Minor earthquake, 3.66 mag has occurred near Petrolia in CA

A minor earthquake magnitude 3.66 (ml/mb) strikes 44 kilometers (27 miles) from Petrolia in CA on Friday. The earthquake occurred at a depth of 14.85000038147 km (9 miles). The temblor was detected at 07:03:12 / 7:03 am (local time epicenter). Exact location of earthquake, longitude -124.80216979981 West, latitude 40.330501556396 North, depth = 14.85000038147 km. Exact time and date of earthquake 22/08/25 / 2025-08-22 07:03:12 / August 22, 2025 @ 7:03 am UTC/GMT. Unique identifier: nc75227052. Ids that are associated to the event: nc75227052.

Nearest cities/city/villages to epicentrum/hypocenter was Arcata, Bayside, Eureka (min 5000 pop). Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). Event epicenter was 75 km (47 miles) from Eureka (c. 27 200 pop), 85 km (53 miles) from Arcata (c. 17 200 pop), 84 km (52 miles) from Bayside (c. 17 100 pop), 62 km (39 miles) from Fortuna (c. 11 900 pop).

Each year there are an estimated 130,000 minor quakes 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 two, in the past 30 days seven and in the last 365 days three hundred earthquakes of magnitude 3.0 or greater that have been detected in the same area.

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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. 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: 44 km WNW of Petrolia, CA.

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Parameter	Value	Description
Magnitude	3.66 mb	The magnitude for the event.
Longitude	-124.80216979981° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	40.330501556396° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	14.85000038147 km	Depth of the event in kilometers.
Place	44 km WNW 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	2025-08-22 07:03:12	Time when the event occurred. UTC/GMT
Updated	2025-08-22 07:05:17	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	206	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	37	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.3539	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.16 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	254	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	nc75227052	Id of event.
Event Code	75227052	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75227052,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.66 mag has occurred near Petrolia in CA

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