What to Do When There Is an Earthquake | Mexico Safety, SASMEX and 911 Emergency Guide

If an earthquake starts shaking the building you are in in Mexico, protect your head and neck, keep away from windows and objects that can fall, and use the nearest identified lower-risk area. Do not run into a crowded staircase or jump from a window while the structure is moving. If you hear an official SASMEX earthquake alert before shaking, use the available seconds to take the protective action appropriate to your building and its practiced emergency plan.

After the shaking stops, check for injuries, gas smells, broken glass, unstable walls, damaged stairs and fallen cables. Leave a damaged building by an authorised safe exit when directed, remain away from weakened façades and follow Protección Civil instructions. For someone seriously injured, trapped, or in immediate danger, call 911. If you are near Mexico’s Pacific coast and experience strong or long shaking, be ready to move away from the shoreline to designated high ground as soon as you can move safely.

This guide is designed for families, students, workers and visitors in Mexico City, Estado de México, Puebla, Oaxaca, Guerrero, Michoacán, Chiapas, Colima, Jalisco, Veracruz and other seismic regions. It explains what to do before, during and after a quake, how earthquake alerts work, which messages to trust, and how safety decisions change in apartments, schools, transit, roads and coastal areas. For current information use the Centro Nacional de Prevención de Desastres (CENAPRED), your state or municipal Protección Civil, and the Servicio Sismológico Nacional (SSN). This is not a live earthquake prediction or building inspection.

Quick answer: the first actions

During shaking indoors: remain as calm as possible; protect your head and neck, move away from glass and falling objects, and use your identified safe area.
If SASMEX warns before shaking: follow the building’s practiced procedure; do not rush down stairs if you cannot reach a safe exit before movement begins.
Avoid lifts and unsafe stairways during and immediately after a significant earthquake, particularly in a damaged building.
Outside: keep clear of façades, overhead cables, walls, balconies and objects that may fall, as far as movement can be done safely.
Driving: slow progressively and pull over in a suitable safe place away from bridges, buildings, trees and wires where practicable.
After the quake: check for injuries, damaged structures, gas leaks and electrical hazards; follow local evacuation or re-entry directions.
Do not light matches or operate switches if gas is suspected. Leave the area and report the hazard from safety.
If near the coast after powerful shaking: follow tsunami evacuation signs toward high ground and stay away from river mouths and low beaches.
Call 911 for immediate life-safety emergencies, and send short messages for routine family status to avoid unnecessary call congestion.
Expect aftershocks: do not re-enter a cracked or otherwise damaged building until the responsible authority or a qualified professional clears it.

Mexico’s CENAPRED instructions on what to do in a quake establish the preparation–action–review sequence and the importance of lower-risk areas, controlled movement and official information.

Understand what Mexico’s earthquake alert does

The Sistema de Alerta Sísmica Mexicano (SASMEX) is an early-warning system that detects a quake that has already begun, rather than forecasting a future earthquake. Its sensors and communications may send a warning to covered areas before the strongest seismic waves arrive.

The available lead time depends on where the quake begins, the distance to the alerted area, detection, communications and other factors. A distant source may allow more protective time; a nearby earthquake may produce shaking at the same time as the alert or before it. Coverage is not identical nationwide.

CENAPRED’s October 2026 explanation of the science of the alert stresses that SASMEX does not predict earthquakes. It uses the difference between communication speed and the travel of seismic waves.

Therefore, do not wait for an alert when shaking has already begun. Protect yourself immediately. Conversely, when an authentic alert arrives and shaking has not yet begun, take it seriously rather than waiting to feel the quake.

Why the alert sometimes sounds without strong local shaking

An alert may be broadcast for a strong detected earthquake, but the shaking felt at your address can be less severe than expected because of distance, depth, soil, building response and the path of seismic waves. That does not automatically mean the system malfunctioned.

The purpose of warning is to offer an opportunity for protective action when a potentially dangerous earthquake has begun. False reassurance would be far more dangerous than treating a genuine warning seriously.

Do not assume every alert gives a fixed number of seconds. An online claim that the siren always provides a 60-second countdown is misleading. The amount of warning can vary sharply and may be zero in a local event.

For a household, the operational plan is simple: hear the alert, use the nearby lower-risk area or exit if the established plan and time clearly permit, then protect during shaking.

CENAPRED, SSN, Protección Civil and SASMEX are not the same agency

CENAPRED is Mexico’s national disaster prevention centre, providing research and preparedness guidance. The Servicio Sismológico Nacional at UNAM publishes earthquake observations including magnitude and location. SASMEX, operated by CIRES, provides earthquake early-warning signals to the relevant covered systems.

State and municipal Protección Civil authorities are responsible for important aspects of local emergency instructions, risk management, access and shelter. Police, fire and medical services respond to immediate life-safety emergencies.

A recorded earthquake magnitude from SSN is not a building-safety certificate. A SASMEX alert is not a forecast of damage at every address. A municipal closure is not automatically a countrywide order.

Readers need all these layers, but should use each one for the decision it actually supports.

The safest place inside the building depends on the building

Mexico’s CENAPRED advises identifying zonas de menor riesgo—lower-risk or safer areas—before an earthquake. Their position depends on construction, windows, furniture, layout and the building’s emergency plan.

A suitable interior location may reduce exposure to glass and falling objects. In other buildings, a sturdy table may provide head protection. No single corner or doorway is guaranteed safe in every structure. A qualified building assessment and an established local procedure are more valuable than a viral diagram claiming all bathrooms or columns are safe.

Do not stand beneath heavy shelving or hanging equipment merely because the spot is close to the corridor. Secure furniture and plan refuge areas in advance, particularly in children’s bedrooms and classrooms.

If strong shaking begins without warning, prioritise immediate head and neck protection over crossing a room to reach an idealised spot.

During the shaking: what to do in an apartment

If you are inside an apartment, stay away from large glass panels, mirrors, unsecured bookcases, televisions and kitchen items that can fall. Protect your head and neck in a nearby suitable lower-risk area.

Do not attempt to reach the lift or run down many flights of stairs while the building sways. Stairs can become crowded, handrails may shift and falling material can injure people trying to leave prematurely.

When shaking has ended, inspect your immediate route for broken glass, exposed wiring, falling façade materials and structural damage. Follow the building’s emergency procedure and local Protección Civil instructions for evacuation.

A building’s appearance from the street does not reliably establish the safety of its structure or internal stairs. Avoid returning to a damaged apartment until it has been assessed by the responsible authorities or qualified professionals.

High-rise buildings and earthquake movement

Upper floors may experience noticeable movement even when the earthquake’s magnitude is not exceptionally large. A swaying sensation does not by itself indicate that the building is collapsing, but residents should use the correct protective procedure.

Secure tall furniture and heavy objects before any quake. Understand where to move during shaking and which stairways are designated for use afterward. Do not assume the balcony or rooftop is safe because it offers open air.

After a strong earthquake, building managers should account for occupants and communicate inspection and access decisions. A lift may not be suitable for evacuation until its condition is verified.

A family should know the safest route from apartment to assembly location after shaking, not confuse that route with a command to run during movement.

When you are outside

Buildings can shed glass, masonry, signs, roof tiles and fragments during shaking. Avoid standing close to façades, high walls, poles, large trees or overhead cables. Move to a safer open location if the route itself is safe.

Do not rush into a narrow street between damaged buildings simply because it leads to the nearest public square. Local risk also includes loose slopes, unsupported walls and utility damage.

If you are already in an open area away from falling hazards, protect your head and remain clear of dangerous structures. Follow the emergency personnel controlling nearby roads.

The goal is not merely being outside; it is being away from falling material and unstable ground.

In a vehicle or on the road

If an earthquake begins while driving, slow carefully and stop in an appropriate safe place when possible. Avoid bridges, tunnels, underpasses, large buildings, overhead signs, trees and utility lines if a safer stopping location is available.

Do not brake abruptly in heavy traffic or make a sudden unsafe turn. After the quake, check for fallen material, cracks or barriers and comply with road closures.

A navigation app cannot assess whether a bridge foundation has shifted or a slope has failed. A road being geographically shortest is not proof it is structurally safe after an earthquake.

Leave access available for police, ambulances and rescue teams. Do not begin unnecessary sightseeing drives to view damage.

Mexico City Metro and public transport

On a train or bus, protect yourself from falling or moving objects, hold on where appropriate and follow trained staff instructions. Do not force open carriage doors or enter tracks when a train stops for an earthquake.

Public transport may be halted for inspections of tracks, power systems, tunnels, bridges or stations. A stopped service does not mean passengers should self-evacuate into an electrically hazardous rail corridor.

When staff direct an orderly evacuation, follow the assigned exit. Avoid crowding stairways and escalators after strong shaking.

The correct public-transit action is protect first, then follow the operator’s safety and evacuation procedure.

Schools and children: one instruction at a time

A school should designate lower-risk areas in classrooms, safe evacuation routes, staff roles and assembly points. Students need a clear routine: “Protect your head, avoid windows, wait for the shaking to stop and follow your teacher.”

Children should not be told to run toward the school gate while desks and glass are moving. Once shaking ends, staff should check exits, account for pupils and follow the school’s emergency plan.

Parents should understand where students will be taken and how reunification will occur. Driving into blocked streets to collect a child may prevent emergency vehicles and organised transport from moving.

School staff also need plans for students with mobility, sensory or medical needs. A drill is successful only if everyone can actually complete it safely.

Workplaces, factories and markets

Industrial areas may contain overhead loads, machinery, chemicals, glass shelving and electrical equipment. Workers should use the established site-specific protective procedure rather than improvising during movement.

After the quake, supervisors should check for injured people, gas or fuel leaks, unstable racks, damaged electrical systems and blocked exits. Do not restart machinery without relevant safety checks.

Market vendors should not remain beneath visibly damaged awnings or walls to protect merchandise. A warehouse may be unsafe even if goods are still neatly stacked.

A business continuity plan begins with worker accountability and safe access, followed by equipment inspection and only then reopening.

If you are sleeping when an earthquake begins

An earthquake can wake you suddenly at night. Do not run barefoot across broken glass. If there is no immediate collapse hazard above the bed, protect your head with pillows or bedding until the movement stops, then put on shoes and use a flashlight.

Keep heavy objects away from the bed and identify an emergency path during normal conditions. Store accessible footwear, light and medication nearby.

After the quake, avoid gas flames, damaged wiring and dark stairways until they can be assessed. Follow any building or local evacuation instructions.

A nighttime household drill can reveal practical barriers that a daytime rehearsal misses, such as an older person unable to find glasses or children unfamiliar with the route.

If gas is suspected: do not create sparks

Earthquakes can damage gas installations or connections. A gas smell or hissing sound may require immediate protective action. Avoid matches, candles, lighters, smoking and electrical switches in an area where a leak may be present.

Leave the danger area as safely as possible and report the leak to the appropriate emergency or utility service from a safer location. Shut off a valve only when it can be done safely and according to utility guidance; do not remain in a potentially explosive atmosphere to search for the source.

CENAPRED repeatedly warns against lighting matches or candles before verifying gas safety after a quake. Its post-earthquake checklist reinforces this point.

Electrical power returning unexpectedly can also be hazardous around damaged systems. Seek professional inspection when needed.

Aftershocks: why the danger continues

An aftershock is another earthquake in the sequence following a larger event. Aftershocks can damage buildings already weakened by the initial shaking. A quiet hour or two does not establish that the sequence is finished.

Keep away from damaged façades, unstable walls, cracked stairways and other structures until safe access has been confirmed. If a new quake begins while you are inside a suitable building, return to your protective action.

Do not share claims that the exact next aftershock will happen at a particular clock time. Seismologists can assess statistical behaviour and ongoing observations, but there is no reliable public method for predicting a specific quake’s exact date and magnitude.

A family should prepare for possible additional shaking without treating every rumour as a new official warning.

Coastal earthquakes and tsunami hazards

Mexico’s Pacific coastline can be affected by strong earthquakes and potential tsunami hazards. A tsunami is not triggered by every quake, but a strong or prolonged coastal earthquake is reason to check whether immediate self-evacuation is needed.

If you are in an exposed low coastal area and experience strong shaking or receive an official tsunami warning, move to designated higher ground or inland safety after the shaking stops. Do not wait for the sea to recede visibly or a wave to appear.

Avoid beaches, river mouths, estuaries and harbours, which can experience powerful currents. Remain at the safe location until authorities permit return. A tsunami may involve several waves.

CENAPRED’s earthquake guidance specifically advises coastal communities to leave low shore areas and seek higher ground.

Earthquake magnitude versus what a building experiences

Magnitude is a measure of the overall size of an earthquake, not the shaking force in every apartment. Local effects depend on distance to the source, depth, soil conditions, building design and other factors.

A large earthquake far away may produce less shaking at one site than a smaller nearby event. Some parts of Mexico City experience important amplification due to local ground conditions.

A news report announcing a magnitude does not mean your building has been assessed as safe. Conversely, hearing that the quake was ‘only moderate’ is not permission to ignore visible structural damage.

Follow local conditions and official inspections rather than using one number as a safety certificate.

What to do if a wall or staircase is cracked

If visible damage suggests potential instability, avoid entering or remaining in the affected area and seek official or qualified structural assessment. New significant cracks, shifted columns, damaged beams, leaning walls or debris around supports are warning signs that require caution.

Do not attempt to repair structural cracks using paint or plaster merely to make them less visible. Cosmetic appearance does not restore load-bearing capacity.

If someone needs to retrieve medication or equipment from a damaged building, seek appropriate safety guidance or help rather than entering alone during aftershocks.

Re-entry requires more than the front door still opening.

Trapped people and search-and-rescue priorities

If someone may be trapped in collapsed debris, call 911 and provide precise location, last known position, number of people and any signs of breathing or movement. Rescue teams must assess unstable structures and use appropriate equipment.

Untrained neighbours should not dig deeply into precarious rubble or pull large structural elements without guidance. Moving one heavy object can cause additional collapse.

From a safe position, provide rescuers with building layout, occupancy information and the last-seen location. Keep access roads clear for emergency vehicles.

If you are trapped and can communicate, send your precise location, condition and number of people, while conserving battery. Use a whistle or tapping when safe to signal searchers.

Families: the first six hours after a quake

During the first hours, information may be incomplete, electricity may be off and roads may be restricted. Prioritise injuries, a safe location, drinking water, necessary medicines and short family messages.

Avoid repeated nonurgent telephone calls. Use text messages or internet-based communication when available and inform a trusted out-of-area contact that you are safe.

Do not travel to every relative’s address if doing so requires entering a damaged district. Coordinate by phone and follow local emergency instructions.

An assembly location should be outside immediate falling-material hazards. If the planned area is blocked or unsafe, use the designated alternative or official instructions.

Emergency contacts in Mexico

911 is Mexico’s general emergency contact for urgent police, fire, medical and rescue assistance. In a life-threatening situation, call and state your location, what has happened and whether anybody is injured or trapped.

The responsible state or municipal Protección Civil service may publish additional local contact numbers and evacuation information. Find those details before an emergency instead of relying on an old screenshot or generic list.

For earthquake observations, consult the SSN. That scientific service is not the same as an urgent rescue dispatcher.

Do not overwhelm emergency lines to ask whether a distant quake has an updated magnitude; use official observation sources for nonurgent information.

Build a practical family earthquake plan

A useful plan identifies safer spaces, exits to use after shaking, family responsibilities, meeting points and medical or accessibility needs. Rehearse it with realistic constraints rather than simply reading it aloud.

Identify zonas de menor riesgo in the rooms people use.
Secure tall furniture and heavy objects that could fall.
Identify the safe exit and assembly point for home, school and workplace.
Agree who helps children, older adults and people with disabilities.
Keep shoes, torch, medicine and important contact information accessible.
Know how to report suspected gas or electrical damage.
Identify a second meeting point if the first route is blocked.
Practise the procedure for an authentic SASMEX alert and for shaking with no alert.
Learn whether your coastal location needs a tsunami evacuation plan.
Choose an out-of-area family contact for short status updates.
Keep a small carryable emergency bag ready.
Understand that a drill is preparation, not a way to forecast an earthquake.

CENAPRED promotes family planning, drills, safer areas, household utility checks and emergency supplies as part of a coherent approach.

What belongs in a small emergency bag?

Essential prescriptions, medicine, glasses and important medical information.
Drinking water and suitable ready-to-eat food.
Identification and key papers in protective wrapping.
Phone, charger, power bank, flashlight and spare batteries.
Suitable shoes, clothes and basic hygiene items.
Infant feeding supplies or accessibility equipment where necessary.
A written meeting place and out-of-area contact.
A whistle, small first-aid supplies and any useful household-specific item.
Small cash and keys, if readily available.
Pet carrier or lead where appropriate and safe.

The bag must not cause delay during shaking. Protect first; collect it afterward only when safe and the evacuation plan permits.

Children, older adults and disability access

A child may need a one-sentence instruction: “Protect your head now; when it stops, stay with our adult and follow the safe route.” Keep language simple and avoid inventing frightening disaster scenes.

An older adult or wheelchair user may not be able to reach stairs or a shelter without help. Plan an accessible evacuation route and assistance before a quake.

For people with medical equipment that depends on power, speak with the healthcare provider about backup and transport arrangements. Do not assume that a public shelter automatically provides every required medical service.

When calling emergency services, identify which person cannot move and what equipment or help is needed. That detail matters for rescue planning.

Visitors in Mexico City and coastal tourist areas

Visitors should learn their hotel or rental’s safety plan, assembly point and local emergency contact. A hotel is not necessarily safer or more dangerous than a nearby building based on height alone; building-specific guidance matters.

If an authentic earthquake alert sounds, follow the building staff’s trained response rather than running through a crowded lobby. When shaking begins, protect yourself immediately.

Afterward, follow the current staff and Protección Civil instructions. If significant damage is visible, do not enter a closed property to collect luggage.

At coastal destinations, learn the tsunami evacuation direction in addition to earthquake cover. A coastal quake can require a second rapid decision after the movement stops.

Distinguish a real warning from an online prediction

Earthquake myths are common: claims about the next quake occurring at a fixed time, unusual animal behaviour guaranteeing an event, or a special phone app predicting exact magnitude. There is no reliable method to predict a particular earthquake’s date, place and magnitude.

CENAPRED makes this point explicitly in its public earthquake guide. SASMEX detects a quake that is already under way; it does not foretell a future event.

Use official agency pages and note the publication time. A screenshot of an old alert can circulate during a new tremor.

Share specific sourced actions rather than panic-inducing predictions. Accurate information helps emergency services and families make better decisions.

Buildings and code compliance before the next event

A building’s seismic performance depends on engineering, construction quality, maintenance and ground conditions. A recently painted exterior is not evidence of structural integrity.

Where local regulations require structural evaluations, engage qualified professionals and follow the responsible authority’s procedures. Do not alter load-bearing walls or remove structural elements without proper design and authorisation.

Secure tall cabinets, glass items and heavy shelves so they are less likely to injure residents or block exits. Check gas connections and know how to seek professional utility assistance.

Seismic preparedness includes reducing preventable injuries before the shaking, not merely planning a meeting point afterward.

What to do about water, food and sanitation after a quake

Earthquake damage may interrupt water service or contaminate storage. Follow local drinking-water advisories and use safe supplies. Boiling may reduce microbial hazards if instructed, but does not remove many chemical contaminants.

Do not eat food that has been exposed to dangerous contaminants or lost safe refrigeration after power cuts. Follow health authority and utility guidance rather than judging by smell alone.

If sewage or water pipes are broken, stay away from exposed material and arrange qualified repairs. Children should not play near waterlogged electrical areas or structural debris.

A safe return to a home includes water, food and utility checks, not only an assessment of the walls.

Scenario 1: the SASMEX alert sounds in Mexico City

Imagine an office receives an authentic seismic alert. Workers follow the pre-established procedure, move to the identified lower-risk areas and avoid windows. Shaking begins before everyone could have reached the stairs.

The group protects themselves until movement stops, then follows building management and Protección Civil instructions for evacuation and assembly. They do not assume the alert provides a fixed 60-second window.

This is a fictional learning example, not an account of a current earthquake. It shows why the building’s practiced response matters as much as the warning sound.

Scenario 2: strong coastal shaking in Oaxaca

A family near a low-lying Pacific beach feels intense shaking. They protect their heads and stay clear of falling objects. When the shaking ends, they follow the local coastal evacuation route away from the shore toward designated higher ground.

They do not wait to see a wave or return to collect a parked motorcycle. They remain at the safe area until officials permit access.

The lesson is that earthquake protection and tsunami evacuation may be consecutive actions.

Scenario 3: a resident detects a possible gas leak

After shaking, a resident smells gas near a damaged kitchen connection. Rather than switching on the lights to inspect it, they leave the area, avoid ignition sources and contact the appropriate emergency or utility service.

Family members are kept away until professionals confirm safety. The example demonstrates that secondary utility danger may persist after the earth stops moving.

Scenario 4: an earthquake during a school day

A school class experiences shaking. The teacher instructs students to protect their heads in the designated areas, keeps them away from glass and leads them out via the safe route when movement and conditions allow.

Parents receive a message identifying the assembly location and authorised collection procedure. They do not drive through blocked streets searching for individual children.

The lesson is clear supervision and planned reunification reduce avoidable risk.

Scenario 5: people want to re-enter a cracked apartment

An apartment block develops visible cracks in a stairwell after the quake. Some residents enter because they wish to retrieve valuables and the facade looks intact.

Another household follows building and Protección Civil restrictions and waits for qualified evaluation before re-entry. Its approach recognises that a safe-looking street view does not reveal all structural damage.

The fictional example illustrates why inspection and official permission matter more than haste.

Common Mexico earthquake mistakes

“SASMEX predicts earthquakes.” It warns after a quake has begun, with variable lead time.
“Every alert gives exactly 60 seconds.” Lead times depend on the source and the alerted location.
“I should run down stairs during strong shaking.” Protect yourself first and follow the practiced building procedure.
“The doorway is always the safest place.” Safer areas depend on the building’s design and risks.
“An earthquake’s magnitude tells me whether my building is safe.” Local intensity and structural condition vary.
“If I cannot see damage, nothing was affected.” Hidden structural or utility damage is possible.
“A match is a good way to check a gas leak.” This can cause an explosion.
“The first quake is over, so there cannot be danger.” Aftershocks and falling debris may remain hazards.
“No alert means no quake.” Local events may produce shaking with little or no lead time.
“A coastal earthquake must always create a tsunami.” Not every quake does; natural warning signs and official instructions remain critical.
“A phone video reveals when the next quake will strike.” Exact earthquake prediction claims are not reliable.
“A school should release children into any nearby street.” Follow the safe reunification plan.
“A short car journey to check relatives is harmless.” Damaged roads may be needed by emergency responders.
“A public square is automatically a designated assembly point.” Use an approved locally suitable location.

Frequently asked questions

What should I do during an earthquake in Mexico?

Protect your head and neck, move away from glass and falling objects and use the nearest known lower-risk area. Do not rush onto unsafe stairs or into traffic while shaking occurs.

What is SASMEX?

It is Mexico’s earthquake early-warning system, which detects a quake already in progress and may provide variable advance warning to covered places.

Does the seismic alert always arrive before shaking?

No. Nearby events may produce shaking as the alert arrives or before it. Protect yourself immediately when shaking begins.

Who reports the magnitude of an earthquake in Mexico?

The Servicio Sismológico Nacional publishes observed earthquake information. It does not certify individual buildings as safe.

What is the emergency number in Mexico?

911 for urgent police, fire, medical and rescue assistance.

Should I use the elevator after a strong earthquake?

Avoid elevators until building systems are confirmed safe and follow the building’s official evacuation instructions. Lifts may stop or be damaged.

Is my apartment safe after an earthquake if there are cracks?

Cracks and other structural changes need qualified assessment. Avoid returning to a damaged building until the relevant authority or professional confirms safety.

What if I am on Mexico’s Pacific coast?

After very strong or long shaking, follow local tsunami evacuation routes to higher ground when safe to move. Do not wait for a visible wave if natural warning signs or official instructions require evacuation.

Can scientists predict the exact next earthquake?

No reliable method can specify a future earthquake’s exact time, location and magnitude. Follow official preparedness advice, not social-media predictions.

Official Mexico earthquake resources and related eduKate guides

Editorial review: 6 November 2026. This guide provides general emergency education, not a live SASMEX alert, earthquake forecast or engineering assessment. Follow CENAPRED and local Protección Civil instructions for your actual location.