Earthquake Preparedness: Lessons from 1906 & 2011

Earthquake preparedness is the one category of emergency planning where you get no second chances and no advance warning. As a FEMA-trained emergency management professional and Wilderness First Responder who’s spent over 12 years running preparedness drills and disaster response exercises across the Pacific Northwest, I can tell you this with certainty: every meaningful action you’ll take to survive an earthquake must be completed before the ground starts shaking. The 1906 San Francisco earthquake and the 2011 Japan Tōhoku earthquake — two of the most devastating seismic events in modern history — prove this point in starkly different ways. What they share is a single, critical lesson: preparedness infrastructure, not magnitude, determines who lives and who dies.

This guide breaks down what those disasters teach us, gives you a complete earthquake preparedness checklist, and walks you through exactly how to prepare your family for an earthquake — from the first 60 seconds through the first two weeks.

When It Happened Before

At 5:12 a.m. on April 18, 1906, the San Andreas Fault ruptured beneath San Francisco with a magnitude 7.9 earthquake that remains one of the defining disasters in American history. The shaking lasted roughly 42 to 60 seconds. What followed lasted three days — not aftershocks, but fire. Ruptured gas mains ignited blazes across the city, and broken water mains meant firefighters stood helpless watching entire neighborhoods burn. By the time the fires died, over 80% of the city was destroyed, approximately 3,000 people were dead, and 225,000 residents — more than half the city’s population — were homeless. People who survived the shaking died because the infrastructure meant to save them had been shattered in the same moment they needed it most.

Fast-forward to January 12, 2010, and a 7.0 magnitude earthquake struck near Port-au-Prince, Haiti. The magnitude was actually lower than San Francisco’s 1906 quake, but the death toll was catastrophically higher — estimated between 100,000 and 300,000 people killed. The difference wasn’t geology. It was infrastructure. Unreinforced concrete buildings pancaked. Hospitals collapsed. The national palace crumbled. Haiti exposed a truth that earthquake safety advocates have been screaming about for decades: the earthquake doesn’t kill you, the building does.

Just over a year later, Japan demonstrated the opposite end of the spectrum during the 2011 Tōhoku earthquake and tsunami. At magnitude 9.0 — releasing roughly 30 times more energy than the 1906 San Francisco earthquake, according to USGS seismologist Lucy Jones — Japan’s strict building codes meant most structures survived the shaking itself. What killed 15,897 people was the tsunami that followed, with some waves reaching 133 feet. The disaster triggered the Fukushima Daiichi nuclear crisis and caused an estimated $235 billion in damage, making it the costliest natural disaster in recorded history. Even with the most prepared nation on Earth, the scale overwhelmed the plan.

Then there’s the one that hits close to home for many Americans: the 1994 Northridge earthquake in Southern California. A 6.7 magnitude event — moderate by global standards — struck at 4:31 a.m. on a holiday, which is likely the only reason the death toll was 57 rather than hundreds. Sections of the Santa Monica Freeway and the Interstate 14/5 interchange collapsed entirely. Sixteen thousand buildings were damaged. The economic toll reached $40 billion. Timing was the only thing between a bad day and a catastrophe — and that’s not a preparedness strategy.

What the 1906 San Francisco and 2011 Japan Earthquakes Have in Common

The 1906 San Francisco earthquake (magnitude 7.9) and the 2011 Japan Tōhoku earthquake (magnitude 9.0) are two of the most studied seismic events in history. Separated by over a century, they occurred on different fault types, in different eras of engineering, and on opposite sides of the Pacific — yet they deliver the same core lesson about earthquake preparedness.

Both earthquakes prove that the primary shaking is rarely what kills the most people. In San Francisco, it was fire. In Japan, it was water. In both cases, secondary disasters caused the majority of fatalities — and in both cases, the level of preparedness infrastructure determined the scale of the catastrophe. Japan’s buildings largely held despite 30 times the energy release. San Francisco’s water system failed at the exact moment it was needed most. The shared lesson is unavoidable: preparedness infrastructure — not magnitude — determines survival outcomes.

Tectonic Plates and Fault Lines: Why These Earthquakes Happen

Understanding why earthquakes happen isn’t just academic — it tells you what kind of threat you’re actually facing and what secondary disasters to prepare for.

The 1906 San Francisco earthquake occurred along the San Andreas Fault, a transform boundary where the Pacific Plate and the North American Plate slide laterally past each other in what geologists call a strike-slip fault. This type of fault produces intense, localized shaking but doesn’t typically generate tsunamis because the ground moves horizontally rather than vertically displacing the ocean floor.

The 2011 Japan earthquake was fundamentally different. It occurred along the Japan Trench, a convergent boundary where the Pacific Plate subducts (dives beneath) the North American Plate. Subduction zone earthquakes can reach much larger magnitudes because the fault contact area is enormous. When the locked plates finally release, the sudden vertical displacement of the ocean floor is what generates devastating tsunamis.

Here’s where this gets personal for me. Living and working in the Pacific Northwest, I’m acutely aware that the Cascadia Subduction Zone — stretching from Northern California to British Columbia — shares the exact same tectonic mechanism that produced Japan’s 2011 disaster. The last Cascadia megathrust earthquake struck on January 26, 1700, at an estimated magnitude 9.0. It generated a tsunami that crossed the Pacific and was recorded in Japan. Geologic evidence suggests these events recur roughly every 200 to 500 years. We are 325 years into that cycle. When I run earthquake preparedness drills across the Pacific Northwest, this isn’t a theoretical exercise. It’s preparation for a specific, well-documented threat with a 100% probability of recurring — we just don’t know when. For those of us in the coastal PNW, tsunami preparedness and evacuation planning is not optional.

How Long Did the San Francisco Earthquake Last?

The 1906 San Francisco earthquake’s main shaking lasted approximately 42 to 60 seconds, with the most violent shaking concentrated in a 25- to 30-second window. That’s less than a minute to cause one of the worst disasters in American history.

Compare that to the 2011 Japan earthquake, which shook for approximately six minutes — one of the longest-duration earthquakes ever recorded by modern instruments. Six minutes of sustained shaking is almost incomprehensible if you’ve never experienced a major quake. Even moderate earthquakes that last 15 to 20 seconds feel like an eternity when you’re in them.

The critical takeaway: even short-duration earthquakes cause catastrophic damage, and you must be prepared to act within seconds. You don’t get to assess the magnitude while it’s happening. You don’t know if those first jolts are a 5.0 that’ll pass in 10 seconds or a 9.0 that’ll reshape your region. Your response — drop, cover, and hold on — must be automatic, every single time.

How Much Warning You’ll Actually Get

Zero. Let me say that again: you will get functionally zero warning before an earthquake. There is no earthquake season. There is no weather pattern that precedes it. The USGS does not issue earthquake forecasts the way the National Weather Service issues hurricane warnings five days out. The ShakeAlert system used along the West Coast can detect P-waves (the initial, less destructive compression waves) and send notifications seconds before the more damaging S-waves arrive — but we’re talking 10 to 60 seconds at best, and often less. Japan’s more mature early warning system managed to send alerts approximately 8 seconds before shaking reached Tokyo in 2011 — enough time for automated systems to slow bullet trains and open fire station doors, but not enough for most people to do more than brace.

This is what makes earthquake preparedness fundamentally different from almost every other disaster scenario. With hurricanes, you get days. With winter storms, you get hours. With wildfires, you usually get minutes to hours. With earthquakes, you get the time it takes to read this sentence. Every single meaningful action you take to survive an earthquake must be completed before the ground starts shaking. Your preparation is your warning.

And a note on prediction apps and earthquake prediction in general: despite decades of research, no scientist, algorithm, or app can reliably predict when an earthquake will occur. If you see an app or social media account claiming to predict earthquakes, it is not scientifically valid. The USGS is explicit on this. Don’t let a false sense of prediction replace actual preparedness.

How Building Codes Save Lives in Earthquakes

The contrast between the 2010 Haiti earthquake (magnitude 7.0, up to 300,000 dead) and the 2011 Japan earthquake (magnitude 9.0, 15,897 dead) is the single most powerful argument for seismic building codes in existence. Japan’s post-1981 Building Standards Law — significantly strengthened again in 2000 after the 1995 Kobe earthquake — required structures to withstand intense shaking through engineering techniques like base isolation (buildings resting on flexible pads that absorb seismic energy), moment-resisting frames (steel or concrete frames designed to flex rather than snap), and shear walls (reinforced walls that resist lateral forces). The result: in the 2011 Tōhoku earthquake, structural collapse from shaking was remarkably rare. The buildings held. The tsunami was the killer.

San Francisco in 1906 had no seismic building codes whatsoever. The city was built primarily of unreinforced masonry and wood frame construction on filled land that liquefied during shaking. Haiti in 2010 had building codes on paper but virtually no enforcement — concrete buildings were constructed with inadequate rebar and poor-quality materials.

What this means for you as a homeowner:

• Pre-1980 homes in seismic zones are the highest priority for retrofitting. Many older homes in California, Oregon, and Washington sit unbolted on their foundations — they can literally slide off during moderate shaking.
• Foundation bolting secures your home’s wood frame to its concrete foundation. Cost: typically $3,000–$7,000.
• Cripple wall bracing reinforces the short wood-framed walls between the foundation and the first floor. Cripple wall failure is one of the most common causes of homes collapsing off their foundations.
• Soft-story retrofits address buildings (often apartment complexes) with weak ground floors — typically open parking areas beneath living spaces. These are collapse-prone in even moderate quakes.
• California’s Earthquake Brace + Bolt program (earthquakebracebolt.com) offers grants up to $3,000 to help homeowners retrofit. If you’re in California and haven’t looked into this, do it today.

A seismic retrofit is one of the single highest-return preparedness investments you can make. The earthquake doesn’t kill you — the building does. Make sure yours can take a hit.

The First 72 Hours

The first 60 seconds determine whether you live or die. During shaking, the immediate threats are structural collapse, falling objects, shattered glass, and your own panicked decision-making. If you’re indoors, get under a sturdy table or desk, cover your head and neck, and hold on until the shaking stops — this is the drop, cover, and hold on method endorsed by every major emergency management agency. If there’s no table, move against an interior wall, crouch low, and protect your head. You do not run outside — falling debris from building facades kills people in the street. You do not stand in a doorway. If you’re in bed, stay in bed, pull the pillow over your head and neck, and ride it out. Then — and this is critical — reach under the bed for the shoes you’ve staged there, because the floor between you and the exit is now a carpet of broken glass.

The first hour after shaking stops is about immediate hazard assessment. Check yourself and household members for injuries. Smell for gas — if you detect it, shut off the main gas valve with the wrench you’ve kept strapped to the meter and get everyone outside. Do not flip light switches or use open flames if you suspect a gas leak. Check for structural damage: cracked foundations, leaning walls, chimney damage. If your home looks compromised, get out. If it’s intact, it’s your best shelter. Turn on a battery-powered radio for emergency information. Send a brief text to your out-of-area contact — texts often get through when voice calls can’t because they require less bandwidth. If you’ve established a family emergency communication plan in advance, this is when it pays off. Do not call 911 unless someone has a life-threatening emergency.

Hours 2 through 72 are about resource management and aftershock preparedness. Aftershocks are virtually guaranteed, and some will be powerful enough to bring down structures weakened by the initial quake. The 2011 Tōhoku earthquake produced a magnitude 7.7 aftershock within 30 minutes. Treat every aftershock like a new earthquake: drop, cover, hold on. During this window, water is your most critical supply. Earthquakes rupture water mains with remarkable consistency. The Northridge earthquake broke over 1,400 water main segments in Los Angeles. If you haven’t stored water in advance, you’re already behind. One gallon per person per day is the minimum — for a family of four, that’s 12 gallons just for the initial 72-hour window, and that’s a bare minimum that doesn’t account for heat, exertion, or medical needs. This is why serious earthquake preparedness always starts with how to store water for emergencies.

When Days Become Weeks

After the initial 72-hour window, the situation doesn’t improve — it just changes character. Municipal water may be offline for days to weeks depending on the severity and your location relative to damage. The 1906 San Francisco earthquake destroyed the city’s water supply system so thoroughly that it contributed directly to the uncontrollable fires. In a modern major earthquake, expect water service disruptions, boil-water notices (if service returns partially), closed roads, and gas station pumps that don’t work without electricity. Power restoration follows a triage pattern: hospitals and critical infrastructure first, then major corridors, then residential areas. After the Northridge earthquake, some areas waited over a week for power. Grocery stores — if they’re still standing and accessible — will be stripped within hours, not days. If you’re just starting your preparedness journey, our beginner’s guide to survival readiness covers the fundamentals of building a supply cache that gets you through exactly this kind of timeline.

The social dynamics shift around day four or five. Neighbors who were helping each other on day one start getting anxious about their own supplies. If roads are impassable — and after a major earthquake, they often are, due to bridge failures, overpasses down, and debris — outside aid may be slow to arrive. FEMA’s own guidance acknowledges that large-scale disasters can delay federal response for 72 hours or more, and that’s an optimistic estimate for a truly catastrophic event. Medical supplies become critical for anyone with chronic conditions: insulin, blood pressure medication, inhalers, psychiatric medications. Pharmacies may be damaged, closed, or out of stock. Sanitation becomes a genuine health hazard — with water mains broken, sewer systems often fail simultaneously, and improvised toilet solutions become a daily concern. This isn’t glamorous preparedness. It’s the unsexy reality of earthquake survival.

Long-Term: If It Doesn’t Resolve Quickly

History shows us that major earthquakes don’t “resolve” — they reshape communities for months to years. After the 2010 Haiti earthquake, a cholera outbreak introduced by international aid workers killed an additional 10,000 people over the following years. The Fukushima exclusion zone displaced 154,000 people, many permanently. The Northridge earthquake led to a fundamental rewrite of California’s earthquake building codes and seismic retrofit requirements, but that process took years, and the people living in damaged homes didn’t get to pause their lives while policy caught up. Insurance claims after Northridge took months to process, and many homeowners discovered their policies didn’t cover earthquake damage — a separate and often expensive rider that most people skip.

In a prolonged scenario, your daily life changes in ways that go beyond the physical damage. You may be living in a tent in your backyard because your home is standing but red-tagged by inspectors. You may be commuting three hours because the direct route no longer exists. Schools may be closed for weeks. Your job may not exist anymore if your workplace was destroyed.

Here are the long-term preparedness actions most people miss:

• Maintain a two-week supply of prescription medications at all times. Talk to your doctor and insurance company about getting an extra supply authorized for emergency storage.
• Keep physical cash on hand — $200 to $500 in small bills (fives, tens, twenties). ATMs, card readers, and digital payment systems all require electricity and network connectivity, both of which will be down.
• Document your home contents with a video walkthrough before disaster strikes. Open every drawer, closet, and cabinet. Upload the video to cloud storage. This single step can save you tens of thousands of dollars in insurance disputes.
• Establish a family reunification plan that accounts for bridge and highway closures. In my experience running drills in Portland and Seattle, most families’ reunion plans assume road infrastructure that won’t exist after a major quake. Plan walking routes. Identify multiple rally points.
• Invest in a secondary water filtration method — a gravity-fed filter like a Berkey or a supply of purification tablets — for sustained use beyond your initial stored water supply. When I’ve tested these in field scenarios, a good gravity filter turns questionable water sources into a reliable long-term solution.
• Build relationships with your neighbors now. Community resilience after an earthquake is the single most underrated preparedness factor. The neighborhoods that recover fastest are the ones where people already know each other.

Knowing basic self-reliance skills becomes genuinely valuable in extended disruptions, and resources like The Beginner’s Guide to Survivalism can help you build that foundation before you need it.

Your Earthquake Preparedness Checklist

Before — Preparation (Do This Now)

• Secure heavy furniture to wall studs — bookshelves, dressers, and entertainment centers become projectiles in a quake. Use L-brackets and toggle bolts, not adhesive strips.
• Strap your water heater to the wall — a 40-gallon water heater weighs over 300 pounds when full. It will topple, rupture gas and water lines, and potentially start a fire. Most hardware stores sell strapping kits for under $20.
• Locate your home’s gas shutoff valve and strap a 12-inch crescent wrench or dedicated gas shutoff wrench to the meter. Practice turning it.
• Store shoes and a flashlight under every bed in the house. Broken glass barefoot in the dark is one of the most common and preventable earthquake injuries.
• Identify safe spots in every room: under sturdy tables or desks, against interior walls away from windows, mirrors, and heavy hanging objects. Make sure every family member knows these spots by heart.
• Store a minimum of two weeks of water per person — one gallon per person per day for drinking and basic sanitation. Water bricks, stackable containers, or a WaterBOB bathtub bladder are all solid options. For a family of four, that’s 56 gallons. Yes, it takes space. Yes, it’s worth it.
• Build a 72-hour food supply of non-perishable, no-cook items: canned goods (with a manual can opener), energy bars, peanut butter, dried fruit, crackers. Our guide on how to build a 72-hour emergency kit walks you through this step by step.
• Keep a crowbar or pry bar accessible — not buried in the garage. If a door frame shifts and jams, you need mechanical advantage to get out.
• Establish a family meeting point outside your immediate neighborhood. Bridges, overpasses, and major intersections may be impassable. Pick a location everyone can reach on foot from multiple directions.
• Prepare a waterproof document bag containing copies of insurance policies, your home deed or lease, passports, birth certificates, medical records, and a USB drive with digital backups.
• Get earthquake insurance if you’re in a seismic zone. Standard homeowner’s insurance does not cover earthquake damage.
• Bolt your home to its foundation if you have an older home with a raised foundation. Look into California’s Earthquake Brace + Bolt program or equivalent programs in your state.
• Conduct a seismic vulnerability assessment — hire a structural engineer or at minimum walk through the checklist on FEMA’s earthquake preparedness resources page.

During — Immediate Response

• Drop, Cover, and Hold On. Get under sturdy furniture, protect your head and neck, and hold onto the furniture leg so it doesn’t shake away from you.
• If in bed, stay in bed. Pull a pillow over your head and neck.
• If outdoors, move to an open area away from buildings, power lines, and trees. Drop to the ground.
• If driving, pull over away from overpasses, bridges, and buildings. Stay in the vehicle until shaking stops.
• Do not run outside during shaking — falling glass and facade debris are more dangerous than most interior spaces.
• Do not use elevators after an earthquake, even if they appear functional.

After — Recovery

• Put on shoes immediately. Glass everywhere.
• Check for gas leaks (smell, hissing sound). Shut off gas if suspected. Do not use open flames or electrical switches.
• Check for structural damage before moving through your home. Look for cracks in the foundation, shifted walls, and chimney damage.
• Send a text to your out-of-area emergency contact. Keep messages brief. Avoid voice calls.
• Turn on a battery-powered or hand-crank radio for emergency broadcasts.
• Photograph all damage for insurance claims before moving or cleaning anything.
• Prepare for aftershocks. They will come. Treat each one as a new event: drop, cover, hold on.
• If near the coast and you felt strong shaking lasting 20+ seconds, move to high ground immediately without waiting for an official tsunami warning. The 2011 Japan tsunami arrived in some coastal areas within 30 minutes of the earthquake.
• Do not re-enter red-tagged buildings for any reason.

What Most People Get Wrong

The single most persistent myth in earthquake preparedness is the doorway. People still believe they should stand in a doorframe during an earthquake. This advice dates back to observations of adobe structures in early California, where the doorframe was often the only part left standing. In a modern wood-frame or steel-frame building, the doorframe is no stronger than any other part of the structure, and you’re exposed to a swinging door that can break fingers or knock you off your feet. Drop, cover, and hold on — under a table, away from windows. That’s it. The science is settled.

The second major mistake is underestimating the water problem. People stock food but neglect water, or they store a case of water bottles and call it done. A case of 24 half-liter bottles is about 3 gallons — that’s not even one day’s supply for a family of four. After a significant earthquake, municipal water may be contaminated or simply gone for a week or more. You need real earthquake water storage: multiple 5-gallon jugs, a WaterBOB, or larger capacity containers, plus a quality water filter for supplementing from secondary sources.

The third common error is assuming help will arrive quickly. After large-scale disasters, fire and rescue services are immediately overwhelmed, roads may be impassable, and organized response is triaged to the most critical areas first. Your neighborhood may not see official help for days. Having solid camping and outdoor gear — the kind we cover in best camping gear for emergency preparedness — can turn an uncomfortable situation into a manageable one.

The fourth myth I still encounter constantly is the “triangle of life” — the idea that you should lie in a fetal position next to a large object rather than getting under it. This theory has been debunked by FEMA, the American Red Cross, and every major emergency management agency worldwide. In real earthquake collapses, objects shift unpredictably, and the “triangle” space is unreliable. Drop, cover, and hold on remains the evidence-based standard.

Fifth, people assume California is the only earthquake risk in the United States. That’s dangerously wrong. The New Madrid Seismic Zone in the central U.S. produced a series of magnitude 7.0+ earthquakes in 1811–1812 that rang church bells in Boston. The Wasatch Fault in Utah threatens Salt Lake City. And as I’ve mentioned, the Cascadia Subduction Zone puts the entire Pacific Northwest at risk for a magnitude 9.0+ event. Earthquake preparedness isn’t a California problem — it’s a national one.

And finally, people dramatically underestimate aftershocks. The 1994 Northridge earthquake was followed by thousands of aftershocks, including several above magnitude 5.0. Aftershock sequences can last weeks to months. Buildings weakened by the initial quake can collapse in an aftershock that would normally cause no damage on its own. Just because the main event is over doesn’t mean the danger has passed — treat every aftershock as a new earthquake, reassess structural damage after each significant one, and stay out of compromised buildings no matter how badly you want to retrieve something inside.

Frequently Asked Questions

How long did the San Francisco earthquake last?

The 1906 San Francisco earthquake’s main shaking lasted approximately 42 to 60 seconds, with the most violent, destructive shaking concentrated in a 25- to 30-second window. By contrast, the 2011 Japan Tōhoku earthquake shook for approximately six minutes — one of the longest-duration earthquakes ever recorded. Even the shorter San Francisco event caused catastrophic damage, which underscores why your earthquake response must be automatic and practiced in advance.

What earthquake killed 830,000 people?

The 1556 Shaanxi earthquake in China is the deadliest earthquake in recorded history, killing an estimated 830,000 people. The massive death toll was primarily due to the collapse of “yaodongs” — cave dwellings carved into loess cliffs that were common in the region. The loess soil liquefied during shaking, causing the cliff dwellings to collapse and bury their inhabitants. Like every major earthquake disaster, the primary killer wasn’t the shaking itself — it was the failure of the structures people lived in. This 460-year-old tragedy reinforces the same lesson we see in the 1906 and 2011 earthquakes: building design and material quality are the single greatest determinants of earthquake survival.

Build Your Earthquake Preparedness Plan Today

If you’ve read this far, you know more about earthquake preparedness than the vast majority of people living in seismic zones. But knowledge without action is just anxiety fuel. The gap between “I should prepare” and “I am prepared” is measured in a few weekends of work, a few hundred dollars in supplies, and the discipline to actually follow through.

Start with the three highest-impact actions: bolt your home to its foundation if it isn’t already, store two weeks of water for your household, and establish a family communication and reunification plan that doesn’t depend on working infrastructure. Those three steps alone put you ahead of 90% of the population. Then work through the checklist above, one section at a time. In my 12 years of field experience, I’ve never once met someone who regretted being over-prepared. I’ve met plenty who regretted the opposite.

The 1906 San Francisco earthquake and the 2011 Japan earthquake are separated by a century of engineering progress, and that progress saved countless lives. But building codes protect the building. You have to protect yourself and your family. The ground will shake again — in California, in the Pacific Northwest, in the central U.S., in places that haven’t felt a major quake in generations. The only question is whether you’ll be ready when it does.

Don’t wait for a warning that will never come. Prepare now.

This guide is reviewed and updated annually based on the latest USGS and FEMA guidance. Last updated: April 2026.

Sources and Further Reading

• United States Geological Survey (USGS) — Earthquake Hazards Program: earthquake.usgs.gov
• FEMA — Earthquake Preparedness: ready.gov/earthquakes
• NOAA Center for Tsunami Research: nctr.pmel.noaa.gov
• California Earthquake Authority — Earthquake Brace + Bolt Program: earthquakebracebolt.com
• USGS ShakeAlert Earthquake Early Warning System: shakealert.org
• Pacific Northwest Seismic Network (PNSN): pnsn.org
• Building Seismic Safety Council — FEMA P-154 Rapid Visual Screening: fema.gov