Seismic Event Overview
A magnitude 5.6 earthquake struck Northern California on Wednesday morning, June 24, 2026, centered approximately 7 miles north of Redwood Valley in Mendocino County. According to the U.S. Geological Survey (USGS), the tremor occurred at 8:10 a.m. at a depth of about 5 miles. The initial event was followed by a magnitude 2.5 aftershock at 8:17 a.m.
Infrastructure and Emergency Response
The California Governor’s Office of Emergency Services confirmed that nearly 657,000 earthquake alerts were dispatched via the MyShake app. While no widespread injuries have been reported, the Mendocino County Sheriff’s Office is currently assessing damage. Reports from the region indicate significant shaking inside a local gas station in Redwood Valley. Additionally, more than 7,600 utility customers were without power as of 9:00 a.m., with authorities still investigating the cause of the outages.
System Performance
The ShakeAlert early warning system functioned as designed, providing critical lead time to residents across the region, including reports of shaking felt as far away as Modesto. The National Tsunami Warning Center confirmed that there is no tsunami threat associated with the seismic activity. State officials continue to coordinate with local emergency crews to monitor the situation and evaluate potential infrastructure damage.