Earthquake Case Studies
In-depth analyses of historically significant earthquakes — from geological causes to human impact and lessons learned.
The 2023 Turkey-Syria Earthquakes: A Double Mainshock That Killed 59,000
The deadliest earthquake disaster of the 2020s, notable for its unprecedented double mainshock sequence and the subsequent criminal prosecution of contractors for building code violations.
The 2018 Sulawesi Earthquake: Strike-Slip Tsunami and Catastrophic Liquefaction in Palu
The earthquake that defied three textbook rules: strike-slip faults generated a destructive tsunami, the rupture propagated at supershear speed, and liquefaction flows traveled 700 meters on nearly flat ground.
The 2017 Mexico City Earthquake: M7.1 on the Anniversary of the 1985 Disaster
Striking on the exact 32nd anniversary of the 1985 disaster during a national earthquake drill, the 2017 earthquake served as a live audit of Mexico City's three decades of seismic improvements.
The 2016 Kumamoto Earthquakes: A Double Mainshock That Rewrote Seismic Hazard Rules
The earthquake doublet that overturned the assumption that the first large shock is always the mainshock, forcing Japan to revise its public messaging and early warning protocols.
The 2015 Nepal Earthquake: When the Himalayas Shifted and Kathmandu Trembled
The earthquake that demonstrated the Himalayas' ongoing collision in real time, with GPS measurements showing Nepal shifted 3 meters south, while only partially releasing centuries of accumulated tectonic strain.
The 2011 Christchurch Earthquake: How a M6.2 Aftershock Destroyed a City Center
One of the few cases where an aftershock was more devastating than its mainshock, with a M6.2 at just 5 km depth producing 2.2g ground acceleration that obliterated Christchurch's city center.
The 2011 Tohoku Earthquake: How a M9.1 Megathrust Triggered Japan's Triple Disaster
The only earthquake in recorded history to trigger a simultaneous earthquake, tsunami, and nuclear disaster, fundamentally changing how nations assess cascading risk.
The 2010 Maule Earthquake: Chile's M8.8 Megathrust and the Power of Preparedness
The clearest modern comparison showing that building codes save lives -- a M8.8 earthquake in Chile killed 525 people while a M7.0 in Haiti (35 days earlier) killed 316,000.
The 2010 Haiti Earthquake: How a Magnitude 7.0 Killed 316,000 People
The deadliest earthquake relative to magnitude in modern history, demonstrating that building quality and governance -- not earthquake size -- determine whether people live or die.
The 2008 Sichuan Earthquake: 87,000 Dead Along the Longmenshan Fault
The earthquake that forced China to confront endemic building code violations after thousands of 'tofu-dreg' school buildings collapsed while adjacent government structures survived, killing over 5,000 children.
The 2005 Kashmir Earthquake: 87,000 Dead in the Himalayan Frontier
The deadliest Himalayan earthquake in modern history, which killed 17,000 students in collapsed schools and demonstrated the extreme difficulty of disaster response in remote mountainous terrain.
The 2004 Indian Ocean Tsunami: The Deadliest Earthquake Disaster of the 21st Century
The deadliest tsunami in modern history, killing 227,898 people across 14 countries, whose aftermath created the Indian Ocean Tsunami Warning System and transformed global disaster preparedness.
The 1999 Chi-Chi Earthquake: The Best-Recorded Near-Fault Earthquake in History
The best-instrumentally-recorded large earthquake in history, with 441 strong-motion stations capturing near-fault data that fundamentally changed how engineers design buildings close to active faults.
The 1999 Izmit Earthquake: North Anatolian Fault Rupture at Turkey's Industrial Heart
The latest in a remarkable 60-year westward migration of M7+ earthquakes along the North Anatolian Fault, with stress calculations now pointing directly at Istanbul for the next major rupture.
The 1995 Kobe Earthquake: The Disaster That Transformed Japan's Building Codes
The earthquake that exposed fatal weaknesses in Japan's pre-1981 building stock, leading to the most sweeping seismic engineering reforms in history and proving that building codes save lives.
The 1994 Northridge Earthquake: America's Most Expensive Seismic Event
America's most expensive earthquake, which revealed that thousands of modern welded steel moment-frame buildings had suffered hidden brittle fractures in their connections.
The 1989 Loma Prieta Earthquake: The World Series Quake That Woke Up California
America's first live-televised earthquake, broadcast to 62 million World Series viewers, whose Cypress Freeway collapse catalyzed California's seismic retrofit program for elevated highways.
The 1985 Mexico City Earthquake: The Resonance Disaster That Defied Distance
The definitive case study in site amplification and structural resonance, where lake-bed sediments selectively amplified 2-second seismic waves that destroyed mid-rise buildings 350 km from the epicenter.
The 1976 Tangshan Earthquake: The Deadliest Earthquake of the 20th Century
The deadliest earthquake of the 20th century, which destroyed 93% of an industrial city in seconds and exposed the limitations of earthquake prediction despite China's success at Haicheng one year earlier.
The 1970 Ancash Earthquake: The Deadliest Earthquake in South American History
The deadliest earthquake in South American history, where a 50-million-cubic-meter avalanche from Mount Huascaran traveled at 300 km/h to bury the town of Yungay, killing 92% of its population.
The 1964 Great Alaska Earthquake: The Second-Largest Earthquake Ever Recorded (M9.2)
The second-largest earthquake ever recorded and the event whose geological investigation by George Plafker provided critical field evidence for the then-controversial theory of plate tectonics.
The 1960 Valdivia Earthquake: The Most Powerful Earthquake Ever Recorded (M9.5)
The most powerful earthquake ever instrumentally recorded, releasing energy equivalent to 25% of all global seismic energy over a century and generating a tsunami that crossed the entire Pacific Ocean.
The 1950 Assam-Tibet Earthquake: The Largest Continental Earthquake Ever Recorded (M8.6)
The largest earthquake ever recorded in a purely continental setting, demonstrating that the Himalayan collision zone can produce M8.6+ earthquakes far from any ocean.
The 1948 Ashgabat Earthquake: The Soviet Catastrophe That Was Hidden for Decades
The most concealed earthquake disaster in history, where the Soviet government classified the true death toll of 110,000 as a state secret for 40 years.
The 1923 Great Kanto Earthquake: When Fire Destroyed Tokyo
The earthquake that proved fire -- not shaking -- is the primary killer in dense urban areas, with 38,000 people perishing in a single fire tornado.
The 1906 Ecuador-Colombia Earthquake: The M8.8 Megathrust That Defined the Northern Andes Hazard
The earthquake that established the segmented rupture model for subduction zones, as its 500 km rupture was partially re-ruptured in three subsequent earthquakes -- a textbook case of megathrust supercycles.
The 1906 San Francisco Earthquake: The Disaster That Launched Modern Seismology
The earthquake that founded modern seismology -- H.F. Reid's analysis of the 1906 rupture produced the elastic rebound theory, the fundamental explanation of why earthquakes occur.
The 1868 Arica Earthquake: The M9.0 Megathrust That Sent Tsunamis Across the Pacific
One of the most powerful earthquakes before the instrumental era, whose Pacific-wide tsunami carried warships half a kilometer inland and provided crucial calibration data for modern megathrust hazard models.
The 1755 Lisbon Earthquake: The Disaster That Shook the Enlightenment
The earthquake that launched both seismology as a science and modern emergency management, while simultaneously triggering a philosophical revolution.
The 1556 Shaanxi Earthquake: The Deadliest Earthquake in Human History (830,000 Dead)
The deadliest earthquake in human history, killing 830,000 people -- primarily because the population lived in cave dwellings carved into loess cliffs that collapsed en masse during the shaking.