Home Insurance and the Earth Movement Exclusion Explained

The Full Scope of the Earth Movement Exclusion

The standard HO-3 policy language excludes loss caused by "earthquake, including land shock waves or tremors before, during, or after a volcanic eruption; landslide; mine subsidence; mudflow; earth sinking, rising, or shifting." This language is deliberately comprehensive. Any movement of the ground, whether vertical (sinking or rising), horizontal (shifting or sliding), sudden (earthquake, landslide), or gradual (settling, subsidence, erosion), falls within the exclusion.

The exclusion applies regardless of the cause of the earth movement. Natural geological processes (tectonic activity, karst dissolution, erosion), human-caused ground disturbances (mining, fracking, construction vibration, irrigation changes), and weather-related ground events (rain-saturated hillside collapse, frost heave, permafrost melt) are all excluded. Some homeowners have argued in court that human-caused earth movement should not be excluded because it is not a "natural" event, but most courts have upheld the exclusion regardless of the cause.

Types of Earth Movement and Their Impact

Landslides and Mudflows

Landslides occur when gravity pulls soil, rock, or debris down a slope. They can be triggered by heavy rain, earthquakes, volcanic eruptions, or human activity that destabilizes a hillside. Mudflows (also called debris flows) are rapid movements of water-saturated earth. The standard policy excludes both, with one narrow exception: mudflow caused by volcanic eruption may be covered under the volcanic eruption provision in some policies.

Landslide damage to a home can range from cracked foundations and shifted walls ($10,000 to $50,000 in repairs) to total structural loss when the home slides off its foundation or is buried by debris. Hillside properties in California, the Pacific Northwest, Appalachia, and coastal bluffs face the highest landslide risk.

Subsidence and Settling

Subsidence is the gradual sinking or settling of the ground surface. It occurs when underground material is removed or compressed, creating voids that the surface eventually collapses into. Causes include groundwater withdrawal, oil and gas extraction, mining, natural cave formation in limestone bedrock, and decomposition of organic soil. Foundation settling, a related phenomenon, occurs when the soil beneath a foundation compresses or shifts under the weight of the structure.

Subsidence and settling cause foundation cracks, uneven floors, sticking doors and windows, and structural misalignment. Repair costs range from $5,000 for minor crack injection to $50,000 or more for underpinning and foundation stabilization. None of this damage is covered by the standard homeowners policy.

Erosion

Erosion is the gradual removal of soil by water, wind, or ice. Coastal erosion threatens homes built near shorelines, while river bank erosion threatens properties along waterways. Erosion undermines foundations, destabilizes slopes, and can eventually cause structural collapse. The standard policy excludes erosion damage both under the earth movement exclusion and under the gradual damage exclusion. Homes in coastal areas face the dual threat of erosion and rising sea levels, neither of which is insurable through standard markets.

Mine Subsidence

In states with historical or active mining operations, mine subsidence (the collapse of underground mine tunnels causing the surface to sink) is a specific risk. Pennsylvania, West Virginia, Illinois, Indiana, Kentucky, and parts of other mining states have properties affected by mine subsidence. Several states offer mine subsidence insurance through state-run programs. Pennsylvania's Mine Subsidence Insurance Fund provides coverage up to $300,000 for an annual premium of $58 to $315 depending on the dwelling value. These state programs are the only coverage option for mine subsidence damage.

Coverage Options for Earth Movement

Earthquake insurance. Available as a separate policy or endorsement, covering seismic damage. Deductibles are percentage-based (10% to 25%). Available through private insurers and state programs like the California Earthquake Authority.

Sinkhole coverage. Available primarily in Florida and a few other states. Florida mandates that insurers offer sinkhole coverage and include catastrophic ground cover collapse. Available as an endorsement with premiums varying dramatically by location.

Mine subsidence insurance. Available through state-run programs in several mining states. Affordable premiums ($58 to $315 per year in Pennsylvania) for coverage up to $300,000.

Difference in conditions (DIC) policy. A specialized policy that covers perils excluded from the standard homeowners policy, including earth movement, flood, and other excluded events. DIC policies are available from specialty insurers and are more expensive than individual endorsements but provide broader coverage. They are most commonly used for high-value properties in areas with multiple excluded risks.

When Resulting Damage May Be Covered

Some policies include an "ensuing loss" or "resulting damage" clause that covers damage from a covered peril that occurs after an excluded earth movement event. For example, if an earthquake ruptures a gas line and the resulting fire destroys the home, the fire damage may be covered because fire is a covered peril, even though the earthquake is excluded. The earth movement (ground shaking) damage is excluded, but the fire damage that followed is covered.

This ensuing loss provision does not apply universally. Some insurers have modified their policy language to limit or eliminate ensuing loss coverage for earth movement events. Read your policy's earth movement exclusion carefully, paying particular attention to any "ensuing loss" or "resulting damage" language that follows the exclusion.