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Minor earthquake, 3.81 mag was detected near San Ramon in CA

Posted by admin on December 20, 2025 0 Comments

A minor earthquake magnitude 3.81 (ml/mb) has struck on Saturday, 5 kilometers (3 miles) from San Ramon in CA. Date and time of earthquake in UTC/GMT: 20/12/25 / 2025-12-20 03:49:22 / December 20, 2025 @ 3:49 am. Exact location of earthquake, -121.9375° West, 37.748832702637° North, depth 9.3000001907349 km. The 3.81-magnitude earthquake has occurred at 03:49:22 / 3:49 am (local time epicenter). The epicenter of the earthquake was roughly 9.3000001907349 km (6 miles) below the earth’s surface. Id of earthquake: nc75283011. Event ids that are associated: nc75283011.

Epicenter of the earthquake 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). Closest city/cities/towns to epicentrum/hypocenter was Elk Grove, Riverbank, Ceres (min 5000 pop). Country/countries that might be effected, United States (c. 310 233 000 pop).

In the past 24 hours, there have been two, in the last 10 days nine, in the past 30 days twenty-two and in the last 365 days sixty-two earthquakes of magnitude 3.0 or greater that have been detected 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.

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Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 5 km SE of San Ramon, CA. This data comes from the USGS Earthquake Notification Service.

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

More information

Parameter	Value	Description
Magnitude	3.81 mb	The magnitude for the event.
Longitude	-121.9375° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.748832702637° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	9.3000001907349 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	2025-12-20 03:49:22	Time when the event occurred. UTC/GMT
Updated	2025-12-20 03:54:49	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	12	The total number of felt reports
CDI	3.8	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	228	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	77	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1016	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	36	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	nc75283011	Id of event.
Event Code	75283011	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75283011,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.81 mag was detected near San Ramon in CA

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