QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

76 km NNE of Vieques, Puerto Rico

Yes. A magnitude 3.3 earthquake was recorded 76 km NNE of Vieques, Puerto Rico, 91 km (56 mi) NE of San Juan, PR, at 8:05 pm AST on 15 September 2026 (00:05 UTC), 6.6 km deep.

91 km (56 mi) NE of San Juan, PR

· 6.6 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 76 kmLuquillo Municipio 79 kmLoíza Municipio 80 kmRío Grande Municipio 81 kmCarolina Municipio 86 kmCulebra Municipio 86 kmCanóvanas Municipio 89 kmSan Juan Municipio 89 kmCeiba Municipio 91 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
Magnitude
M 3.3 (md)
Depth
6.6 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 76 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 56 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, people at rest would likely notice it out to about 52 km (32 mi) from the epicentre. 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.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 4.8 on 2021-03-09 — about 180 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.1 122 km NNE of Vieques, Puerto Rico · 46 km NE of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 27 km NW of this epicentre
  3. 5.0 73 km NNE of Vieques, Puerto Rico · 10 km SE 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 19.0657, -65.5608. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fajardo Municipio, PR 76 km (47 mi) S earthquakes near Fajardo Municipio
Luquillo Municipio, PR 79 km (49 mi) SSW earthquakes near Luquillo Municipio
Loíza Municipio, PR 80 km (50 mi) SSW earthquakes near Loíza Municipio
Río Grande Municipio, PR 81 km (50 mi) SSW earthquakes near Río Grande Municipio
Carolina Municipio, PR 86 km (53 mi) SSW earthquakes near Carolina Municipio
Culebra Municipio, PR 86 km (54 mi) SSE earthquakes near Culebra Municipio

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

Aftershocks so far

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

  1. 3.1 53 km NNW of Culebra, Puerto Rico
  2. 3.7 69 km N of Culebra, Puerto Rico
  3. 2.9 75 km NNE of Vieques, Puerto Rico
  4. 3.6 124 km NNE of Vieques, Puerto Rico
  5. 3.1 62 km NNE of Luquillo, Puerto Rico
  6. 3.0 49 km N of Suárez, Puerto Rico
  7. 3.1 71 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 2.8 75 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.4 65 km NNW of Charlotte Amalie, U.S. Virgin Islands
  10. 3.2 65 km N of Culebra, Puerto Rico
  11. 3.2 72 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 3.4 81 km NNE of Luquillo, Puerto Rico
  13. 3.0 79 km NNW of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 41 km NNE of Luquillo, Puerto Rico
  15. 3.3 103 km NNE of Vieques, 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.