Light earthquake, 4.2 mag strikes near Neiafu in Tonga

A light earthquake magnitude 4.2 (ml/mb) strikes 77 kilometers (48 miles) from Neiafu in Tonga on Thursday. Exact location of earthquake, longitude -173.3525 West, latitude -18.2901 South, depth = 120.495 km. The temblor was reported at 13:01:48 / 1:01 pm (local time epicenter). The earthquake occurred at a depth of 120.495 km (75 miles) below the earth’s surface. Unique identifier: us6000rn00. Ids that are associated to the event: us6000rn00. Exact time and date of event in UTC/GMT: 23/10/25 / 2025-10-23 13:01:48 / October 23, 2025 @ 1:01 pm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Epicenter of the event was 78 km (48 miles) from Neiafu (c. 4 300 pop). Close country/countries, Tonga (c. 123 000 pop) (That might be effected). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Neiafu.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days fifteen earthquakes of magnitude 3.0 or greater that have been detected in the same area. There are an estimated 13,000 light earthquakes in the world each year.

Questions or comments?

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: 77 km ENE of Neiafu, Tonga.

Neiafu Tonga

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Parameter	Value	Description
Magnitude	4.2 mb	The magnitude for the event.
Longitude	-173.3525° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-18.2901° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	120.495 km	Depth of the event in kilometers.
Place	77 km ENE of Neiafu, Tonga	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-10-23 13:01:48	Time when the event occurred. UTC/GMT
Updated	2025-11-13 16:18:22	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	20	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	3.34	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.47 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	96	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	us6000rn00	Id of event.
Event Code	6000rn00	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000rn00,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.2 mag strikes near Neiafu in Tonga

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