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

A minor earthquake magnitude 2.91 (ml/mb) has occurred on Saturday, 4 kilometers (2 miles) from San Ramon in CA. The earthquake was roughly at a depth of 8.0900001525879 km (5 miles). The temblor was picked up at 04:10:00 / 4:10 am (local time epicenter). All ids that are associated to the event: nc75283086. Unique identifier: nc75283086. Date and time of earthquake in UTC/GMT: 20/12/25 / 2025-12-20 04:10:00 / December 20, 2025 @ 4:10 am. Exact location of earthquake, -121.94850158691° West, 37.749168395996° North, depth 8.0900001525879 km.

The epicenter was 46 km (28 miles) from San Jose (c. 945 900 pop), 41 km (26 miles) from San Francisco (c. 805 200 pop), 29 km (18 miles) from Oakland (c. 390 700 pop), 62 km (39 miles) from Stockton (c. 291 700 pop), 23 km (14 miles) from Fremont (c. 214 100 pop). Nearest cities/city/villages to epicentrum/hypocenter was Salida, Sonoma, Ben Lomond (min 5000 pop). Nearby country/countries that might be effected, United States (c. 310 233 000 pop).

In the past 24 hours, there have been five, in the last 10 days twelve, in the past 30 days twenty-five and in the last 365 days sixty-five earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. There are an estimated 130,000 minor earthquakes in the world each year.

Did you feel it?

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. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 4 km SE of San Ramon, CA.

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

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Parameter	Value	Description
Magnitude	2.91 mb	The magnitude for the event.
Longitude	-121.94850158691° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.749168395996° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	8.0900001525879 km	Depth of the event in kilometers.
Place	4 km SE 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	2025-12-20 04:10:00	Time when the event occurred. UTC/GMT
Updated	2025-12-20 04:15:12	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	78	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.09293	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.22 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	36	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	nc75283086	Id of event.
Event Code	75283086	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75283086,	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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