Minor earthquake, 3.9 mag was detected near Unalaska in Alaska

A minor earthquake with magnitude 3.9 (ml/mb) was detected on Friday, 6 km WSW of Unalaska, Alaska (4 miles). Event id: ak2025yxxvzo. Ids that are associated to the earthquake: av93956901, ak2025yxxvzo. The earthquake occurred at a depth of 6 km (4 miles) below the earth’s surface. The 3.9-magnitude earthquake was detected at 23:15:06 / 11:15 pm (local time epicenter). Date and time of earthquake in UTC/GMT: 19/12/25 / 2025-12-19 23:15:06 / December 19, 2025 @ 11:15 pm. Exact location of earthquake, -166.628° West, 53.858° North, depth 6 km.

Every 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 three, in the last 10 days three, in the past 30 days six and in the last 365 days eighty-eight earthquakes of magnitude 3.0 or greater that has occurred nearby.

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How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity 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: 6 km WSW of Unalaska, Alaska.

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Parameter	Value	Description
Magnitude	3.9 mb	The magnitude for the event.
Longitude	-166.628° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	53.858° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	6 km	Depth of the event in kilometers.
Place	6 km WSW of Unalaska, Alaska	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-12-19 23:15:06	Time when the event occurred. UTC/GMT
Updated	2025-12-20 13:41:52	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	4	The total number of felt reports
CDI	3.4	The maximum reported intensity for the event.
MMI	3.9	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	235	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	ak	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,av,ak,	A comma-separated list of network contributors.
Number of Stations Used	45	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.6 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	135	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	ak2025yxxvzo	Id of event.
Event Code	2025yxxvzo	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,av93956901,ak2025yxxvzo,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.9 mag was detected near Unalaska in Alaska

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