Minor earthquake, 3.38 mag was detected near Petrolia in CA

A minor earthquake with magnitude 3.38 (ml/mb) was detected on Friday, 40 kilometers (25 miles) from Petrolia in CA. Date and time of earthquake in UTC/GMT: 20/06/25 / 2025-06-20 07:49:44 / June 20, 2025 @ 7:49 am. The earthquake occurred at a depth of 16.760000228882 km (10 miles). All ids that are associated to the event: nc75197966. Unique identifier: nc75197966. The temblor was reported at 07:49:44 / 7:49 am (local time epicenter). Exact location of event, depth 16.760000228882 km, -124.75133514404° West, 40.352500915527° North.

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Arcata, Bayside, Eureka. Event epicenter was 70 km (44 miles) from Eureka (c. 27 200 pop), 80 km (50 miles) from Arcata (c. 17 200 pop), 80 km (49 miles) from Bayside (c. 17 100 pop), 57 km (36 miles) from Fortuna (c. 11 900 pop). Country/countries that might be effected, United States (c. 310 233 000 pop).

Each 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 one, in the last 10 days two, in the past 30 days twelve and in the last 365 days two hundred and seventy-nine earthquakes of magnitude 3.0 or greater that has occurred nearby.

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 40 km WNW of Petrolia, CA. This data comes from the USGS Earthquake Notification Service.

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Parameter	Value	Description
Magnitude	3.38 mb	The magnitude for the event.
Longitude	-124.75133514404° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	40.352500915527° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	16.760000228882 km	Depth of the event in kilometers.
Place	40 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	2025-06-20 07:49:44	Time when the event occurred. UTC/GMT
Updated	2025-06-20 07:51:47	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	176	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	50	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.319	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.22 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	236	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	nc75197966	Id of event.
Event Code	75197966	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75197966,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.38 mag was detected near Petrolia in CA

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