California homeowners already have wildfire, rising insurance costs, and property values to think about. Now, new earthquake research is putting another major risk back in the spotlight.
A 2026 scientific study of Southern California’s San Andreas and San Jacinto fault systems found that portions of these faults are currently carrying extremely high levels of accumulated tectonic stress. Researchers reconstructed approximately 1,000 years of earthquake history and modeled how stress accumulated and was released over time.
The findings are significant for Southern California residents — particularly homeowners in Los Angeles, Orange County, Riverside, San Bernardino and the surrounding region.
But there is an important point to understand:
Scientists are NOT predicting that a major earthquake will happen tomorrow, next month, or even this year.
Earthquakes still cannot be reliably predicted by date and time. The research instead gives scientists a better understanding of how much stress may currently exist within major Southern California fault systems.
What Did Scientists Discover?
Researchers created a four-dimensional earthquake-cycle model using approximately 1,000 years of paleoseismic earthquake history along the southern San Andreas Fault System.
The study focused heavily on the Cajon Pass, where the San Andreas and San Jacinto fault systems interact.
Researchers estimated that by 2025, Coulomb stress had reached approximately:
- 2.8 MPa on the Mojave South segment
- 1.8 MPa on the North San Bernardino segment
- 3.6 MPa on the San Jacinto Bernardino segment
The study compared those values with stress ranges associated with previous earthquakes and found today’s conditions noteworthy.
In other words, these faults have been accumulating significant tectonic stress.
Why Is Cajon Pass So Important?
One of the most interesting findings involves Cajon Pass, northeast of Los Angeles.
The area is essentially a critical junction between the San Andreas and San Jacinto fault systems.
Researchers found evidence that the relative stress on different fault segments may influence whether an earthquake rupture stops around this complicated junction or continues through it.
When stress levels on certain segments become more similar, historical modeling suggests the faults may be more capable of rupturing together.
That matters because a rupture involving multiple fault segments could potentially affect a much larger area than an earthquake confined to a shorter portion of one fault.
Does This Mean “The Big One” Is About to Happen?
No.
This research should not be interpreted as an earthquake prediction.
Scientists can measure fault movement, study previous earthquakes, monitor crustal deformation and model stress accumulation, but they still cannot tell us precisely when a particular fault will rupture.
The USGS explains that the continuing motion of the Pacific and North American tectonic plates means stress continually accumulates in California’s crust. Two major areas of concentrated stress include the San Andreas Fault zone and the Eastern California Shear Zone.
The new research improves our understanding of the hazard. It doesn’t provide a countdown clock.
Southern California Has Experienced Long Periods Between Major Earthquakes
Some portions of the San Andreas have gone a very long time without a major rupture.
For example, previous USGS research found evidence of 10 ground-rupturing earthquakes over roughly 1,200 years near Frazier Mountain, with large earthquakes there occurring approximately every 100 years on average over that historical record.
Farther south, research near Coachella found evidence of at least five and possibly seven major earthquakes over roughly 1,100 years, with a best-estimate average recurrence interval of approximately 180 years.
Earthquakes don’t operate on a calendar, however. An average recurrence interval does not mean an earthquake becomes “overdue” on a specific date.
What Does This Mean for California Homeowners?
The research is another reminder that earthquake risk is something California property owners should take seriously.
And there is an insurance issue that many homeowners don’t realize until it’s too late:
Standard Homeowners Insurance Generally Does Not Cover Earthquake Damage
Your regular homeowners, condo or rental-property policy generally excludes damage caused by earth movement, including earthquakes.
That means someone could have excellent homeowners insurance and still have a significant gap in protection following a major earthquake.
Separate earthquake insurance may provide protection for areas such as:
🏠 Dwelling
Coverage to repair or rebuild the insured structure following covered earthquake damage.
🛋️ Personal Property
Coverage for belongings damaged by an earthquake, subject to the policy’s limits and deductible.
🏨 Loss of Use
Coverage that may help with additional living expenses when a covered earthquake makes your home uninhabitable.
Coverage, deductibles, exclusions and limits vary significantly by policy, so homeowners should review the actual contract rather than assume they are protected.
What About Condo Owners?
Earthquake coverage can be especially important for condo and townhome owners.
The HOA’s master insurance policy doesn’t necessarily cover everything inside your unit or every assessment the association could impose following earthquake damage.
Depending on the earthquake policy selected, a condo owner may be able to obtain protection for areas such as:
- Interior improvements
- Personal property
- Loss of use
- Certain HOA loss assessments
The appropriate limits depend heavily on the HOA master policy and the owner’s financial exposure.
What About California Earthquake Authority Coverage?
The California Earthquake Authority (CEA) is one of the major sources of residential earthquake coverage in California.
CEA policies are sold through participating residential insurance companies rather than directly by CEA.
Homeowners should compare more than just premium. The deductible, dwelling limit, personal-property protection, loss-of-use coverage and other available options can dramatically affect how much protection a policy actually provides after a major earthquake.
Earthquake Deductibles Work Differently
Another important issue is the deductible.
Earthquake policies commonly use percentage deductibles rather than the simple dollar deductibles homeowners may be accustomed to seeing on regular home insurance.
For example, a percentage deductible on a high-value home can represent a substantial amount of money the homeowner must absorb before certain coverage responds.
This is why the cheapest earthquake policy isn’t automatically the best policy.
Should You Buy Earthquake Insurance?
There isn’t one answer for every California homeowner.
Consider factors such as:
Your home’s replacement cost — How much would it cost to rebuild?
Your equity — How much of your net worth is tied up in the property?
Your location — How close are you to significant faults and what are the local soil conditions?
Your home’s construction — Age, foundation, number of stories and structural characteristics can affect vulnerability.
Your emergency reserves — Could you financially handle major earthquake repairs yourself?
Your mortgage — Even if a home is badly damaged, the mortgage generally doesn’t disappear.
The real question is:
“If a major earthquake severely damaged my home tomorrow, could I afford to rebuild without earthquake insurance?”
For many California homeowners, that’s worth discussing.
Don’t Panic — Prepare
Headlines such as “California Fault Stress Hits Highest Level in 1,000 Years” understandably get people’s attention.
The appropriate response isn’t panic.
It’s preparation.
Review your homeowners policy. Understand what earthquake damage it excludes. Consider whether separate earthquake coverage makes sense. Review your deductible and emergency savings. Secure heavy furniture and water heaters, and develop a family emergency plan.
California has always been earthquake country. New research simply gives us a better picture of the forces continuously building beneath us.
Need Help Reviewing Your California Earthquake Insurance Options?
At StarWest Insurance Services, we can help California homeowners compare their existing coverage and determine whether earthquake insurance makes sense for their property.
We can help with:
Homeowners Insurance • Condo Insurance • Landlord Insurance • Earthquake Insurance • California FAIR Plan • DIC Coverage • Auto • Business • Life & Financial Services
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Contact us for an earthquake insurance review and find out how much coverage may be appropriate for your home.