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Minor earthquake, 2.88 mag strikes near San Ramon in CA

Posted by admin on December 8, 2025 0 Comments

Earthquake location 37.761833190918S, -121.93983459473WA minor earthquake magnitude 2.88 (ml/mb) has occurred on Monday, 4 kilometers (2 miles) from San Ramon in CA. The 2.88-magnitude earthquake was detected at 18:06:44 / 6:06 pm (local time epicenter). Exact location of event, longitude -121.93983459473 West, latitude 37.761833190918 North, depth = 8.25 km. The earthquake was roughly at a depth of 8.25 km (5 miles). Date and time of earthquake in UTC/GMT: 08/12/25 / 2025-12-08 18:06:44 / December 8, 2025 @ 6:06 pm. Id of earthquake: nc75276741. Event ids that are associated: nc75276741.

Earthquake epicenter was 47 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), 61 km (38 miles) from Stockton (c. 291 700 pop), 24 km (15 miles) from Fremont (c. 214 100 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Dixon, Ben Lomond, Salida. Country/countries that might be effected, United States (c. 310 233 000 pop).

There are an estimated 1,300,000 minor quakes in the world each year. In the past 24 hours, there have been three, in the last 10 days six, in the past 30 days twenty-one and in the last 365 days fifty-two earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 2.5 to 2.9 are often felt, but only causes minor damage.

Did you feel the quake?

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. 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: 4 km ESE of San Ramon, CA.

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More information

Parameter Value Description
Magnitude 2.88 mb The magnitude for the event.
Longitude -121.93983459473° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.761833190918° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 8.25 km Depth of the event in kilometers.
Place 4 km ESE 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 2025-12-08 18:06:44 Time when the event occurred. UTC/GMT
Updated 2025-12-08 18:10:42 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 2 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 128 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 55 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.102 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.06 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 26 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 nc75276741 Id of event.
Event Code 75276741 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,nc75276741, A comma-separated list of event ids that are associated to an event.

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