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Light earthquake, 4.1 mag strikes near Ontario in CA


Earthquake location 34.0251656S, -117.5916672WA light earthquake magnitude 4.1 (ml/mb) strikes 4 kilometers (2 miles) from Ontario in CA on Sunday. The 4.1-magnitude earthquake was detected at 10:51:08 / 10:51 am (local time epicenter). A tsunami warning has been issued near Ontario in CA (Does not indicate if a tsunami actually did or will exist). Exact location, longitude -117.5916672° West, latitude 34.0251656° North, depth = 5.74 km. The epicenter of the earthquake was roughly 5.74 km (4 miles) below the earth’s surface. Global time and date of event 06/10/24 / 2024-10-06 10:51:08 / October 6, 2024 @ 10:51 am UTC/GMT. Event id: ci40752807. Ids that are associated to the earthquake: ew1728211870, ci40752807, at00skxkt8.

Closest city/cities/towns to epicentrum/hypocenter was Camp Pendleton South, Lancaster, Northridge (min 5000 pop). Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). The epicenter was 60 km (37 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), 20 km (12 miles) from Riverside (c. 303 900 pop), 45 km (28 miles) from Irvine (c. 212 400 pop).

There are an estimated 13,000 light quakes in the world each year. In the past 24 hours, there have been one, in the last 10 days five, in the past 30 days fifteen and in the last 365 days thirty-three earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Questions or comments?

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 SE of Ontario, CA.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -117.5916672° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 34.0251656° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 5.74 km Depth of the event in kilometers.
Place 4 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 2024-10-06 10:51:08 Time when the event occurred. UTC/GMT
Updated 2024-10-06 10:54:57 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt 6 The total number of felt reports
CDI 3.4 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 1 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 261 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,at, A comma-separated list of network contributors.
Number of Stations Used 97 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.01526 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 46 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 ci40752807 Id of event.
Event Code 40752807 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ew1728211870,ci40752807,at00skxkt8, A comma-separated list of event ids that are associated to an event.

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