffered enormous destruction.
China's official death toll was approximately 242,000, although some historical estimates have been higher.
The earthquake was substantially smaller than the magnitude 9 earthquakes recorded in Chile, Alaska, Sumatra and Japan.
Yet it killed far more people than some of those larger events.
Population concentration, vulnerable buildings and the timing of the earthquake contributed greatly to the disaster.
3. Indian Ocean Earthquake and Tsunami, 2004
The 2004 Sumatra-Andaman earthquake belongs on both lists.
It was simultaneously one of the strongest earthquakes ever measured and one of the deadliest disasters associated with an earthquake.
The majority of deaths resulted from the enormous tsunami rather than ground shaking alone.
This distinction matters because earthquake disasters frequently involve secondary hazards.
4. Haiti Earthquake, 2010
Magnitude: 7.0
The Haiti earthquake of 12 January 2010 provides one of the strongest examples of why magnitude cannot be used as a direct measure of disaster severity.
Magnitude 7.0 is very large, but far below the magnitude of the strongest earthquakes ever recorded.
Yet the earthquake occurred close to Port-au-Prince, where large numbers of people were exposed.
Homes, government buildings, hospitals, schools and essential infrastructure collapsed.
More than one million people were displaced.
The exact death toll remains disputed, with estimates varying substantially.
Weak construction, densely populated communities and limited emergency-response capacity contributed to the extraordinary scale of the disaster.
5. Great Kantō Earthquake, Japan, 1923
Magnitude: approximately 7.9
The Great Kantō earthquake devastated Tokyo, Yokohama and surrounding areas on 1 September 1923.
Structural collapse caused enormous damage, but another hazard became particularly important:
fire.
The earthquake struck around lunchtime, when many households were preparing food.
Fires spread through densely built areas containing many wooden structures.
More than 100,000 people were killed or reported missing.
The disaster had a lasting influence on urban planning and earthquake preparedness in Japan.
6. Messina Earthquake and Tsunami, Italy, 1908
Magnitude: approximately 7.1
On 28 December 1908, an earthquake struck the Strait of Messina between Sicily and mainland Italy.
Messina and Reggio Calabria suffered severe destruction.
A tsunami followed the earthquake and caused additional devastation along the coast.
Approximately 72,000 people are commonly reported to have died, although some historical estimates are higher.
Many residents were asleep when buildings collapsed.
The event remains one of Europe's deadliest earthquake disasters.
7. Wenchuan Earthquake, China, 2008
Magnitude: 7.9
The Wenchuan, or Sichuan, earthquake struck China on 12 May 2008.
Approximately 69,000 people were killed and more than 18,000 were reported missing.
Entire towns suffered severe damage.
The earthquake also triggered enormous landslides and blocked rivers, creating dangerous temporary lakes.
The collapse of schools became one of the most widely discussed aspects of the disaster and drew attention to the importance of construction quality in earthquake-prone areas.
8. Gorkha Earthquake, Nepal, 2015
Magnitude: 7.8
The Gorkha earthquake struck Nepal on 25 April 2015.
Kathmandu and many surrounding towns and villages suffered extensive damage.
Historic buildings collapsed, mountain communities became isolated and landslides blocked transportation routes.
Nearly 9,000 people were killed and more than 21,000 were injured.
The earthquake also triggered an avalanche on Mount Everest.
The disaster highlighted the vulnerability of traditional masonry structures that had not been designed to withstand major earthquakes.
Why Can a Smaller Earthquake Be Deadlier Than a Larger One?
This is perhaps the most important lesson from major earthquakes.
Magnitude measures the earthquake. It does not measure the disaster.
Several factors determine the eventual human impact.
1. Depth
Earthquakes occur at different depths below the Earth's surface.
Shallow earthquakes can produce severe surface shaking, particularly when they occur close to populated areas.
Depth alone does not determine damage, but it is an important part of the risk.
2. Distance From Population Centres
A huge earthquake far from densely populated communities may cause fewer deaths than a smaller earthquake directly beneath or beside a major city.
Exposure matters.
3. Population Density
More people living within the area of severe shaking means more people potentially exposed to collapsing buildings and other hazards.
4. Building Quality
Buildings are one of the most important determinants of earthquake deaths.
Structures designed and constructed to withstand seismic forces are generally much safer than poorly built masonry or concrete structures with little earthquake resistance.
An earthquake does not need to be record-breaking to become catastrophic when large numbers of vulnerable buildings collapse.
5. Time of Day
Timing can influence where people are when an earthquake occurs.
People may be:
Sleeping at home
Working in offices
Attending school
Travelling
Gathering in public places
The collapse of a heavily occupied structure can dramatically increase casualties.
6. Tsunamis
Large earthquakes beneath or near the ocean can suddenly displace the seafloor and generate tsunami waves.
The 2004 Indian Ocean and 2011 Japan disasters demonstrate how a tsunami can cause devastation far beyond the damage produced by shaking alone.
7. Landslides
Earthquake shaking can destabilise mountains and steep slopes.
Landslides may bury communities, destroy roads and isolate survivors from rescue services.
8. Fires
Broken electrical systems, damaged fuel lines and cooking fires can ignite after an earthquake.
When water supplies and roads are also damaged, controlling those fires becomes more difficult.
The 1923 Great Kantō earthquake demonstrated how devastating post-earthquake fires can become.
9. Emergency Response Capacity
The condition of:
Hospitals
Roads
Ambulance services
Fire services
Communications
Search-and-rescue systems
can affect survival after the earthquake.
A disaster can become worse when the same event that injures thousands of people also destroys the infrastructure needed to help them.
Earthquakes That Changed Disaster Preparedness
Some major earthquakes have influenced how countries prepare for future disasters.
The 2004 Indian Ocean Disaster and Tsunami Warning
The 2004 tsunami demonstrated the consequences of inadequate regional tsunami-warning capability.
After the disaster, governments and international organisations strengthened tsunami monitoring and warning systems across the Indian Ocean.
Early warning cannot stop a tsunami.
But even a relatively short warning can give people time to move away from exposed coastlines.
Japan and Earthquake-Resistant Construction
Japan experiences frequent earthquakes and has developed extensive systems involving:
Seismic building standards
Public education
Earthquake drills
Monitoring
Early warning
Tsunami preparedness
The 2011 disaster nevertheless demonstrated that preparedness must continue evolving as scientists learn more about extreme events.
Haiti and Vulnerable Infrastructure
The 2010 Haiti earthquake showed how building vulnerability and limited emergency capacity can transform a major earthquake into an enormous humanitarian disaster.
Safer construction is therefore not simply an engineering issue.
It is a public-safety and disaster-prevention intervention.
Can Scientists Predict Earthquakes?
Scientists cannot currently predict the exact date, time, location and magnitude of a major earthquake before it happens.
This is different from identifying risk.
Scientists can study:
Active faults
Historical earthquakes
Plate movement
Geological evidence
Seismic activity
to estimate where earthquakes are more likely to occur and the probability of future events.
But saying that a region has a high earthquake risk over the next several decades is not the same as predicting that an earthquake will happen at 2:00 p.m. next Tuesday.
Claims that someone can reliably predict the precise time and location of major earthquakes should therefore be treated with considerable caution.
Prediction and Earthquake Early Warning Are Different
Earthquake early-warning systems do not predict earthquakes before they begin.
Instead, they detect an earthquake after rupture has already started.
Electronic alerts can travel faster than the damaging seismic waves moving through the Earth.
Depending on a person's distance from the earthquake, this may provide seconds of warning.
Those seconds can still be useful.
They may allow:
Trains to slow
Industrial machinery to stop
Medical procedures to be secured
People to take protective action
The amount of warning varies and can be extremely short close to the earthquake's source.
What Should You Do During an Earthquake?
Earthquake safety depends partly on where you are when shaking begins.
If You Are Indoors
In many situations, the recommended action is:
DROP, COVER AND HOLD ON.
Drop to your hands and knees so the shaking does not knock you down.
Cover your head and neck, preferably beneath a strong table or desk.
Hold on to your shelter until the shaking stops.
Stay away from windows, glass and objects that could fall.
Do not automatically run outside during strong shaking. Falling glass, masonry and other debris near building exteriors can create additional danger.
Do not use lifts during an earthquake.
If You Are Outdoors
Move away from:
Buildings
Walls
Power lines
Trees
Streetlights
Other objects that could fall
Remain in an open area until the shaking stops.
If You Are Driving
Reduce speed safely and stop away from:
Bridges
Overpasses
Buildings
Trees
Power lines
Remain aware that roads may be damaged after the earthquake.
If You Are Near the Coast
A strong or prolonged earthquake near a coastline may be a natural tsunami warning.
When local authorities advise evacuation, move promptly toward higher ground or farther inland.
In areas at immediate tsunami risk, people should follow local emergency instructions rather than waiting unnecessarily for additional confirmation.
Can Major Earthquakes Happen in Africa?
Yes.
Africa experiences fewer of the world's extremely large earthquakes than the Pacific region, but the continent is not free from earthquake risk.
Important seismic regions include parts of:
North Africa
The Mediterranean margin
The Red Sea region
The East African Rift
The East African Rift System is particularly important because the Earth's crust is gradually being stretched and separated across parts of eastern Africa.
Countries within or near tectonically active regions can experience damaging earthquakes.
North Africa has also experienced destructive earthquakes associated with interactions between the African and Eurasian tectonic plates.
The lesson is simple:
Lower earthquake frequency does not mean zero earthquake risk.
Growing cities, vulnerable buildings and limited disaster preparedness can increase the consequences when earthquakes occur.
What Is the Pacific Ring of Fire?
Many of the world's largest earthquakes occur around the Pacific Ring of Fire.
This is a broad zone surrounding much of the Pacific Ocean where several tectonic plates interact.
It includes earthquake-prone regions around:
Japan
Indonesia
Philippines
Alaska
Russia's Kamchatka Peninsula
Western North America
Mexico
Central America
Chile
Other parts of the Pacific margin
The region is also associated with extensive volcanic activity.
This helps explain why countries such as Chile, Japan and Indonesia appear repeatedly in the history of major earthquakes.
Frequently Asked Questions
What is the strongest earthquake ever recorded?
The strongest earthquake measured with modern seismic instruments is the 1960 Valdivia earthquake in Chile, which had a magnitude of 9.5.
What was the deadliest earthquake in history?
The 1556 Shaanxi earthquake in China is widely regarded as the deadliest earthquake in recorded history, with an estimated death toll of approximately 830,000.
Because it occurred centuries before modern scientific records, the figure should be regarded as a historical estimate.
Is the strongest earthquake always the deadliest?
No.
Death and destruction depend on factors including population exposure, earthquake depth, building quality, secondary hazards and emergency preparedness.
Is a magnitude 9 earthquake ten times stronger than a magnitude 8?
The magnitude scale is logarithmic.
An increase of one magnitude represents approximately ten times greater measured wave amplitude and roughly 32 times greater energy release.
What is the difference between earthquake magnitude and intensity?
Magnitude describes the size of the earthquake at its source.
Intensity describes the severity of shaking and effects experienced at a particular location.
Can scientists predict earthquakes?
Scientists cannot currently predict the exact date, time, location and magnitude of a major earthquake.
They can identify earthquake-prone areas and estimate probabilities over longer periods.
Is earthquake early warning the same as prediction?
No.
Early-warning systems detect an earthquake after it has begun and attempt to send alerts before the strongest seismic waves reach locations farther away.
Can an earthquake cause a tsunami?
Yes.
Large undersea earthquakes can suddenly move the seafloor and displace enormous quantities of water, producing tsunami waves.
However, not every undersea earthquake generates a destructive tsunami.
Where do most of the world's largest earthquakes occur?
Many occur around the Pacific Ring of Fire, where several major tectonic plates interact.
Can major earthquakes happen in Africa?
Yes.
Earthquake-prone regions exist in North Africa, around the Red Sea and along the East African Rift System, among other areas.
What History's Greatest Earthquakes Teach Us
The history of earthquakes reveals something important about disasters:
A natural hazard does not determine the human outcome by itself.
The magnitude 9.5 Valdivia earthquake remains the strongest earthquake ever instrumentally recorded.
The much smaller 1556 Shaanxi earthquake is remembered as the deadliest.
The magnitude 7.0 Haiti earthquake devastated densely populated communities with vulnerable infrastructure.
The magnitude 9.1 Japanese earthquake occurred in one of the world's best-prepared countries, yet the resulting tsunami still produced catastrophic consequences.
And the 2004 Indian Ocean earthquake demonstrated how a disaster originating beneath the sea could affect communities across an entire ocean.
Earthquakes cannot currently be prevented or precisely predicted.
But their consequences can be reduced.
Earthquake-resistant buildings, sensible land-use planning, tsunami-warning systems, emergency preparedness, public education and effective rescue and healthcare systems can save lives.
The question is therefore not only:
How powerful will the next earthquake be?
It is also:
How prepared will the communities in its path be?
Key Takeaways
The 1960 Valdivia earthquake in Chile, at magnitude 9.5, remains the strongest earthquake recorded with modern instruments.
The 1556 Shaanxi earthquake in China is widely regarded as the deadliest earthquake in recorded history.
Magnitude measures the size of an earthquake, not the number of deaths it will cause.
Population exposure, building quality, earthquake depth, tsunamis, landslides, fires and emergency-response capacity strongly influence the human impact.
Scientists can estimate earthquake risk but cannot reliably predict the exact time and location of a major earthquake.
Earthquake early-warning systems detect earthquakes after they begin and may provide seconds of warning before strong shaking reaches some locations.
During strong shaking, Drop, Cover and Hold On is a widely recommended protective action for people indoors.
Africa is not free from earthquake risk, particularly in tectonically active areas such as the East African Rift and parts of North Africa.
Earthquakes cannot be stopped, but better preparation can prevent a natural hazard from becoming an even greater human catastrophe.
References and Further Reading
U.S. Geological Survey (USGS). 20 Largest Earthquakes in the World Since 1900.
https://www.usgs.gov/programs/earthquake-hazards/science/20-largest-earthquakes-world-1900
U.S. Geological Survey (USGS). Earthquake Facts and Earthquake Fantasy.
https://www.usgs.gov/programs/earthquake-hazards/earthquake-facts-earthquake-fantasy
U.S. Geological Survey (USGS). What should I do during an earthquake?
https://www.usgs.gov/faqs/what-should-i-do-during-earthquake
U.S. Geological Survey (USGS). The Great Alaska Earthquake and Tsunami of March 27, 1964.
https://www.usgs.gov/programs/earthquake-hazards/science/1964-great-alaska-earthquake-and-tsunami
National Centers for Environmental Information, NOAA. Global Historical Tsunami Database and Significant Tsunami Events.
https://www.ncei.noaa.gov/products/natural-hazards/tsunamis-earthquakes-volcanoes/tsunamis
U.S. Geological Survey (USGS). Earthquake Hazards Program.
https://earthquake.usgs.gov/
No comments:
Post a Comment