Minor earthquake, 3.91 mag strikes near Ontario in CA

A minor earthquake with magnitude 3.91 (ml/mb) was reported 5 kilometers (3 miles) from Ontario in CA on Saturday. The 3.91-magnitude earthquake has occurred at 17:34:20 / 5:34 pm (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, longitude -117.5859985 West, latitude 34.0296669 North, depth = 4.94 km. All ids that are associated to the event: ew1725730460, ci40727551, ci40727543. Unique identifier: ci40727543. The epicenter was at a depth of 4.94 km (3 miles). Date and time of earthquake in UTC/GMT: 07/09/24 / 2024-09-07 17:34:20 / September 7, 2024 @ 5:34 pm.

The epicenter was 61 km (38 miles) from Los Angeles (c. 3 792 600 pop), 63 km (39 miles) from Long Beach (c. 462 300 pop), 37 km (23 miles) from Anaheim (c. 336 300 pop), 41 km (25 miles) from Santa Ana (c. 324 500 pop), 19 km (12 miles) from Riverside (c. 303 900 pop), 46 km (28 miles) from Irvine (c. 212 400 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Santa Monica, Camp Pendleton North, San Fernando. Close country/countries that might be effected, United States (c. 310 233 000 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 two, in the last 10 days two, in the past 30 days seven and in the last 365 days twenty earthquakes of magnitude 3.0 or greater that was reported nearby.

Did you feel the quake?

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. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 5 km ESE of Ontario, CA. This information 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

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Parameter	Value	Description
Magnitude	3.91 mb	The magnitude for the event.
Longitude	-117.5859985° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	34.0296669° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	4.94 km	Depth of the event in kilometers.
Place	5 km ESE 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	2024-09-07 17:34:20	Time when the event occurred. UTC/GMT
Updated	2024-09-07 17:38:48	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	235	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	,ew,ci,ci,	A comma-separated list of network contributors.
Number of Stations Used	102	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.01804	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	51	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	ci40727543	Id of event.
Event Code	40727543	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ew1725730460,ci40727551,ci40727543,	A comma-separated list of event ids that are associated to an event.

Parameter

Value

Description

Magnitude

3.91 mb

The magnitude for the event.

Longitude

-117.5859985° West

Decimal degrees longitude. Negative values for western longitudes.

Latitude

34.0296669° North

Decimal degrees latitude. Negative values for southern latitudes.

Depth

4.94 km

Depth of the event in kilometers.

Place

5 km ESE 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

2024-09-07 17:34:20

Time when the event occurred. UTC/GMT

Updated

2024-09-07 17:38:48

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

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

235

A number describing how significant the event is. Larger numbers indicate a more significant event.

Network

The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.

Sources

,ew,ci,ci,

A comma-separated list of network contributors.

Number of Stations Used

102

The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.

Horizontal Distance

0.01804

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

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

ci40727543

Id of event.

Event Code

40727543

An identifying code assigned by, and unique from, the corresponding source for the event.

Event IDS

,ew1725730460,ci40727551,ci40727543,

A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.91 mag strikes near Ontario in CA

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