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Moderate earthquake, 5.5 mag strikes near Adak in Alaska

Posted by admin on September 21, 2025 0 Comments

Earthquake location 51.2146S, -178.0975WA moderate earthquake with magnitude 5.5 (ml/mb) was reported 125 km SW of Adak, Alaska (78 miles) on Sunday. Global time and date of event 21/09/25 / 2025-09-21 09:30:27 / September 21, 2025 @ 9:30 am UTC/GMT. Event id: us7000qxp1. Ids that are associated to the earthquake: at00t2xmeu, us7000qxp1, ak025c4rf0bd. Exact location of event, depth 24.684 km, -178.0975° West, 51.2146° North. The 5.5-magnitude earthquake was detected at 09:30:27 / 9:30 am (local time epicenter). A tsunami warning has been issued near Adak in Alaska (Does not indicate if a tsunami actually did or will exist). The epicenter was at a depth of 24.684 km (15 miles).

Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures. In the past 24 hours, there have been three, in the last 10 days five, in the past 30 days seven and in the last 365 days three hundred and ninety-four earthquakes of magnitude 3.0 or greater that has struck near. There are an estimated 1320 moderate earthquakes in the world each year.

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 data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 125 km SW of Adak, Alaska.

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More information

Parameter Value Description
Magnitude 5.5 mb The magnitude for the event.
Longitude -178.0975° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.2146° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 24.684 km Depth of the event in kilometers.
Place 125 km SW 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 2025-09-21 09:30:27 Time when the event occurred. UTC/GMT
Updated 2025-09-21 09:50:31 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 3.4 The maximum reported intensity for the event.
MMI 2.233 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 1 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 466 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 ,at,us,ak, A comma-separated list of network contributors.
Number of Stations Used 135 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.556 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.13 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 53 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mww The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us7000qxp1 Id of event.
Event Code 7000qxp1 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00t2xmeu,us7000qxp1,ak025c4rf0bd, A comma-separated list of event ids that are associated to an event.

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