Moderate earthquake, 5.5 mag was detected near Adak in Alaska

A moderate earthquake magnitude 5.5 (ml/mb) has occurred on Sunday, 118 km WSW of Adak, Alaska (73 miles). Unique identifier: at00t2xmeu. Ids that are associated to the event: at00t2xmeu. Exact location of event, longitude -178.1339 West, latitude 51.359 North, depth = 35 km. Date and time of earthquake in UTC/GMT: 21/09/25 / 2025-09-21 09:30:30 / September 21, 2025 @ 9:30 am. A tsunami warning has been issued near Adak in Alaska (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 35 km (22 miles) below the earth’s surface. The 5.5-magnitude earthquake has occurred at 09:30:30 / 9:30 am (local time epicenter).

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

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Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 118 km WSW of Adak, Alaska. This information comes from the USGS Earthquake Notification Service.

Adak Alaska

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Parameter	Value	Description
Magnitude	5.5 mb	The magnitude for the event.
Longitude	-178.1339° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.359° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	35 km	Depth of the event in kilometers.
Place	118 km WSW 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 09:30:30	Time when the event occurred. UTC/GMT
Updated	2025-09-21 09:36:12	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	465	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	at	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,at,	A comma-separated list of network contributors.
Number of Stations Used	34	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.5479723	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.12 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	201.599983872	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	at00t2xmeu	Id of event.
Event Code	00t2xmeu	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,at00t2xmeu,	A comma-separated list of event ids that are associated to an event.

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Moderate earthquake, 5.5 mag was detected near Adak in Alaska

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