Moderate earthquake, 5.6 mag has occurred near Adak in Alaska

A moderate earthquake with magnitude 5.6 (ml/mb) was reported 123 km SW of Adak, Alaska (76 miles) on Sunday. The epicenter was at a depth of 19.8 km (12 miles). The temblor was reported at 09:30:27 / 9:30 am (local time epicenter). A tsunami warning has been issued near Adak in Alaska (Does not indicate if a tsunami actually did or will exist). Exact time and date of event in UTC/GMT: 21/09/25 / 2025-09-21 09:30:27 / September 21, 2025 @ 9:30 am. Unique identifier: ak025c4rf0bd. Ids that are associated to the event: at00t2xmeu, ak025c4rf0bd. Exact location, longitude -178.0079° West, latitude 51.1736° North, depth = 19.8 km.

Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures. Each year there are an estimated 1320 moderate earthquakes in the world. In the past 24 hours, there have been two, in the last 10 days four, in the past 30 days six and in the last 365 days three hundred and ninety-six earthquakes of magnitude 3.0 or greater that have been detected in the same area.

How would you describe the shaking?

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: 123 km SW of Adak, Alaska.

Adak Alaska

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Parameter	Value	Description
Magnitude	5.6 mb	The magnitude for the event.
Longitude	-178.0079° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.1736° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	19.8 km	Depth of the event in kilometers.
Place	123 km SW of Adak, Alaska	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-09-21 09:30:27	Time when the event occurred. UTC/GMT
Updated	2025-09-21 09:43:11	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	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	1	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	482	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	,at,ak,	A comma-separated list of network contributors.
Number of Stations Used		The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance		Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.57 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap		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	ak025c4rf0bd	Id of event.
Event Code	025c4rf0bd	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,at00t2xmeu,ak025c4rf0bd,	A comma-separated list of event ids that are associated to an event.

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Moderate earthquake, 5.6 mag has occurred near Adak in Alaska

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