Minor earthquake, 3.45 mag has occurred near Clayton in CA

A minor earthquake with magnitude 3.45 (ml/mb) was reported 8 kilometers (5 miles) from Clayton in CA on Monday. The 3.45-magnitude earthquake was detected at 22:00:08 / 10:00 pm (local time epicenter). The epicenter of the earthquake was roughly 6.4899997711182 km (4 miles) below the earth’s surface. Exact location of event, depth 6.4899997711182 km, -121.84783172607° West, 37.941833496094° North. Global date and time of event UTC/GMT: 15/09/25 / 2025-09-15 22:00:08 / September 15, 2025 @ 10:00 pm. Event id: nc75238127. Ids that are associated to the earthquake: nc75238127.

Earthquake epicenter was 67 km (42 miles) from San Jose (c. 945 900 pop), 53 km (33 miles) from San Francisco (c. 805 200 pop), 78 km (48 miles) from Sacramento (c. 466 500 pop), 40 km (25 miles) from Oakland (c. 390 700 pop), 49 km (30 miles) from Stockton (c. 291 700 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Riverbank, Bret Harte, Saint Helena. Nearby country/countries that might be effected, United States (c. 310 233 000 pop).

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

Did you feel the quake?

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. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 8 km E of Clayton, CA. This information comes from the USGS Earthquake Notification Service.

Bret Harte CA Clayton Oakland Riverbank Sacramento Saint Helena San Francisco San Jose Stockton United States

More information

Parameter	Value	Description
Magnitude	3.45 mb	The magnitude for the event.
Longitude	-121.84783172607° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.941833496094° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	6.4899997711182 km	Depth of the event in kilometers.
Place	8 km E of Clayton, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-09-15 22:00:08	Time when the event occurred. UTC/GMT
Updated	2025-09-15 22:07:04	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	7	The total number of felt reports
CDI	3.4	The maximum reported intensity for the event.
MMI	3.255	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	185	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	87	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.05539	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.21 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	80	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	nc75238127	Id of event.
Event Code	75238127	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75238127,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.45 mag has occurred near Clayton in CA

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