Minor earthquake, 3.8 mag has occurred near Adak in Alaska

A minor earthquake with magnitude 3.8 (ml/mb) was detected on Sunday, 45 km S of Adak, Alaska (28 miles). Exact time and date of event in UTC/GMT: 20/07/25 / 2025-07-20 21:37:50 / July 20, 2025 @ 9:37 pm. Exact location of event, longitude -176.7095 West, latitude 51.4673 North, depth = 41.612 km. The 3.8-magnitude earthquake was detected at 21:37:50 / 9:37 pm (local time epicenter). Event ids that are associated to the earthquake: ak02598rqvvs, us7000qe5e. Id of event: us7000qe5e. The earthquake was roughly at a depth of 41.612 km (26 miles).

Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. In the past 24 hours, there have been two, in the last 10 days five, in the past 30 days thirteen and in the last 365 days five hundred and fifty-seven earthquakes of magnitude 3.0 or greater that have been detected in the same area. Each year there are an estimated 130,000 minor quakes in the world.

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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: 45 km S of Adak, Alaska.

Adak Alaska

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Parameter	Value	Description
Magnitude	3.8 mb	The magnitude for the event.
Longitude	-176.7095° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.4673° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	41.612 km	Depth of the event in kilometers.
Place	45 km S 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	2025-07-20 21:37:50	Time when the event occurred. UTC/GMT
Updated	2025-07-21 05:19:21	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	1	The total number of felt reports
CDI	2	The maximum reported intensity for the event.
MMI	2.13	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	222	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	34	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.438	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.38 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	205	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	us7000qe5e	Id of event.
Event Code	7000qe5e	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ak02598rqvvs,us7000qe5e,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.8 mag has occurred near Adak in Alaska

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