Moderate earthquake, 5.3 mag strikes near Unalaska in Alaska

A moderate earthquake magnitude 5.3 (ml/mb) has occurred on Sunday, 29 km ESE of Unalaska, Alaska (18 miles). The temblor was picked up at 22:47:05 / 10:47 pm (local time epicenter). The earthquake was roughly at a depth of 75 km (47 miles). A tsunami warning has been issued near Unalaska in Alaska (Does not indicate if a tsunami actually did or will exist). All ids that are associated to the event: at00t02xyh, ak0259kd5t6d. Unique identifier: at00t02xyh. Exact location of event, longitude -166.137 West, latitude 53.745 North, depth = 75 km. Global time and date of event 27/07/25 / 2025-07-27 22:47:05 / July 27, 2025 @ 10:47 pm UTC/GMT.

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

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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. 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: 29 km ESE of Unalaska, Alaska.

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Parameter	Value	Description
Magnitude	5.3 mb	The magnitude for the event.
Longitude	-166.137° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	53.745° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	75 km	Depth of the event in kilometers.
Place	29 km ESE of Unalaska, Alaska	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-07-27 22:47:05	Time when the event occurred. UTC/GMT
Updated	2025-07-27 22:54:06	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	3	The total number of felt reports
CDI	4.8	The maximum reported intensity for the event.
MMI	3.786	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	434	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	at	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,at,ak,	A comma-separated list of network contributors.
Number of Stations Used	78	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.42 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	165.599986752	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	at00t02xyh	Id of event.
Event Code	00t02xyh	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,at00t02xyh,ak0259kd5t6d,	A comma-separated list of event ids that are associated to an event.

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Moderate earthquake, 5.3 mag strikes near Unalaska in Alaska

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