Earthquakes risk in Massachusetts

Earthquake Risk in Massachusetts: What Homeowners Should Know

Massachusetts is not located near a major tectonic plate boundary, so the overall earthquake hazard is considered low to moderate. The state is rated level 2 of 5 on the FEMA National Risk Index, meaning the expected annual loss from earthquake shaking is relatively small but not negligible.

Earthquakes in Massachusetts are typically associated with ancient fault lines and zones of crustal weakness, such as the Northern Appalachian region. Small to moderate tremors occur every few years, and occasionally a slightly stronger event can be felt across multiple towns. For example, in 2020 a magnitude 3.6 earthquake near the Massachusetts-New Hampshire border was felt widely, though damage was minimal. The most active areas in terms of recorded seismicity include the area around Newburyport, the Boston Basin, and parts of western Massachusetts near the Berkshires.

Unlike hazards such as hurricanes or nor'easters, earthquakes have no season. They can strike at any time, day or night, with little to no warning. The shaking itself is the primary hazard, and while large, damaging quakes are rare, even a moderate tremor can topple unsecured furniture, crack plaster, or shift appliances. Because Massachusetts soil varies from rocky outcrops to soft sediments, some pockets may experience stronger shaking due to local site conditions.

The Massachusetts Emergency Management Agency (MEMA) coordinates the state's response to earthquakes and encourages residents to follow the same "Drop, Cover, and Hold On" guidance recommended nationwide by the USGS and Ready.gov.

How It Affects Homes

Most homes in Massachusetts are built to withstand the region's typical weather and structural loads, but earthquake shaking introduces forces that buildings may not have been designed to handle, especially older homes. The most common damage from a moderate earthquake includes cracked drywall or plaster, broken windows, and damage to chimneys and brick veneers. Homes with crawl spaces or basements may see shifting of support posts or cracked foundation walls, particularly if the structure is older and not bolted to its foundation.

Contents inside a home can also be a major source of injury and damage. Unsecured bookcases, televisions, water heaters, and heavy furniture can tip over during shaking. Gas lines and water pipes may rupture, leading to fires or water damage.

Regarding insurance, standard homeowners insurance policies in Massachusetts generally do not cover earthquake damage. This is true for most states. Earthquake coverage is typically available as an add-on endorsement or as a separate policy, often offered through the Massachusetts Property Insurance Underwriting Association (FAIR Plan) for those who cannot find coverage in the voluntary market. Given the state's low-to-moderate risk, earthquake insurance may be an optional purchase, but it is worth considering if you own an older home, a home with masonry construction, or if you want to reduce out-of-pocket costs after a seismic event. The Federal Emergency Management Agency (FEMA) and Ready.gov both recommend that homeowners check their policies and understand what is excluded.

How to Prepare Your Home

Even in a low-risk state, a few simple mitigation steps can make your home safer and reduce the chance of damage during an earthquake. Here are concrete recommendations from FEMA and Ready.gov:

• Secure heavy furniture. Anchor bookcases, armoires, tall cabinets, and shelves to wall studs using brackets or earthquake-resistant straps.
• Install latches on cabinets. Use childproof or positive-sensing latches to keep cabinet doors closed and prevent dishes or glassware from crashing out.
• Strap your water heater. Use metal strapping to secure the water heater to wall studs to prevent it from tipping and rupturing gas or water lines.
• Use flexible connectors. Install flexible gas and water supply lines to reduce the risk of leaks during ground movement.
• Secure electronics and small appliances. Use non-slip pads or straps for televisions, computers, and microwaves.
• Check your foundation. If your home is elevated or has a crawl space, consider having a professional inspect whether the sill plate is bolted to the foundation. Retrofitting can greatly improve stability.
• Store breakables safely. Put heavy or breakable items on lower shelves, and use putty or museum wax to secure valuables.
• Keep a fire extinguisher. Have at least one multipurpose (ABC) fire extinguisher accessible in case of a small fire caused by ruptured lines.
• Make a family plan. Practice "Drop, Cover, and Hold On" with your household, and choose a safe meeting point outside.
• Prepare an emergency kit. Stock water, non-perishable food, flashlights, a radio, medications, and a first-aid kit to sustain your family for at least 72 hours.

Frequently Asked Questions

Can earthquakes cause significant damage in Massachusetts?

While large, destructive earthquakes are rare, moderate tremors can still cause minor damage such as cracked plaster, fallen chimneys, and toppled furniture. The risk is real enough that MEMA and federal agencies encourage basic preparedness, but it is much lower than in states like California or Alaska.

Is earthquake insurance worth it in Massachusetts?

Because standard homeowners policies exclude earthquake damage, purchasing a separate earthquake endorsement may be worthwhile for peace of mind, especially if you have an older home, a challenging mortgage, or limited savings for unexpected repairs. The annual cost is generally lower than in high-risk states, but it depends on your insurer and the specifics of your home. Consult with your insurance provider to compare costs and coverage.

What should I do during an earthquake if I am indoors?

Follow the advice of Ready.gov and the USGS: "Drop, Cover, and Hold On." Drop to your hands and knees, cover your head and neck under a sturdy table or desk if you can, and hold on until the shaking stops. Stay away from windows and exterior walls. If you are in bed, stay there and protect your head with a pillow. If you are outdoors, move to an open area away from buildings and power lines.

Official Resources

• Massachusetts Emergency Management Agency (MEMA)
• USGS Earthquake Hazards Program
• Ready.gov – Earthquakes
• FEMA Earthquake Safety