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M2.9 earthquake 5 km SW of Guánica, Puerto Rico

A magnitude 2.9 earthquake struck 5 km SW of Guánica, Puerto Rico at 09:35 local time (13:35 UTC) on 18 Sept 2026, at a depth of 10 km, according to USGS.

1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-18 15:49 UTC · reviewed

Magnitude
2.9micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-18 13:35:27 UTC
Local: 18 Sept 2026, 09:35:27 (America/Puerto Rico)
Epicentre
17.937° N, 66.935° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
GuánicaPuerto Rico · pop. 9,2245 kmIIIWeak
YaucoPuerto Rico · pop. 20,29514 kmIIWeak
PoncePuerto Rico · pop. 137,49134 kmINot felt
MayagüezPuerto Rico · pop. 73,07736 kmINot felt
AreciboPuerto Rico · pop. 87,75463 kmINot felt
San JuanPuerto Rico · pop. 418,140105 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000314 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941318 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 10 km.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.9 ml10 km17.94° N, 66.94° W–Reviewed

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How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 338 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.9 releases about 32× the energy of M1.9, and its waves are about 10× taller on a seismogram. Energy: 338 kg of TNT vs 11 kg of TNT.

Each square is the energy of one M1.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

57 later earthquakes within 30 km; the largest was M3.4 10 days ago. 8 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

57 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.552.68
0.642.59
3.362.68
3.372.78
3.753.46
4.802.88
4.822.56
5.822.76
5.883.07
8.102.58
8.672.57
8.882.67
13.612.59
13.642.513
13.972.57
15.233.07
15.523.18
15.933.18
26.932.88
33.192.69
34.642.57
54.953.08
58.052.57
82.922.111
83.462.215
87.502.017
96.161.811
97.142.17
98.171.87
101.762.28
107.472.18
109.642.27
111.342.117
112.672.57
123.431.78
124.682.314
127.262.18
127.342.37
129.692.08
133.931.99
149.682.112
151.772.68
152.682.46
154.712.37
164.692.09
167.432.17
190.912.49
196.092.18
205.982.16
208.501.27
208.512.08
208.521.27
208.832.37
229.791.77
234.042.27
243.542.017
249.742.37
  1. 3.45 km W of Guánica, Puerto Rico09-18 17:20
  2. 3.15 km SW of Guánica, Puerto Rico09-19 05:06
  3. 3.15 km W of Guánica, Puerto Rico09-19 05:31
  4. 3.05 km WSW of Guánica, Puerto Rico09-18 19:28
  5. 3.04 km SW of Guánica, Puerto Rico09-19 04:49
  6. 3.05 km WSW of Guánica, Puerto Rico09-20 20:32
  7. 2.84 km WSW of Guánica, Puerto Rico09-18 18:23
  8. 2.8Near Guánica, Puerto Rico09-19 16:31
  9. 2.75 km W of Guánica, Puerto Rico09-18 19:24
  10. 2.76 km WSW of Guánica, Puerto Rico09-18 16:57
  11. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  12. 2.63 km SW of Guánica, Puerto Rico09-18 14:08
  13. 2.65 km SW of Guánica, Puerto Rico09-19 22:46
  14. 2.65 km WSW of Guánica, Puerto Rico09-18 22:28
  15. 2.64 km W of Guánica, Puerto Rico09-18 16:57
  16. 2.5Near Guánica, Puerto Rico09-18 21:41
  17. 2.5Near Guánica, Puerto Rico09-18 14:13
  18. 2.55 km SSW of Guánica, Puerto Rico09-18 18:24
  19. 2.54 km W of Guánica, Puerto Rico09-20 00:13
  20. 2.55 km SW of Guánica, Puerto Rico09-23 06:15
  21. 2.54 km W of Guánica, Puerto Rico09-20 23:38
  22. 2.54 km SSW of Guánica, Puerto Rico09-19 03:13
  23. 2.54 km SW of Guánica, Puerto Rico09-19 03:33
  24. 2.54 km SW of Guánica, Puerto Rico09-19 03:12
  25. 2.55 km SW of Guánica, Puerto Rico09-18 22:15

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id us7000tiav. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS (usgs:us7000tiav). Cite as: SeismoAtlas, “M2.9 earthquake 5 km SW of Guánica, Puerto Rico”, https://seismoatlas.com/earthquake/us7000tiav-m2-9-earthquake-5-km-sw-of-guanica-puerto-rico, data from USGS.

JSON: /api/v1/events/us7000tiav. SeismoAtlas is not an official warning service.