Moderate earthquake, 5.5 mag was detected near Adak in Alaska

A moderate earthquake magnitude 5.5 (ml/mb) has struck on Thursday, 235 km W of Adak, Alaska (146 miles). Unique identifier: at00t1pax1. Ids that are associated to the event: at00t1pax1. Exact location of earthquake, longitude 179.944 East, latitude 51.918 North, depth = 121 km. Global time and date of event 28/08/25 / 2025-08-28 11:07:49 / August 28, 2025 @ 11:07 am UTC/GMT. The temblor was detected at 11:07:49 / 11:07 am (local time epicenter). The epicenter was at a depth of 121 km (75 miles). A tsunami warning has been issued near Adak in Alaska (Does not indicate if a tsunami actually did or will exist).

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 two, in the past 30 days two and in the last 365 days eighty-five earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures.

Did you feel it?

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. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 235 km W of Adak, Alaska.

Adak Alaska

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Parameter	Value	Description
Magnitude	5.5 mb	The magnitude for the event.
Longitude	179.944° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.918° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	121 km	Depth of the event in kilometers.
Place	235 km W 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	2025-08-28 11:07:49	Time when the event occurred. UTC/GMT
Updated	2025-08-28 11:11:17	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	19	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1958327	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.28 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	129.599989632	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	Mi	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	at00t1pax1	Id of event.
Event Code	00t1pax1	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,at00t1pax1,	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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