QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

37 km NNE of Culebra, Puerto Rico

· 82 km deep · released about 1.7 tons of TNT

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10 km30 km60 km120 km N Culebra Municipio 36 kmFajardo Municipio 48 kmLuquillo Municipio 60 kmCeiba Municipio 60 kmVieques Municipio 61 kmRío Grande Municipio 68 kmNaguabo Municipio 73 kmCanóvanas Municipio 79 kmLoíza Municipio 80 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 3.4 (md)
Depth
82 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 36 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1276 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 1.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 99,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,100× the energy of this one
  4. This earthquake M 3.4 about 1.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.6× 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 18.6347, -65.2125. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 36 km (22 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 48 km (30 mi) NE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 60 km (37 mi) ENE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 60 km (38 mi) NE of here earthquakes near Ceiba Municipio
Vieques Municipio, PR 61 km (38 mi) NNE of here earthquakes near Vieques Municipio
Río Grande Municipio, PR 68 km (42 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

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

  1. 3.8 49 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.1 23 km N of Cruz Bay, U.S. Virgin Islands
  3. 3.2 36 km N of Cruz Bay, U.S. Virgin Islands
  4. 3.1 69 km N of Culebra, Puerto Rico
  5. 3.4 39 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.3 62 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.7 71 km NNE of Luquillo, Puerto Rico
  8. 2.6 25 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.3 59 km NNE of Luquillo, Puerto Rico
  10. 3.8 72 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 3.5 72 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.1 43 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 4.2 Puerto Rico region
  14. 3.2 81 km N of Culebra, Puerto Rico
  15. 2.9 29 km NNW 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 140 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.