Minor earthquake, 3.9 mag strikes near Unalaska in Alaska

A minor earthquake with magnitude 3.9 (ml/mb) was detected on Saturday, 84 km SSW of Unalaska, Alaska (52 miles). The earthquake was roughly at a depth of 48.35 km (30 miles). The temblor was detected at 09:33:18 / 9:33 am (local time epicenter). Global time and date of event 31/05/25 / 2025-05-31 09:33:18 / May 31, 2025 @ 9:33 am UTC/GMT. Unique identifier: us6000qh23. Ids that are associated to the event: us6000qh23, ak0256xvpf49. Exact location of earthquake, longitude -167.0036 West, latitude 53.1641 North, depth = 48.35 km.

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 one hundred and eighteen earthquakes of magnitude 3.0 or greater that was reported nearby. 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.

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What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 84 km SSW of Unalaska, Alaska.

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Parameter	Value	Description
Magnitude	3.9 mb	The magnitude for the event.
Longitude	-167.0036° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	53.1641° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	48.35 km	Depth of the event in kilometers.
Place	84 km SSW 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	2025-05-31 09:33:18	Time when the event occurred. UTC/GMT
Updated	2025-05-31 10:16:38	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	2.885	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	234	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	us	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,us,ak,	A comma-separated list of network contributors.
Number of Stations Used	33	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.598	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.84 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	169	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	mb	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	us6000qh23	Id of event.
Event Code	6000qh23	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000qh23,ak0256xvpf49,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.9 mag strikes near Unalaska in Alaska

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