Minor earthquake, 2.97 mag strikes near Rialto in CA

A minor earthquake with magnitude 2.97 (ml/mb) was reported 6 kilometers (4 miles) from Rialto in CA on Thursday. Global date and time of event UTC/GMT: 31/07/25 / 2025-07-31 15:34:38 / July 31, 2025 @ 3:34 pm. Exact location, longitude -117.4185028° West, latitude 34.1431656° North, depth = 5.83 km. Event ids that are associated to the earthquake: ci41249424. Id of event: ci41249424. The epicenter was at a depth of 5.83 km (4 miles). The 2.97-magnitude earthquake has occurred at 15:34:38 / 3:34 pm (local time epicenter).

Close country/countries, United States (c. 310 233 000 pop) (That might be effected). Closest city/cities/towns to epicentrum/hypocenter was Signal Hill, Florence-Graham, North Glendale (min 5000 pop). The epicenter was 77 km (48 miles) from Los Angeles (c. 3 792 600 pop), 57 km (35 miles) from Anaheim (c. 336 300 pop), 61 km (38 miles) from Santa Ana (c. 324 500 pop), 21 km (13 miles) from Riverside (c. 303 900 pop), 65 km (40 miles) from Irvine (c. 212 400 pop).

Every year there are an estimated 130,000 minor earthquakes in the world. 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 five, in the past 30 days five and in the last 365 days thirty-seven earthquakes of magnitude 3.0 or greater that have been detected in the same area.

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. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 6 km NW of Rialto, CA.

Anaheim CA Florence-Graham Irvine Los Angeles North Glendale Rialto Riverside Santa Ana Signal Hill United States

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Parameter	Value	Description
Magnitude	2.97 mb	The magnitude for the event.
Longitude	-117.4185028° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	34.1431656° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	5.83 km	Depth of the event in kilometers.
Place	6 km NW of Rialto, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-07-31 15:34:38	Time when the event occurred. UTC/GMT
Updated	2025-07-31 15:38:45	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	3	The total number of felt reports
CDI	2.7	The maximum reported intensity for the event.
MMI	2.651	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	137	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	122	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.04662	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.2 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	16	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	ci41249424	Id of event.
Event Code	41249424	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ci41249424,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 2.97 mag strikes near Rialto in CA

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