The best defense against earthquakes is a combination of structural preparedness, immediate protective action, and advance planning. No single measure works alone. Countries with modern seismic building codes experience dramatically fewer deaths from earthquakes of the same magnitude, and individuals who practice proven safety responses and prepare their homes in advance fare significantly better than those who don’t.
Building Codes Save the Most Lives
At a population level, enforced building codes are the single most powerful defense against earthquake fatalities. Over the past decade, high-income countries with advanced building code systems experienced 47 percent of disasters globally yet accounted for only 7 percent of disaster fatalities. The contrast becomes stark when you compare individual events: in 2003, two earthquakes of similar magnitude struck within three days of each other, one in Paso Robles, California, and one in Bam, Iran. Two people died in Paso Robles. More than 40,000 died in Bam, nearly half the city’s population.
The difference wasn’t geology or luck. It was construction standards. Modern seismic codes require buildings to absorb and distribute shaking forces rather than crumbling under them. If you’re buying or renting a home in an earthquake-prone area, the age and construction type of the building matters enormously. Homes built to post-1970s seismic standards in the U.S. are far more likely to remain standing during strong shaking. Older unreinforced masonry buildings, common in many cities, are among the most dangerous structures in a quake.
How Modern Buildings Resist Shaking
Engineers use several technologies to protect structures from seismic forces. The most well-known is base isolation, where a building sits on flexible bearings that absorb ground motion rather than transmitting it directly into the structure above. Think of it like a building floating on shock absorbers. Hospitals, government buildings, and critical infrastructure in earthquake zones often use this approach.
Beyond base isolation, buildings can incorporate damping systems that work like giant versions of a car’s shock absorbers, converting the energy of shaking into heat and dissipating it. Newer systems combine these passive technologies with active components that adjust in real time to the specific pattern of shaking, along with sensors connected to earthquake early warning networks that can pre-activate protective mechanisms before the strongest waves arrive.
Drop, Cover, and Hold On
When shaking starts, your immediate physical response is your most important personal defense. Federal, state, and local emergency management experts universally agree that “Drop, Cover, and Hold On” is the best action to reduce injury and death. Running outside, standing in a doorway, and the so-called “triangle of life” are all considered dangerous or outdated.
The reason is straightforward: in U.S. earthquakes over the last several decades, people are far more likely to be injured by falling or flying objects (televisions, lamps, glass, bookcases) than to die in a collapsed building. Strong shaking can jerk the floor sideways several feet per second, making it nearly impossible to run or even crawl. If you try to move, you’ll likely be knocked down in an uncontrolled way.
The correct sequence: drop to your hands and knees immediately (this keeps you from being thrown down), cover your head and neck with one arm, and crawl under a sturdy table or desk if one is nearby. If not, get next to an interior wall and bend over to protect your vital organs. Hold on to your shelter with one hand, because it may shift during shaking. If you have no shelter at all, cover your head and neck with both arms and stay down until the shaking stops. Don’t wait to gauge how strong the earthquake will be. Act immediately.
Early Warning Systems
The USGS ShakeAlert system, now active along the West Coast, detects earthquakes and sends alerts before the strongest shaking arrives. The warning window is typically seconds to tens of seconds, which sounds short but is enough time to drop and take cover, for trains to begin braking, for hospital operating rooms to pause procedures, and for automated systems to open firehouse doors or shut down industrial equipment.
ShakeAlerts are sent to hospitals, schools, public transportation operators, emergency responders, and municipal water managers, all of whom have developed specific protocols for using those precious seconds. For individuals, the alerts arrive through the Wireless Emergency Alert system on your phone. Make sure your phone’s emergency alerts are enabled.
Preventing Fires and Gas Leaks
Fire is the most dangerous secondary hazard after an earthquake. Ruptured gas lines and downed electrical wires are the primary ignition sources, and post-quake fires can cause more destruction than the shaking itself. The key prevention step is cutting off gas and electricity as quickly as possible after shaking stops.
California requires earthquake-sensitive gas shutoff valves to be tested and certified by the State Architect before installation. These valves automatically close when they detect seismic shaking above a certain threshold, preventing gas from flowing into a damaged building. If you live in an earthquake zone, installing a certified automatic gas shutoff valve is one of the highest-value upgrades you can make to your home. Even without an automatic valve, know where your manual gas shutoff is and keep a wrench nearby.
After shaking stops, close doors to rooms where fire could spread, and don’t use open flames or turn electrical switches on or off until you’re sure there are no gas leaks.
Stabilizing the Ground Itself
Some of the worst earthquake damage happens not because buildings are poorly built but because the ground beneath them fails. Soil liquefaction occurs when saturated, loose soil loses its strength during shaking and behaves like a liquid, causing buildings to sink, tilt, or collapse even if their structure is sound.
Engineers address this with ground improvement techniques. Stone columns, where gravel is driven deep into the soil in vertical columns, densify the surrounding ground and provide drainage that prevents water pressure from building up. Soil-cement columns mix cement directly into liquefiable soil, increasing its shear strength and stiffness. A newer biological approach called biocementation uses bacteria to precipitate calcium carbonate within sandy soil, essentially turning loose sand into a rock-like material. These methods are used under embankments, foundations, and critical infrastructure in liquefaction-prone areas.
For homeowners, understanding your local soil type matters. If your property sits on fill, reclaimed land, or near a waterfront, liquefaction risk is higher. Many cities publish liquefaction hazard maps you can check for free.
Preparing Your Home and Kit
Securing your living space before an earthquake hits is a defense you control entirely. Anchor tall bookcases, water heaters, and heavy appliances to wall studs. Move heavy objects to lower shelves. Use museum putty or straps to secure TVs and monitors. These are the objects most likely to injure you during shaking.
The American Red Cross recommends keeping a survival kit with these essentials:
- Water: one gallon per person per day, with a three-day supply for evacuation and a two-week supply at home
- Food: non-perishable, easy-to-prepare items on the same timeline
- Medications: a seven-day supply plus any medical devices like glasses, hearing aids with extra batteries, or syringes
- Light and communication: flashlight, extra batteries, and a battery-powered or hand-crank radio (ideally one that receives NOAA Weather Radio)
- Documents: copies of insurance policies, identification, birth certificates, medication lists, and proof of address
- Basics: first aid kit, multi-purpose tool, sanitation and hygiene items, emergency blanket, local maps, extra cash, and a cell phone with chargers
Keep one kit at home and a smaller version in your car. After a major earthquake, utilities and supply chains can be disrupted for days or longer. The two-week water and food recommendation isn’t hypothetical. It reflects realistic recovery timelines after large urban earthquakes where infrastructure is heavily damaged.