Minor earthquake, 3.54 mag was detected near Ontario in CA

A minor earthquake magnitude 3.54 (ml/mb) has struck on Wednesday, 5 kilometers (3 miles) from Ontario in CA. The temblor was reported at 08:02:55 / 8:02 am (local time epicenter). The earthquake was roughly at a depth of 6.51 km (4 miles). Exact time and date of event in UTC/GMT: 06/08/25 / 2025-08-06 08:02:55 / August 6, 2025 @ 8:02 am. Exact location of event, longitude -117.5886688 West, latitude 34.0218315 North, depth = 6.51 km. Id of earthquake: ci41254384. Event ids that are associated: ci41254384.

Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). Event epicenter was 60 km (38 miles) from Los Angeles (c. 3 792 600 pop), 62 km (39 miles) from Long Beach (c. 462 300 pop), 37 km (23 miles) from Anaheim (c. 336 300 pop), 40 km (25 miles) from Santa Ana (c. 324 500 pop), 19 km (12 miles) from Riverside (c. 303 900 pop), 45 km (28 miles) from Irvine (c. 212 400 pop). Nearest cities/city/towns to hypocenter/epicentrum was San Fernando, Santa Monica, Camp Pendleton North (min 5000 pop).

In the past 24 hours, there have been four, in the last 10 days ten, in the past 30 days twelve and in the last 365 days fifty 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 Ontario, CA. This data comes from the USGS Earthquake Notification Service.

Anaheim CA Camp Pendleton North Irvine Long Beach Los Angeles Ontario Riverside San Fernando Santa Ana Santa Monica United States

More information

Parameter	Value	Description
Magnitude	3.54 mb	The magnitude for the event.
Longitude	-117.5886688° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	34.0218315° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	6.51 km	Depth of the event in kilometers.
Place	5 km SE of Ontario, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-08-06 08:02:55	Time when the event occurred. UTC/GMT
Updated	2025-08-06 08:05:30	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	193	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	ci	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,ci,	A comma-separated list of network contributors.
Number of Stations Used	110	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.02829	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.25 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	20	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	mlr	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	ci41254384	Id of event.
Event Code	41254384	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ci41254384,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.54 mag was detected near Ontario in CA

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