Minor earthquake, 3.4 mag has occurred near Unalaska in Alaska

A minor earthquake magnitude 3.4 (ml/mb) strikes 38 km S of Unalaska, Alaska (24 miles) on Tuesday. The epicenter was at a depth of 68.764 km (43 miles). The 3.4-magnitude earthquake was detected at 04:29:20 / 4:29 am (local time epicenter). Global date and time of event UTC/GMT: 12/08/25 / 2025-08-12 04:29:20 / August 12, 2025 @ 4:29 am. Exact location of earthquake, -166.5311° West, 53.5277° North, depth 68.764 km. Event id: us6000r017. Ids that are associated to the earthquake: ak025aaixqh8, us6000r017.

In the past 24 hours, there have been six, in the last 10 days six, in the past 30 days twelve and in the last 365 days one hundred and thirty-four earthquakes of magnitude 3.0 or greater that have been detected nearby. Every year there are an estimated 130,000 minor earthquakes in the world. Earthquakes 2.5 to 3.5 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 data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 38 km S of Unalaska, Alaska.

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Parameter	Value	Description
Magnitude	3.4 mb	The magnitude for the event.
Longitude	-166.5311° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	53.5277° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	68.764 km	Depth of the event in kilometers.
Place	38 km S 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	2025-08-12 04:29:20	Time when the event occurred. UTC/GMT
Updated	2025-09-09 01:43:14	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	3.293	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	178	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	,ak,us,	A comma-separated list of network contributors.
Number of Stations Used	19	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.31	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.21 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	191	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	us6000r017	Id of event.
Event Code	6000r017	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ak025aaixqh8,us6000r017,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.4 mag has occurred near Unalaska in Alaska

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