QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

43 km NNE of Culebra, Puerto Rico

· 56 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 41 kmFajardo Municipio 55 kmVieques Municipio 67 kmLuquillo Municipio 67 kmCeiba Municipio 67 kmRío Grande Municipio 75 kmNaguabo Municipio 80 kmCanóvanas Municipio 86 kmLoíza Municipio 86 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
56 km below the surface
Felt
1 report · strongest reported intensity IV
Nearest
Culebra Municipio, 41 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1303 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 18.6715, -65.1575. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 41 km (26 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 55 km (34 mi) NE of here earthquakes near Fajardo Municipio
Vieques Municipio, PR 67 km (42 mi) NNE of here earthquakes near Vieques Municipio
Luquillo Municipio, PR 67 km (42 mi) ENE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 67 km (42 mi) NE of here earthquakes near Ceiba Municipio
Río Grande Municipio, PR 75 km (47 mi) ENE of here earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.7 53 km N of Culebra, Puerto Rico
  2. 3.2 80 km N of Culebra, Puerto Rico
  3. 3.3 73 km N of Culebra, Puerto Rico
  4. 3.5 72 km NNE of Luquillo, Puerto Rico
  5. 3.5 76 km NNE of Luquillo, Puerto Rico
  6. 3.4 84 km NNE of Luquillo, Puerto Rico
  7. 2.8 85 km N of Culebra, Puerto Rico
  8. 3.4 81 km NNE of Luquillo, Puerto Rico
  9. 3.3 47 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.1 41 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.2 2 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.2 34 km NNW of Culebra, Puerto Rico
  13. 3.8 38 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.4 33 km NNW of Culebra, Puerto Rico
  15. 3.8 49 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2021-03-09 — it released about 310 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.