Minor earthquake, 3.8 mag strikes near Adak in Alaska

A minor earthquake with magnitude 3.8 (ml/mb) was reported 101 km SSE of Adak, Alaska (63 miles) on Friday. Exact location of event, longitude -176.1418 West, latitude 51.0171 North, depth = 30.158 km. Event id: us7000plqe. Ids that are associated to the earthquake: ak0253oltax8, us7000plqe. The 3.8-magnitude earthquake has occurred at 18:17:40 / 6:17 pm (local time epicenter). Exact time and date of earthquake 21/03/25 / 2025-03-21 18:17:40 / March 21, 2025 @ 6:17 pm UTC/GMT. The earthquake occurred at a depth of 30.158 km (19 miles).

In the past 24 hours, there have been twenty-two, in the last 10 days fourty-three, in the past 30 days fourty-seven and in the last 365 days three hundred and fifty-three earthquakes of magnitude 3.0 or greater that has struck near. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. There are an estimated 130,000 minor quakes in the world each year.

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 101 km SSE of Adak, Alaska.

Adak Alaska

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Parameter	Value	Description
Magnitude	3.8 mb	The magnitude for the event.
Longitude	-176.1418° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.0171° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	30.158 km	Depth of the event in kilometers.
Place	101 km SSE 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	2025-03-21 18:17:40	Time when the event occurred. UTC/GMT
Updated	2025-03-21 20:11:47	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	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	28	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.862	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.5 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	us7000plqe	Id of event.
Event Code	7000plqe	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ak0253oltax8,us7000plqe,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.8 mag strikes near Adak in Alaska

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