Minor earthquake: M3.56 quake has struck near Willow Creek in CA

A minor earthquake with magnitude 3.56 (ml/mb) was reported 10 kilometers (6 miles) from Willow Creek in CA on Tuesday. The temblor was detected at 16:45:10 / 4:45 pm (local time epicenter). Date and time of earthquake in UTC/GMT: 09/09/25 / 2025-09-09 16:45:10 / September 9, 2025 @ 4:45 pm. All ids that are associated to the event: nc75235587. Unique identifier: nc75235587. Exact location of event, depth 28.940000534058 km, -123.51750183106° West, 40.917835235596° North. The earthquake was roughly at a depth of 28.940000534058 km (18 miles).

Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Fortuna, Eureka, McKinleyville. Country/countries that might be effected, United States (c. 310 233 000 pop). Epicenter of the earthquake was 56 km (35 miles) from Eureka (c. 27 200 pop), 48 km (30 miles) from Arcata (c. 17 200 pop), 47 km (29 miles) from Bayside (c. 17 100 pop), 49 km (31 miles) from McKinleyville (c. 15 200 pop), 65 km (40 miles) from Fortuna (c. 11 900 pop).

There are an estimated 130,000 minor quakes in the world each year. 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 two and in the last 365 days sixty-nine earthquakes of magnitude 3.0 or greater that has occurred nearby.

Did you feel anything?

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 information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 10 km ESE of Willow Creek, CA.

More information

Parameter	Value	Description
Magnitude	3.56 mb	The magnitude for the event.
Longitude	-123.51750183106° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	40.917835235596° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	28.940000534058 km	Depth of the event in kilometers.
Place	10 km ESE of Willow Creek, 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 16:45:10	Time when the event occurred. UTC/GMT
Updated	2025-09-09 16:54:19	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	2	The total number of felt reports
CDI	3.1	The maximum reported intensity for the event.
MMI	2.566	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	196	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	,nc,	A comma-separated list of network contributors.
Number of Stations Used	62	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1219	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.15 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	44	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	nc75235587	Id of event.
Event Code	75235587	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75235587,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake: M3.56 quake has struck near Willow Creek in CA

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