What to Do in the First 10 Seconds of an Earthquake

The ground starts shaking. Your heart rate spikes. You have roughly 10 seconds to make decisions that could determine whether you walk away uninjured or end up in an emergency room.

Those first seconds matter more than most people realize. Research from earthquake engineering labs and real-world casualty data consistently shows that what you do in the first 5–10 seconds of an earthquake is the single biggest factor in whether you get hurt.

This isn't about panic. It's about training. Like a fire drill, earthquake response becomes automatic when you've practiced it. Here's exactly what science says you should do — and what you absolutely should not.

The Science Behind Those Critical Seconds

When an earthquake begins, two types of seismic waves arrive at your location in sequence:

P-waves (Primary) — arrive first, travel at 6–8 km/s. They produce a jolt or rumble, like a truck hitting your building. Damage is usually minimal.
S-waves (Secondary) — arrive second, travel at 3.5–4.5 km/s. These produce the violent side-to-side shaking that causes most damage and injuries.

The gap between P-wave arrival and S-wave arrival is your warning window. Depending on your distance from the epicenter, this gap ranges from 2 to 90 seconds. Earthquake early warning systems like GeoShake detect P-waves and send alerts to your phone before the destructive S-waves arrive.

But even without an app, the moment you feel shaking, your internal clock starts. Here's how to use every second.

Second 1–3: Drop

The instant you feel shaking or hear a rumble, get low.

Why: The most common earthquake injury is being knocked to the ground by violent shaking and then being hit by falling objects. If you're already on the ground, you can't fall. Your center of gravity is low, and you're mobile.

How: Drop to your hands and knees. This position:

Prevents you from being thrown down
Protects vital organs
Allows you to crawl to cover

Common mistake: Trying to run. Data from the 1994 Northridge earthquake in Los Angeles showed that people who tried to move more than a few steps during shaking were significantly more likely to be injured by falls or flying objects.

Second 3–7: Cover

Once you're on the ground, get under something sturdy and protect your head and neck.

Best Options (In Order)

Under a sturdy desk or table — the ideal position. Tables absorb falling debris and create a survival space.
Against an interior wall — if no table is available, kneel beside an interior wall (not exterior), cover your head and neck with your arms.
Next to large, heavy furniture — a sofa or bed can deflect falling debris, though a table is better.

What NOT to Seek Cover Under

❌ Glass tables — they'll shatter
❌ Under heavy furniture that might collapse on you (like a piano)
❌ Near windows, mirrors, or glass partitions
❌ Near heavy objects on shelves that could fall

Head and Neck Protection

If you can't get under furniture, the absolute minimum is: one arm over the back of your neck, ducking your head down. The cervical spine and skull are the most vulnerable areas. Studies of earthquake fatalities consistently show that head injuries from falling objects are the leading cause of death in moderate-to-strong earthquakes.

Second 7–10: Hold On

If you're under a desk or table, grab a leg of the furniture and hold tight.

Why: Strong earthquakes can violently shift furniture. If your table moves and you don't move with it, you lose your protection. Holding on keeps you sheltered as the shaking continues.

If you're against a wall: Keep your arms over your head and neck. Stay as small as possible.

The shaking may last 10–60 seconds for a strong earthquake. The 2011 Tōhoku earthquake in Japan lasted approximately 6 minutes. Even in shorter events, the most intense shaking can persist for 15–30 seconds.

Stay in position until the shaking completely stops. Aftershocks can begin within seconds of the main event.

After the First 10 Seconds

Once you've executed Drop, Cover, and Hold On, your next actions depend on the severity:

Light Shaking (Magnitude < 5.0)

Stay in position until shaking stops
Check for any fallen objects
Move carefully — there may be broken glass on the floor
Check in with family members

Strong Shaking (Magnitude 5.0+)

Stay in cover until shaking fully stops
Put on shoes — broken glass is everywhere
Check for fires, gas leaks, and water damage
Don't use elevators — take stairs if you need to evacuate
Move away from the building exterior — aftershocks can dislodge weakened facades
Check on neighbors — especially elderly or disabled residents

Location-Specific Guidance

In Bed

Stay in bed
Cover your head with a pillow
Flying glass from broken windows injures more people who get out of bed than those who stay

In a High-Rise Building

Drop, Cover, and Hold On
Do NOT rush for exits or stairways — they may be damaged or blocked
Move away from exterior walls and windows
Expect fire sprinklers and alarms to activate
After shaking stops, evacuate via stairways (avoid elevators)

In a Car

Pull over safely, away from overpasses, bridges, and power lines
Set the parking brake
Stay inside the vehicle — it acts as a shield
After shaking, proceed slowly, watching for road damage

Outdoors

Move to an open area away from buildings, trees, and overhead structures
Drop to the ground if shaking is severe
Watch for falling power lines

In a Stadium or Theater

Stay in your seat
Protect your head with your arms or any available cover
Do NOT rush for exits — crowd crushes cause more injuries than earthquakes in these settings

In a Store

Move away from shelves with heavy objects
Drop and take cover
Shopping carts can provide temporary protection

Debunking Dangerous Myths

❌ "The Triangle of Life"

This theory — which claims you should curl up next to large objects rather than under them — has been thoroughly debunked by every major earthquake engineering organization. It was based on observations from pancake-collapse buildings, which are rare in countries with modern building codes.

The American Red Cross, FEMA, the Earthquake Country Alliance, and Turkey's AFAD all recommend Drop, Cover, and Hold On.

❌ "Run to a Doorway"

This advice dates back to early California earthquakes when adobe buildings collapsed but doorframes remained standing. In modern construction, doorways are no stronger than any other part of the structure. You're better off under a table.

❌ "Get Outside Immediately"

Running during an earthquake is dangerous. You're more likely to be injured by:

Falling debris from the building exterior (bricks, glass, signs)
Tripping on shifted surfaces
Being hit by objects knocked off shelves as you pass

The exit path is almost always more dangerous than a secured indoor position.

Training Your Response

The difference between knowing what to do and actually doing it is practice. Your brain's fight-or-flight response during an earthquake floods your body with adrenaline — and without prior training, most people freeze or make poor decisions.

How to Practice

Monthly micro-drills — set a random alarm. When it rings, Drop, Cover, Hold On wherever you are. Time yourself. You should be in position within 3 seconds.
Family drills twice per year — practice at different times (morning, night, weekend) and in different rooms.
Mental rehearsal — spend 60 seconds visualizing your response in each room. Where's the nearest table? Where are the hazards?
Workplace drills — encourage your employer to conduct regular earthquake drills, especially in seismic zones.

Teaching Children

Keep it simple and non-frightening:

"When the ground shakes, be a turtle" (drop and cover your head)
Practice the "earthquake game" regularly
Point out safe spots in each room
Make sure children know the family meeting point

How Technology Extends Your Warning Window

Those 10 seconds become even more valuable when you get a few extra seconds of advance notice through earthquake early warning technology.

Community sensor networks like GeoShake place dedicated hardware sensors in homes and buildings. When a nearby sensor detects P-waves, the network can alert your phone before the S-waves reach your location. This can add 5–30 seconds to your response time.

With a 15-second head start, you can:

Drop, Cover, and Hold On before shaking even begins
Open doors (they may jam during shaking)
Move away from hazardous positions (under a chandelier, next to a window)
Alert family members in other rooms

Every second counts. Join the GeoShake community sensor network. Get alerts before the ground shakes. Download free on iOS and Android.

Key Takeaways

Drop, Cover, Hold On — this is the scientifically validated response. Period.
Don't run — most injuries happen when people try to move during shaking.
Protect your head — it's the most vulnerable and most important thing to shield.
Practice — automated response saves lives. Drill regularly.
Use technology — earthquake alert apps give you extra seconds. Use them.

The first 10 seconds of an earthquake are yours to command. Train for them.

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What to Do in the First 10 Seconds of an Earthquake (Science-Based)