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Moderate earthquake: M5.5 quake has struck near Adak in Alaska

Posted by admin on August 29, 2025 0 Comments

Earthquake location 51.6321S, 179.558WA moderate earthquake with magnitude 5.5 (ml/mb) was reported 264 km W of Adak, Alaska (164 miles) on Friday. Exact location of event, depth 83.028 km, 179.558° East, 51.6321° North. The epicenter was at a depth of 83.028 km (52 miles). A tsunami warning has been issued near Adak in Alaska (Does not indicate if a tsunami actually did or will exist). The temblor was reported at 09:14:25 / 9:14 am (local time epicenter). All ids that are associated to the event: at00t1r0c2, ak025b2pylgm, us7000qru7. Unique identifier: us7000qru7. Exact time and date of earthquake 29/08/25 / 2025-08-29 09:14:25 / August 29, 2025 @ 9:14 am UTC/GMT.

In the past 24 hours, there have been five, in the last 10 days six, in the past 30 days six and in the last 365 days one hundred and four earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures. Every year there are an estimated 1320 moderate earthquakes in the world.

How would you describe the shaking?

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. 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: 264 km W of Adak, Alaska.

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More information

Parameter Value Description
Magnitude 5.5 mb The magnitude for the event.
Longitude 179.558° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 51.6321° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 83.028 km Depth of the event in kilometers.
Place 264 km W 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 2025-08-29 09:14:25 Time when the event occurred. UTC/GMT
Updated 2025-08-29 09:33:13 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 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 465 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,ak,us, A comma-separated list of network contributors.
Number of Stations Used 103 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.268 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.57 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 118 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 us7000qru7 Id of event.
Event Code 7000qru7 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00t1r0c2,ak025b2pylgm,us7000qru7, A comma-separated list of event ids that are associated to an event.

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