Light earthquake, 4.8 mag has occurred near Adak in Alaska

A light earthquake magnitude 4.8 (ml/mb) has struck on Thursday, 87 km SSE of Adak, Alaska (54 miles). Global date and time of event UTC/GMT: 20/03/25 / 2025-03-20 10:21:04 / March 20, 2025 @ 10:21 am. The epicenter of the earthquake was roughly 16.8 km (10 miles) below the earth’s surface. The 4.8-magnitude earthquake was detected at 10:21:04 / 10:21 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). All ids that are associated to the event: ak0253mtj9bl. Unique identifier: ak0253mtj9bl. Exact location of earthquake, longitude -176.1465 West, latitude 51.1493 North, depth = 16.8 km.

In the past 24 hours, there have been six, in the last 10 days nine, in the past 30 days thirteen and in the last 365 days three hundred and thirty-seven earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Every year there are an estimated 13,000 light earthquakes in the world.

Questions or comments?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home 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: 87 km SSE of Adak, Alaska.

Adak Alaska

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Parameter	Value	Description
Magnitude	4.8 mb	The magnitude for the event.
Longitude	-176.1465° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.1493° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	16.8 km	Depth of the event in kilometers.
Place	87 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	2025-03-20 10:21:04	Time when the event occurred. UTC/GMT
Updated	2025-03-20 10:34:30	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	3.184	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	354	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	,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	0.53 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	ak0253mtj9bl	Id of event.
Event Code	0253mtj9bl	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ak0253mtj9bl,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.8 mag has occurred near Adak in Alaska

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