Minor earthquake: M2.98 quake has struck near San Ramon in CA

A minor earthquake magnitude 2.98 (ml/mb) strikes 4 kilometers (2 miles) from San Ramon in CA on Sunday. Exact location of earthquake, longitude -121.94366455078 West, latitude 37.750831604004 North, depth = 9.9399995803833 km. The epicenter of the earthquake was roughly 9.9399995803833 km (6 miles) below the earth’s surface. The temblor was picked up at 02:53:47 / 2:53 am (local time epicenter). Exact time and date of earthquake 21/12/25 / 2025-12-21 02:53:47 / December 21, 2025 @ 2:53 am UTC/GMT. All ids that are associated to the event: nc75283726. Unique identifier: nc75283726.

Earthquake epicenter was 46 km (29 miles) from San Jose (c. 945 900 pop), 42 km (26 miles) from San Francisco (c. 805 200 pop), 29 km (18 miles) from Oakland (c. 390 700 pop), 62 km (38 miles) from Stockton (c. 291 700 pop), 23 km (14 miles) from Fremont (c. 214 100 pop). Close country/countries that might be effected, United States (c. 310 233 000 pop). Nearest cities/city/towns to hypocenter/epicentrum was Patterson, Boyes Hot Springs, Scotts Valley (min 5000 pop).

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

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What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 4 km SE of San Ramon, CA. This data comes from the USGS Earthquake Notification Service.

Boyes Hot Springs CA Fremont Oakland Patterson San Francisco San Jose San Ramon Scotts Valley Stockton United States

More information

Parameter	Value	Description
Magnitude	2.98 mb	The magnitude for the event.
Longitude	-121.94366455078° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.750831604004° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	9.9399995803833 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	2025-12-21 02:53:47	Time when the event occurred. UTC/GMT
Updated	2025-12-21 02:58:10	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	137	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	85	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.09695	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.13 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	25	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	nc75283726	Id of event.
Event Code	75283726	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75283726,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake: M2.98 quake has struck near San Ramon in CA

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