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Minor earthquake: M3.55 quake has struck near Brenas in Puerto Rico


Earthquake location 18.6661S, -66.3375WA minor earthquake magnitude 3.55 (ml/mb) has struck on Monday, 22 kilometers (14 miles) from Brenas in Puerto Rico. The epicenter of the earthquake was roughly 70 km (43 miles) below the earth’s surface. Exact location of earthquake, longitude -66.3375 West, latitude 18.6661 North, depth = 70 km. Unique identifier: pr2025356000. Ids that are associated to the event: us7000rk6n, pr2025356000. Exact time and date of event in UTC/GMT: 22/12/25 / 2025-12-22 19:56:50 / December 22, 2025 @ 7:56 pm. The temblor was reported at 19:56:50 / 7:56 pm (local time epicenter).

Close country/countries, Puerto Rico (c. 3 917 000 pop) (That might be effected). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Yabucoa, Punta Santiago, Arroyo. The epicenter was 33 km (21 miles) from San Juan (c. 418 100 pop), 35 km (22 miles) from Bayamón (c. 203 500 pop), 51 km (32 miles) from Carolina (c. 170 400 pop), 78 km (49 miles) from Ponce (c. 152 600 pop), 57 km (35 miles) from Caguas (c. 86 800 pop), 42 km (26 miles) from Guaynabo (c. 81 400 pop).

In the past 24 hours, there have been two, in the last 10 days nine, in the past 30 days thirty-six and in the last 365 days four hundred and four earthquakes of magnitude 3.0 or greater that have been detected nearby. Each year there are an estimated 130,000 minor earthquakes in the world. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage.

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. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 22 km N of Brenas, Puerto Rico.

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More information

Parameter Value Description
Magnitude 3.55 mb The magnitude for the event.
Longitude -66.3375° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 18.6661° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 70 km Depth of the event in kilometers.
Place 22 km N of Brenas, 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 2025-12-22 19:56:50 Time when the event occurred. UTC/GMT
Updated 2025-12-22 20:20:13 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 2 The maximum reported intensity for the event.
MMI 2.251 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 194 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 0.2694 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.18 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 207 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 pr2025356000 Id of event.
Event Code 2025356000 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000rk6n,pr2025356000, A comma-separated list of event ids that are associated to an event.

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