Updated

Updated · KABC-TV · Jun 26

Mendocino County 5.6 Quake Damages 2 Buildings as Experts Reject Link to 6 Global Tremors

Updated

Updated · KABC-TV · Jun 26

Mendocino County 5.6 Quake Damages 2 Buildings as Experts Reject Link to 6 Global Tremors

Q: This earthquake struck a northern branch of the Hayward Fault. Does this relieve pressure or raise the risk for the Bay Area?

It does not meaningfully “relieve pressure” on the Bay Area’s Hayward Fault, and in the short term it may slightly change stress on nearby connected faults, though not in a way that clearly raises Bay Area danger. The Mendocino County quake appears to have struck the Maacama Fault, a northern part of the broader Hayward-Rodgers Creek-Maacama system. Seismologists generally caution that earthquakes do not act like a simple pressure valve for an entire fault network. A magnitude 5.6 releases energy locally, but it is far too small and too far north to drain the accumulated strain that worries scientists on the main Hayward Fault in the East Bay. Experts describe these faults as part of a diffuse plate-boundary zone, where stress is distributed across many faults. That means one quake can slightly redistribute stress, sometimes increasing it on one segment and decreasing it on another. But those changes are usually subtle, and there is no evidence from this event alone that the Bay Area’s immediate earthquake risk has sharply increased. The broader Bay Area hazard remains what it was before: the Hayward Fault is still considered one of the region’s most dangerous faults and is thought to be carrying substantial long-term strain. The Willits quake is notable because it was the largest on that fault section in roughly 75 years, but it should be seen mainly as a reminder that the whole northern California fault system is active, not as a sign that the Bay Area is now safer.

3 articles · Updated · KABC-TV · Jun 26

At least two buildings in Mendocino County, including a Grocery Outlet in Willits, sustained structural damage after Wednesday's 5.6 earthquake, though city officials reported no injuries and power has been restored.
Inspectors were checking buildings and helping businesses reopen after the quake sent merchandise crashing off shelves and rattled facilities including the Milo Foundation animal rescue sanctuary.
Six strong earthquakes struck around the world within hours, prompting questions about a connection to the Northern California event.
UC Berkeley seismologist Angela Lux said the overseas quakes were too distant to have directly influenced the Mendocino shock, calling the timing most likely coincidental.
The shaking still underscored California's standing preparedness advice: drop, cover and hold on rather than running outside or standing in a doorway.