QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

16 km NW of Culebra, Puerto Rico

· 102 km deep · released about 1.2 tons of TNT

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10 km30 km60 km120 km N Culebra Municipio 15 kmFajardo Municipio 18 kmCeiba Municipio 27 kmLuquillo Municipio 31 kmVieques Municipio 31 kmNaguabo Municipio 40 kmRío Grande Municipio 40 kmHumacao Municipio 49 kmCanóvanas Municipio 50 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
102 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 15 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1359 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 1.2 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 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,400× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× 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 18.4038, -65.4210. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 15 km (9 mi) NW of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 18 km (11 mi) E of here earthquakes near Fajardo Municipio
Ceiba Municipio, PR 27 km (17 mi) NE of here earthquakes near Ceiba Municipio
Luquillo Municipio, PR 31 km (19 mi) E of here earthquakes near Luquillo Municipio
Vieques Municipio, PR 31 km (19 mi) N of here earthquakes near Vieques Municipio
Naguabo Municipio, PR 40 km (25 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

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

  1. 3.2 34 km NNW of Culebra, Puerto Rico
  2. 3.2 1 km NE of Bajandas, Puerto Rico
  3. 3.4 33 km NNW of Culebra, Puerto Rico
  4. 3.4 1 km W of Punta Santiago, Puerto Rico
  5. 2.6 25 km NNW of Charlotte Amalie, U.S. Virgin Islands
  6. 3.3 59 km NNE of Luquillo, Puerto Rico
  7. 2.9 1 km W of Punta Santiago, Puerto Rico
  8. 4.2 Puerto Rico region
  9. 2.9 9 km SSE of Bajandas, Puerto Rico
  10. 2.9 29 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  12. 2.4 2 km NW of Punta Santiago, Puerto Rico
  13. 3.2 Puerto Rico region
  14. 3.4 3 km NNE of Benitez, Puerto Rico
  15. 2.9 2 km NNW of Punta Santiago, 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 2021-10-08 — it released about 200 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.