QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

21 km NE of Culebra, Puerto Rico

· 113 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 21 kmVieques Municipio 45 kmFajardo Municipio 47 kmCeiba Municipio 54 kmLuquillo Municipio 60 kmNaguabo Municipio 67 kmRío Grande Municipio 70 kmHumacao Municipio 75 kmCanóvanas Municipio 79 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 3.1 (md)
Depth
113 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 21 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 191 days ago

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

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× 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.

Where

Epicentre 18.4233, -65.1413. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 21 km (13 mi) ENE of here earthquakes near Culebra Municipio
Vieques Municipio, PR 45 km (28 mi) NE of here earthquakes near Vieques Municipio
Fajardo Municipio, PR 47 km (29 mi) E of here earthquakes near Fajardo Municipio
Ceiba Municipio, PR 54 km (34 mi) ENE of here earthquakes near Ceiba Municipio
Luquillo Municipio, PR 60 km (37 mi) E of here earthquakes near Luquillo Municipio
Naguabo Municipio, PR 67 km (42 mi) ENE of here earthquakes near Naguabo Municipio

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

Aftershocks so far

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

  1. 3.2 46 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.1 12 km NNE of Charlotte Amalie, U.S. Virgin Islands
  3. 3.1 42 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 2.6 45 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 2.9 47 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.1 41 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.0 48 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 2.5 47 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.4 48 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.0 44 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 4.1 49 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 2.5 14 km N of Isabel Segunda, Puerto Rico
  13. 2.9 24 km SSW of Cruz Bay, U.S. Virgin Islands
  14. 3.0 22 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.3 58 km NNE of Culebra, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2021-03-09 — it released about 410 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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