Light earthquake: M4.03 quake has struck near Petrolia in CA

A light earthquake magnitude 4.03 (ml/mb) strikes 54 kilometers (34 miles) from Petrolia in CA on Tuesday. Exact location of event, longitude -124.91983032227 West, latitude 40.346668243408 North, depth = 1.960000038147 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The epicenter was at a depth of 1.960000038147 km (1 miles). Event id: nc75235672. Ids that are associated to the earthquake: ew1757446870, nc75235672. Global time and date of event 09/09/25 / 2025-09-09 19:40:58 / September 9, 2025 @ 7:40 pm UTC/GMT. The temblor was picked up at 19:40:58 / 7:40 pm (local time epicenter).

Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Eureka, Fortuna. Close country/countries that might be effected, United States (c. 310 233 000 pop). The epicenter was 81 km (51 miles) from Eureka (c. 27 200 pop), 70 km (44 miles) from Fortuna (c. 11 900 pop).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Each year there are an estimated 13,000 light quakes in the world. In the past 24 hours, there have been three, in the last 10 days seven, in the past 30 days ten and in the last 365 days three hundred and eight earthquakes of magnitude 3.0 or greater that have been detected nearby.

Questions or comments?

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. 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: 54 km W of Petrolia, CA.

CA Eureka Fortuna Petrolia United States

More information

Parameter	Value	Description
Magnitude	4.03 mb	The magnitude for the event.
Longitude	-124.91983032227° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	40.346668243408° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	1.960000038147 km	Depth of the event in kilometers.
Place	54 km W of Petrolia, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-09-09 19:40:58	Time when the event occurred. UTC/GMT
Updated	2025-09-09 19:47:34	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	2.694	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	reviewed	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	251	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	,ew,nc,	A comma-separated list of network contributors.
Number of Stations Used	74	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.4452	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.32 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	242	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	nc75235672	Id of event.
Event Code	75235672	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ew1757446870,nc75235672,	A comma-separated list of event ids that are associated to an event.

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Light earthquake: M4.03 quake has struck near Petrolia in CA

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