Light earthquake 4 mag, 77 km SSE of Adak, Alaska

A light earthquake with magnitude 4 (ml/mb) was reported 77 km SSE of Adak, Alaska (48 miles) on Thursday. The 4-magnitude earthquake was detected at 06:50:30 / 6:50 am (local time epicenter). The earthquake occurred at a depth of 35 km (22 miles). Event id: us6000pzzp. Ids that are associated to the earthquake: ak0253mrbsuh, us6000pzzp. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Global date and time of event UTC/GMT: 20/03/25 / 2025-03-20 06:50:30 / March 20, 2025 @ 6:50 am. Exact location of event, depth 35 km, -176.2208° West, 51.2224° North.

In the past 24 hours, there have been fourteen, in the last 10 days fifteen, in the past 30 days twenty and in the last 365 days three hundred and fourty-five earthquakes of magnitude 3.0 or greater that have been detected in the same area. Every year there are an estimated 13,000 light earthquakes in the world. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

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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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 77 km SSE of Adak, Alaska. This data comes from the USGS Earthquake Notification Service.

Adak Alaska

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Parameter	Value	Description
Magnitude	4 mb	The magnitude for the event.
Longitude	-176.2208° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	51.2224° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	35 km	Depth of the event in kilometers.
Place	77 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 06:50:30	Time when the event occurred. UTC/GMT
Updated	2025-03-20 12:24:24	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	1.868	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	246	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	37	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.651	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.54 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	208	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	us6000pzzp	Id of event.
Event Code	6000pzzp	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,ak0253mrbsuh,us6000pzzp,	A comma-separated list of event ids that are associated to an event.

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Light earthquake 4 mag, 77 km SSE of Adak, Alaska

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