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Minor earthquake 3.46 mag, 5 km SW of Ridgemark, CA

Posted by admin on December 21, 2025 0 Comments

Earthquake location 36.786167144775S, -121.40983581543WA minor earthquake magnitude 3.46 (ml/mb) strikes 5 kilometers (3 miles) from Ridgemark in CA on Sunday. Global date and time of event UTC/GMT: 21/12/25 / 2025-12-21 20:40:49 / December 21, 2025 @ 8:40 pm. All ids that are associated to the event: nc75284286. Unique identifier: nc75284286. The earthquake occurred at a depth of 7.1900000572205 km (4 miles). Exact location of event, depth 7.1900000572205 km, -121.40983581543° West, 36.786167144775° North. The temblor was detected at 20:40:49 / 8:40 pm (local time epicenter).

Epicenter of the earthquake was 75 km (47 miles) from San Jose (c. 945 900 pop), 25 km (16 miles) from Salinas (c. 150 400 pop), 80 km (49 miles) from Santa Clara (c. 116 500 pop), 59 km (37 miles) from Santa Cruz (c. 59 900 pop), 81 km (51 miles) from Cupertino (c. 58 300 pop). Closest city/cities/towns to epicentrum/hypocenter was Cupertino, Patterson, Santa Clara (min 5000 pop). 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. In the past 24 hours, there have been one, in the last 10 days three, in the past 30 days twelve and in the last 365 days fifty-three earthquakes of magnitude 3.0 or greater that has struck near. Each year there are an estimated 130,000 minor quakes in the world.

Did you feel it?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking 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 SW of Ridgemark, CA.

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More information

Parameter Value Description
Magnitude 3.46 mb The magnitude for the event.
Longitude -121.40983581543° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 36.786167144775° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 7.1900000572205 km Depth of the event in kilometers.
Place 5 km SW of Ridgemark, 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 20:40:49 Time when the event occurred. UTC/GMT
Updated 2025-12-21 20:44:05 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 184 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 66 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.03727 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.11 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 38 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 nc75284286 Id of event.
Event Code 75284286 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,nc75284286, A comma-separated list of event ids that are associated to an event.

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