Minor earthquake, 2.91 mag was detected near San Ramon in CA

A minor earthquake magnitude 2.91 (ml/mb) strikes 4 kilometers (2 miles) from San Ramon in CA on Saturday. The epicenter of the earthquake was roughly 7.9099998474121 km (5 miles) below the earth’s surface. Exact location of earthquake, -121.938331604° West, 37.76250076294° North, depth 7.9099998474121 km. The 2.91-magnitude earthquake has occurred at 21:44:08 / 9:44 pm (local time epicenter). Event id: nc75279301. Ids that are associated to the earthquake: nc75279301. Exact time and date of event in UTC/GMT: 13/12/25 / 2025-12-13 21:44:08 / December 13, 2025 @ 9:44 pm.

Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). Closest city/cities/towns to epicentrum/hypocenter was Dixon, Ben Lomond, Salida (min 5000 pop). Epicenter of the earthquake was 47 km (29 miles) from San Jose (c. 945 900 pop), 42 km (26 miles) from San Francisco (c. 805 200 pop), 30 km (18 miles) from Oakland (c. 390 700 pop), 61 km (38 miles) from Stockton (c. 291 700 pop), 24 km (15 miles) from Fremont (c. 214 100 pop).

Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. In the past 24 hours, there have been one, in the last 10 days four, in the past 30 days fifteen and in the last 365 days fifty-three earthquakes of magnitude 3.0 or greater that has struck near. There are an estimated 130,000 minor earthquakes in the world each year.

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Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 4 km ESE of San Ramon, CA.

Ben Lomond CA Dixon Fremont Oakland Salida San Francisco San Jose San Ramon Stockton United States

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Parameter	Value	Description
Magnitude	2.91 mb	The magnitude for the event.
Longitude	-121.938331604° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.76250076294° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	7.9099998474121 km	Depth of the event in kilometers.
Place	4 km ESE of San Ramon, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-12-13 21:44:08	Time when the event occurred. UTC/GMT
Updated	2025-12-13 21:45:46	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	automatic	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	130	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	nc	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,nc,	A comma-separated list of network contributors.
Number of Stations Used	34	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1033	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.07 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	49	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	md	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	nc75279301	Id of event.
Event Code	75279301	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75279301,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 2.91 mag was detected near San Ramon in CA

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