QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Guaynabo, PR

No earthquake was likely felt in Guaynabo in the 24 hours to 10:15 am AST (14:15 UTC). The last one was M 4.1, 93 km (58 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Guaynabo

This page: a magnitude 2.7 earthquake was recorded 6 km (4 mi) southwest of Guaynabo, PR, at 1:29 pm AST on 7 August 2026 (17:29 UTC), 58 km deep.

USGS: 5 km SW of Guaynabo, Puerto Rico

6 km (4 mi) S of Bayamón, PR

1:29 pm AST, Aug 7, 2026 · · 58 km deep · released about 360 lb of TNT

Every earthquake near Guaynabo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bayamón Municipio 3 kmGuaynabo Municipio 5 kmAguas Buenas Municipio 8 kmToa Alta Municipio 11 kmNaranjito Municipio 11 kmComerío Municipio 13 kmCataño Municipio 13 kmSan Juan Municipio 14 kmToa Baja Municipio 15 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
1:29 pm AST on 7 August 2026 ()
Where
6 km (4 mi) southwest of Guaynabo, PR · earthquakes near Guaynabo
Magnitude
M 2.7 (md)
Depth
58 km below the surface
Felt
no reports yet
Nearest
Bayamón Municipio, 3 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 96 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Guaynabo, 6 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Bayamón, Pájaros, Aguas Buenas, Mucarabones, Naranjito, Candelaria.

How big was it?

This earthquake released about 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.6 on 2019-03-12 — about 660 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 7 km SSE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 28 km NW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.3235, -66.1525. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Bayamón Municipio, PR 3 km (2 mi) NNW earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 5 km (3 mi) ENE earthquakes near Guaynabo Municipio
Aguas Buenas Municipio, PR 8 km (5 mi) SSE earthquakes near Aguas Buenas Municipio
Toa Alta Municipio, PR 11 km (7 mi) WNW earthquakes near Toa Alta Municipio
Naranjito Municipio, PR 11 km (7 mi) WSW earthquakes near Naranjito Municipio
Comerío Municipio, PR 13 km (8 mi) SSW earthquakes near Comerío Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

23 earthquakes have been recorded within 50 km since this one.

  1. 2.2 1 km WNW of Mariano Colón, Puerto Rico
  2. 1.5 0 km SSW of Barranquitas, Puerto Rico
  3. 2.8 3 km WNW of Orocovis, Puerto Rico
  4. 2.8 18 km NNE of Tierras Nuevas Poniente, Puerto Rico
  5. 1.9 2 km NNW of Aibonito, Puerto Rico
  6. 3.1 22 km NNE of Brenas, Puerto Rico
  7. 3.1 7 km NNW of Trujillo Alto, Puerto Rico
  8. 2.1 4 km NW of Orocovis, Puerto Rico
  9. 3.4 2 km NW of Corozal, Puerto Rico
  10. 2.6 4 km NNE of Aguas Buenas, Puerto Rico
  11. 2.6 3 km SE of Galateo, Puerto Rico
  12. 2.8 8 km NNE of Tierras Nuevas Poniente, Puerto Rico
  13. 2.5 6 km SSE of Salinas, Puerto Rico
  14. 2.6 5 km NW of Guayabal, Puerto Rico
  15. 2.0 0 km W of Mariano Colón, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.