Furniture straps, gas shutoff valves, structural vulnerabilities — practical steps to secure your home before the next earthquake.
Most injuries in earthquakes do not come from buildings collapsing. In well-constructed modern buildings, the primary injury mechanism is objects falling — bookshelves toppling, refrigerators sliding across kitchens, televisions launching off entertainment units, water heaters crashing through walls. These injuries are almost entirely preventable with basic preparation that costs very little and takes a weekend to complete.
The preparation measures described in this article are not for structural engineers. Most require no professional help — only basic hardware skills, a drill, and the right anchors. Where structural work is needed, specific indicators are provided.
A fully loaded bookshelf can weigh 80–150 kg. During an earthquake, lateral acceleration causes it to rock and fall forward — directly toward whoever might be standing in the room. Children are at particular risk because they are at the height that a falling bookshelf strikes.
Securing method:
Water heaters are heavy (50–100+ kg when full) and located near gas lines. An unsecured water heater that falls during an earthquake can rupture the gas connection, spilling flammable gas into the building — a primary cause of post-earthquake fires.
Code requirements: Many US states (particularly California) have legally required water heater strapping for decades. Even where not legally required, it is essential.
Strapping method:
Large refrigerators on smooth floors can move significantly during an earthquake. If they shift toward a person, the result is crush injury. If they shift away from the wall, the water line or electrical connections can be damaged.
Use non-slip mats under the feet (anti-vibration pads) combined with a strap attached to the wall through the refrigerator cabinet to a stud.
Objects stored above head height in garages, workshops, and storage areas become projectiles during an earthquake. Apply this principle systematically:
Flat-screen TVs on stands are extremely vulnerable to tipping. Options:
Natural gas leaks combined with earthquake damage (broken electrical connections, shifted stoves, open gas appliances) is the combination that caused catastrophic post-earthquake fires in San Francisco (1906) and Kobe (1995).
The main gas shutoff is located where the gas supply pipe enters your property. Typically:
If you cannot locate it, contact your gas utility — they will show you.
Keep the area around the shutoff clear. An accessible shutoff that is blocked by stored items is useless in an emergency.
Keep a shutoff tool available. Most gas meters use a quarter-turn valve that requires a crescent wrench or a dedicated gas shutoff tool (approximately $5) to operate. Tape the tool to the pipe near the meter.
⚠️ Only shut off your gas if you smell gas, hear gas hissing, suspect a leak, or see visible pipe damage. Do not shut off gas "just in case" — the utility company must restore gas service and relight all pilot lights. Unnecessary shutoffs during a wide-area event can leave you without gas for days or weeks while crews manage thousands of other properties.
Seismic-activated automatic gas shutoff devices detect ground shaking above a set threshold and close the gas supply automatically — before you even know the earthquake happened. They are:
A "soft storey" is a floor in a multi-storey building that has significantly less lateral stiffness than the floors above and below it. The most common example is a residential apartment building with a ground-floor car park or open-ground-floor retail space — walls of glass and open space below, residential units with shear walls above.
In an earthquake, the soft storey acts as a hinge. The upper floors remain relatively intact while the soft storey collapses. Dozens of people have been killed in soft-storey collapses in earthquakes where better-constructed buildings nearby survived.
Identifying soft-storey risk:
If you live in a soft-storey building, enquire with the building owner or local government about retrofit status. Many cities (Los Angeles, San Francisco, Seattle) have mandatory soft-storey retrofit ordinances.
Brick, adobe, and concrete block buildings constructed without internal reinforcing steel are among the most dangerous structures in earthquakes. Mortar between bricks or blocks does not hold well under dynamic lateral forces. URM walls crack, separate, and can collapse outward — a hazard to occupants and to anyone outside the building.
Signs you may be in a URM building:
Cripple walls are short wood-frame walls between the foundation and the first floor — common in homes built before 1940. They can collapse sideways during an earthquake, causing the entire house to drop off its foundation.
Retrofit: Plywood sheathing added to the interior of cripple walls provides dramatic improvement in resistance. This is a common DIY or low-cost contractor retrofit project.
Garage doors span large openings. The wall area above the garage door is often understructured. During an earthquake, the portal frame of a garage can rack (distort sideways), damaging the garage structure and creating hazards.
Solutions include portal frame reinforcement kits designed for garage openings. A structural engineer can advise on the specific requirements for your garage configuration.
| Task | DIY Appropriate | Engineer Recommended |
|---|---|---|
| Furniture strapping | Yes | No |
| Water heater strapping | Yes | No |
| Gas shutoff tool installation | Yes | No |
| Automatic gas shutoff device | No (needs plumber) | Optional |
| Cripple wall plywood sheathing | Yes, with permit | Confirm design with engineer first |
| Soft-storey retrofit | No | Yes — complex engineering required |
| Foundation crack assessment | Visual inspection only | Engineer for any significant cracking |
| URM wall reinforcement | No | Yes |
| Post-earthquake damage assessment | Basic visual | Engineer for any structural concern |
| Foundation Type | Seismic Performance | Notes |
|---|---|---|
| Reinforced concrete slab on grade | Generally good | Can crack in severe events; usually not life-threatening |
| Reinforced concrete perimeter + posts | Good if properly constructed | Check for bolt connections between sill plate and foundation |
| Unreinforced concrete or masonry | Poor | High risk of failure in major events |
| Cripple wall on perimeter concrete | Moderate risk | Retrofit with plywood significantly improves performance |
| Raised floor on wooden stumps | Variable | Stump connections and bracing critical |
The connection between the building's wooden sill plate and the foundation is critical. Buildings bolt-connected to their foundations perform far better than those simply resting on the foundation (common in older construction).
Checking your connection: In your crawl space or basement, look along the sill plate (the lowest horizontal timber) for bolt heads passing through into the foundation. If you cannot find bolts, your building may not be anchored — consult a structural engineer.
| Situation | Action |
|---|---|
| Bookshelf not secured | Install L-bracket or strap to wall stud — do today |
| Water heater not strapped | Install dual-strap kit; this is code in many areas |
| Heavy objects on high shelves | Move heavy items below waist height |
| Cannot find gas shutoff | Call gas utility to show you the location now |
| Gas shutoff requires tools | Tape a crescent wrench or shutoff key to the meter pipe |
| Smell gas after earthquake | Do not touch switches; leave building; call gas utility |
| Want automatic gas shutoff | Have plumber install seismic-activated shutoff valve |
| Live in older brick building | Ask building manager about URM retrofit status |
| Ground-floor parking under apartments | Ask about soft-storey retrofit compliance |
| Older home on stumps with no cripple wall | Check for foundation bolts; consult engineer |
| Any structural crack in foundation | Contact licensed structural engineer for assessment |
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