San Ramon, California Hit by Rapid Earthquake Cluster as Magnitude 4.0 Quake Strikes East Bay Within Minutes
CALIFORNIA — A rapid sequence of earthquakes struck San Ramon in California’s East Bay late Tuesday, including a magnitude 4.0 earthquake, following at least three additional earthquakes measuring 3.0 or higher within roughly 15 minutes, according to seismic mapping data shown in the images.
The quake cluster was centered east of Danville and north of Hayward, with shaking potentially felt across surrounding communities including Walnut Creek, Concord, Fremont, Livermore, and parts of the greater San Francisco Bay Area.
Multiple Earthquakes Recorded in Short Time Span
Maps in the images show four earthquakes occurring in rapid succession, with the strongest registering magnitude 4.0 directly near San Ramon. The tight clustering of events suggests a localized seismic sequence rather than a single isolated tremor.
The quake locations appear inland, east of San Francisco Bay, and close to major population centers connected by Interstate 680 and nearby East Bay corridors, increasing the likelihood that shaking was noticed by residents.
Where Shaking May Have Been Felt
Based on proximity shown on the maps, light to moderate shaking may have been felt in:
- San Ramon
- Danville
- Walnut Creek
- Dublin and Pleasanton
- Hayward
- Fremont
- Livermore
- Parts of San Jose and the southern East Bay
No damage reports or injury information were shown in the provided data.
What a Magnitude 4.0 Earthquake Means
A magnitude 4.0 earthquake is considered light, but it is often strong enough to be clearly felt indoors, especially when occurring at shallow depth and near populated areas.
Common effects can include:
- Brief shaking of buildings
- Rattling windows and objects
- Noticeable ground movement lasting a few seconds
No Tsunami Risk and No Immediate Warnings Shown
The images do not indicate any tsunami threat, evacuation order, or emergency warning associated with this quake sequence. The earthquakes appear to be land-based events within the East Bay region.
Residents Encouraged to Stay Aware
While no further quakes are confirmed in the images, earthquake clusters can sometimes be followed by aftershocks. Residents in Contra Costa and Alameda counties are encouraged to remain alert and follow standard earthquake safety guidance.
Did you feel the shaking?
Share your experience and stay updated with local coverage at WaldronNews.com, where we continue to monitor seismic activity across California and the western United States.