Light earthquake 4.2 mag, 117 km SW of Nikolski, Alaska

A light earthquake with magnitude 4.2 (ml/mb) was reported 117 km SW of Nikolski, Alaska (73 miles) on Wednesday. The earthquake was roughly at a depth of 34.728 km (22 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Event ids that are associated to the earthquake: us7000qtlc. Id of event: us7000qtlc. Exact location, longitude -170.1127° West, latitude 52.2145° North, depth = 34.728 km. The temblor was detected at 20:07:42 / 8:07 pm (local time epicenter). Exact time and date of event in UTC/GMT: 03/09/25 / 2025-09-03 20:07:42 / September 3, 2025 @ 8:07 pm.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Each year there are an estimated 13,000 light quakes in the world. In the past 24 hours, there have been one, in the last 10 days four, in the past 30 days seven and in the last 365 days one hundred and seventy-eight earthquakes of magnitude 3.0 or greater that has struck near.

Did you feel it?

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: 117 km SW of Nikolski, Alaska.

Alaska Nikolski

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Parameter	Value	Description
Magnitude	4.2 mb	The magnitude for the event.
Longitude	-170.1127° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	52.2145° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	34.728 km	Depth of the event in kilometers.
Place	117 km SW of Nikolski, Alaska	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-09-03 20:07:42	Time when the event occurred. UTC/GMT
Updated	2025-09-03 20:50:27	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	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	271	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	,us,	A comma-separated list of network contributors.
Number of Stations Used	69	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	1.079	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.87 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	141	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	us7000qtlc	Id of event.
Event Code	7000qtlc	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000qtlc,	A comma-separated list of event ids that are associated to an event.

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Light earthquake 4.2 mag, 117 km SW of Nikolski, Alaska

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