Minor earthquake: M3.46 quake has struck near San Antonio in Puerto Rico

A minor earthquake with magnitude 3.46 (ml/mb) was reported 42 kilometers (26 miles) from San Antonio in Puerto Rico on Sunday. The temblor was reported at 19:23:58 / 7:23 pm (local time epicenter). All ids that are associated to the event: us7000rl8b, pr2025362001. Unique identifier: pr2025362001. The epicenter of the earthquake was roughly 8 km (5 miles) below the earth’s surface. Exact location of event, depth 8 km, -67.3756° West, 18.7675° North. Exact time and date of event in UTC/GMT: 28/12/25 / 2025-12-28 19:23:58 / December 28, 2025 @ 7:23 pm.

The epicenter was 68 km (42 miles) from Mayagüez (c. 78 600 pop), 77 km (48 miles) from Arecibo (c. 49 300 pop), 44 km (28 miles) from Aguadilla (c. 16 100 pop), 47 km (29 miles) from Isabela (c. 12 500 pop), 75 km (46 miles) from Hormigueros (c. 11 900 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Puerto Real, Cabo Rojo, Maricao. Country/countries that might be effected, Puerto Rico (c. 3 917 000 pop).

In the past 24 hours, there have been three, in the last 10 days eleven, in the past 30 days thirty-seven and in the last 365 days five hundred and twenty-five earthquakes of magnitude 3.0 or greater that has occurred nearby. Each year there are an estimated 130,000 minor quakes in the world. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage.

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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. 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: 42 km NW of San Antonio, Puerto Rico.

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Parameter	Value	Description
Magnitude	3.46 mb	The magnitude for the event.
Longitude	-67.3756° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	18.7675° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	8 km	Depth of the event in kilometers.
Place	42 km NW of San Antonio, Puerto Rico	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-12-28 19:23:58	Time when the event occurred. UTC/GMT
Updated	2025-12-28 20:00:55	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	184	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	pr	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,us,pr,	A comma-separated list of network contributors.
Number of Stations Used	23	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.3999	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.19 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	188	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	md	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	pr2025362001	Id of event.
Event Code	2025362001	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000rl8b,pr2025362001,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake: M3.46 quake has struck near San Antonio in Puerto Rico

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