QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

66 km N of Culebra, Puerto Rico

· 24 km deep · released about 18 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 64 kmFajardo Municipio 68 kmLuquillo Municipio 77 kmCeiba Municipio 82 kmRío Grande Municipio 83 kmVieques Municipio 89 kmLoíza Municipio 90 kmNaguabo Municipio 93 kmCanóvanas Municipio 93 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 4.0 (md)
Depth
24 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Culebra Municipio, 64 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 18 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 420× the energy of this one
  3. Magna, Utah 2020 M 5.7 300× the energy of this one
  4. This earthquake M 4.0 about 18 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 38× 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 18.9023, -65.2418. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 64 km (40 mi) N of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 68 km (42 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 77 km (48 mi) NE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 82 km (51 mi) NNE of here earthquakes near Ceiba Municipio
Río Grande Municipio, PR 83 km (51 mi) NE of here earthquakes near Río Grande Municipio
Vieques Municipio, PR 89 km (55 mi) NNE of here earthquakes near Vieques Municipio

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

Aftershocks so far

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

  1. 3.1 74 km NNW of Charlotte Amalie, U.S. Virgin Islands
  2. 3.4 77 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 3.3 76 km N of Culebra, Puerto Rico
  4. 3.5 28 km NNE of Culebra, Puerto Rico
  5. 3.7 95 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.0 76 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.4 81 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.3 67 km NNE of Luquillo, Puerto Rico
  9. 3.9 Puerto Rico region
  10. 3.5 32 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.9 109 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.1 Puerto Rico region
  13. 3.5 34 km N of Culebra, Puerto Rico
  14. 3.2 66 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.8 62 km N 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 13 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.