Minor earthquake, 3.86 mag has occurred near San Ramon in CA

A minor earthquake magnitude 3.86 (ml/mb) has occurred on Sunday, 5 kilometers (3 miles) from San Ramon in CA. The temblor was picked up at 02:31:54 / 2:31 am (local time epicenter). Global date and time of event UTC/GMT: 21/12/25 / 2025-12-21 02:31:54 / December 21, 2025 @ 2:31 am. Id of earthquake: nc75283691. Event ids that are associated: nc75283691. Exact location of earthquake, -121.93883514404° West, 37.74983215332° North, depth 9.6000003814697 km. The earthquake was roughly at a depth of 9.6000003814697 km (6 miles).

Nearest cities/city/villages to epicentrum/hypocenter was Elk Grove, Riverbank, Ceres (min 5000 pop). The epicenter was 46 km (28 miles) from San Jose (c. 945 900 pop), 42 km (26 miles) from San Francisco (c. 805 200 pop), 30 km (19 miles) from Oakland (c. 390 700 pop), 61 km (38 miles) from Stockton (c. 291 700 pop), 23 km (14 miles) from Fremont (c. 214 100 pop), 84 km (52 miles) from Modesto (c. 201 200 pop). Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected).

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

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city 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: 5 km SE of San Ramon, CA.

CA Ceres Elk Grove Fremont Modesto Oakland Riverbank San Francisco San Jose San Ramon Stockton United States

More information

Parameter	Value	Description
Magnitude	3.86 mb	The magnitude for the event.
Longitude	-121.93883514404° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.74983215332° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	9.6000003814697 km	Depth of the event in kilometers.
Place	5 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	2025-12-21 02:31:54	Time when the event occurred. UTC/GMT
Updated	2025-12-21 02:37:36	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	25	The total number of felt reports
CDI	4.8	The maximum reported intensity for the event.
MMI	3.868	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	reviewed	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	241	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	96	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1006	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.14 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	24	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	ml	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	nc75283691	Id of event.
Event Code	75283691	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75283691,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.86 mag has occurred near San Ramon in CA

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