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Light earthquake, 4 mag strikes near Adak in Alaska

Posted by admin on March 22, 2025 0 Comments

Earthquake location 51.0515S, -176.0577WA light earthquake magnitude 4 (ml/mb) has occurred on Friday, 99 km SSE of Adak, Alaska (62 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of earthquake 21/03/25 / 2025-03-21 16:03:51 / March 21, 2025 @ 4:03 pm UTC/GMT. Exact location, longitude -176.0577° West, latitude 51.0515° North, depth = 35 km. Unique identifier: us7000plqb. Ids that are associated to the event: ak0253okjgcw, us7000plqb. The earthquake was roughly at a depth of 35 km (22 miles). The temblor was detected at 16:03:51 / 4:03 pm (local time epicenter).

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

How would you describe the shaking?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. 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: 99 km SSE of Adak, Alaska.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude -176.0577° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.0515° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 99 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 16:03:51 Time when the event occurred. UTC/GMT
Updated 2025-03-22 13:18:04 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 1.451 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 20 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.84 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.46 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 241 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 us7000plqb Id of event.
Event Code 7000plqb An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ak0253okjgcw,us7000plqb, A comma-separated list of event ids that are associated to an event.

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