QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

Earthquake near Culebra, PR

Yes: an earthquake was likely felt in Culebra in the last 24 hours. M 2.9, 25 km (15 mi) ENE of Culebra, at 6:51 am AST on 11 November 2026 (10:51 UTC); the estimated shaking in Culebra was intensity II (weak). Every earthquake near Culebra

This page: a magnitude 3.6 earthquake was recorded 39 km (25 mi) northeast of Culebra, PR, at 2:31 am AST on 27 February 2023 (06:31 UTC), 77 km deep.

USGS: Puerto Rico region

2:31 am AST, Feb 27, 2023 · · 77 km deep · released about 3.3 tons of TNT

Every earthquake near Culebra Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 38 kmFajardo Municipio 58 kmVieques Municipio 64 kmCeiba Municipio 68 kmLuquillo Municipio 71 kmRío Grande Municipio 79 kmNaguabo Municipio 81 kmCanóvanas Municipio 90 kmHumacao Municipio 90 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
2:31 am AST on 27 February 2023 ()
Where
39 km (25 mi) northeast of Culebra, PR · earthquakes near Culebra
Magnitude
M 3.6 (md)
Depth
77 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 38 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1354 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 Culebra, 39 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.

How big was it?

This earthquake released about 3.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 51,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.9× 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 in our catalogue was M 4.8 on 2021-03-09 — about 72 times the energy of this one.

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 18.5895, -65.0801. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 38 km (24 mi) SW earthquakes near Culebra Municipio
Fajardo Municipio, PR 58 km (36 mi) WSW earthquakes near Fajardo Municipio
Vieques Municipio, PR 64 km (40 mi) SW earthquakes near Vieques Municipio
Ceiba Municipio, PR 68 km (42 mi) WSW earthquakes near Ceiba Municipio
Luquillo Municipio, PR 71 km (44 mi) WSW earthquakes near Luquillo Municipio
Río Grande Municipio, PR 79 km (49 mi) WSW earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.0 51 km N of Cruz Bay, U.S. Virgin Islands
  2. 3.0 Puerto Rico region
  3. 3.9 18 km SE of Culebra, Puerto Rico
  4. 3.9 Virgin Islands
  5. 3.4 74 km NNW of Charlotte Amalie, U.S. Virgin Islands
  6. 3.0 Virgin Islands
  7. 3.2 Virgin Islands
  8. 3.7 60 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.4 72 km NNW of Charlotte Amalie, U.S. Virgin Islands
  10. 3.7 53 km N of Culebra, Puerto Rico
  11. 3.3 47 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.1 41 km NNW of Charlotte Amalie, U.S. Virgin Islands
  13. 3.2 2 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.2 34 km NNW of Culebra, Puerto Rico
  15. 3.8 38 km N of Charlotte Amalie, U.S. Virgin Islands

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.