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M2.2 earthquake 4 km SW of Guayanilla, Puerto Rico

A magnitude 2.2 earthquake struck 4 km SW of Guayanilla, Puerto Rico at 21:03 local time (01:03 UTC) on 21 Sept 2026, at a depth of 15 km, according to USGS.

Data: USGS · updated 2026-09-22 01:14 UTC · reviewed

Magnitude
2.2micro
duration magnitude (md)
Depth
14.8 km
Status
Reviewed
Origin time
2026-09-22 01:03:03 UTC
Local: 21 Sept 2026, 21:03:03 (America/Puerto Rico)
Epicentre
17.997° N, 66.819° 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
GuayanillaPuerto Rico · pop. 5,2134 kmINot felt
YaucoPuerto Rico · pop. 20,2955 kmINot felt
PoncePuerto Rico · pop. 137,49121 kmINot felt
MayagüezPuerto Rico · pop. 73,07741 kmINot felt
AreciboPuerto Rico · pop. 87,75454 kmINot felt
San JuanPuerto Rico · pop. 418,14091 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000325 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941329 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.

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 · PR, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · PRheadlinePuerto Rico Seismic Network via U.S. Geological Survey2.2 md14.8 km18.00° N, 66.82° 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 31 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 15 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.2 releases about 33× the energy of M1.2, and its waves are about 10× taller on a seismogram. Energy: 31 kg of TNT vs 951 g of TNT.

Each square is the energy of one M1.2. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

35 later earthquakes within 30 km; the largest was M2.6 4 days ago. 32 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.2

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.451.415
4.042.017
4.072.115
12.701.811
13.682.17
14.711.87
18.302.28
24.012.18
26.182.27
27.882.117
29.212.57
39.971.78
41.222.314
43.802.18
43.882.37
46.232.08
50.471.99
66.222.112
68.312.68
68.492.118
69.222.46
71.252.37
81.232.09
83.972.17
107.452.49
112.632.18
122.522.16
125.041.27
125.052.08
125.061.27
125.372.37
134.971.814
146.331.77
150.582.27
160.082.017
  1. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  2. 2.55 km SW of Guánica, Puerto Rico09-23 06:15
  3. 2.45 km WSW of Guánica, Puerto Rico09-24 22:16
  4. 2.44 km SE of Guánica, Puerto Rico09-26 12:30
  5. 2.3Near Guayanilla, Puerto Rico09-23 18:16
  6. 2.34 km W of Guánica, Puerto Rico09-25 00:18
  7. 2.34 km SW of Guánica, Puerto Rico09-23 20:55
  8. 2.35 km SW of Guánica, Puerto Rico09-27 06:25
  9. 2.23 km SW of Guánica, Puerto Rico09-22 19:20
  10. 2.24 km SW of Guánica, Puerto Rico09-23 03:13
  11. 2.2Near Guánica, Puerto Rico09-28 07:37
  12. 2.19 km SE of Ponce, Puerto Rico09-24 21:32
  13. 2.15 km W of Guánica, Puerto Rico09-22 14:44
  14. 2.13 km ESE of Yauco, Puerto Rico09-23 01:03
  15. 2.15 km ESE of Guayanilla, Puerto Rico09-23 04:55
  16. 2.15 km NNW of Guánica, Puerto Rico09-23 20:51
  17. 2.14 km WSW of Guánica, Puerto Rico09-25 13:01
  18. 2.13 km W of Guánica, Puerto Rico09-26 17:40
  19. 2.18 km SSE of Ponce, Puerto Rico09-22 05:07
  20. 2.16 km S of Yauco, Puerto Rico09-24 19:16
  21. 2.14 km WNW of Guánica, Puerto Rico09-27 03:34
  22. 2.05 km S of Yauco, Puerto Rico09-22 05:05
  23. 2.08 km SSW of Guánica, Puerto Rico09-27 06:06
  24. 2.03 km ESE of Yauco, Puerto Rico09-28 17:07
  25. 2.04 km WNW of Guánica, Puerto Rico09-23 23:16

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Reports on SeismoAtlas

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Event id pr71533968. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · PR (usgs:pr71533968). Cite as: SeismoAtlas, “M2.2 earthquake 4 km SW of Guayanilla, Puerto Rico”, https://seismoatlas.com/earthquake/pr71533968-m2-2-earthquake-4-km-sw-of-guayanilla-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71533968. SeismoAtlas is not an official warning service.