QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

76 km N of Culebra, Puerto Rico

· 23 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 75 kmFajardo Municipio 78 kmLuquillo Municipio 87 kmRío Grande Municipio 92 kmCeiba Municipio 93 kmLoíza Municipio 98 kmVieques Municipio 99 kmCanóvanas Municipio 102 kmNaguabo Municipio 103 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 3.7 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 75 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1461 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 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 18.9923, -65.2131. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 75 km (46 mi) N of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 78 km (49 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 87 km (54 mi) NE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 92 km (57 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 93 km (58 mi) NNE of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 98 km (61 mi) NE of here earthquakes near Loíza 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. 4.0 Puerto Rico region
  2. 3.3 78 km N of Culebra, Puerto Rico
  3. 3.3 85 km NNE of Luquillo, Puerto Rico
  4. 3.1 63 km N of Cruz Bay, U.S. Virgin Islands
  5. 3.2 74 km NNW of Charlotte Amalie, U.S. Virgin Islands
  6. 3.0 Virgin Islands
  7. 3.4 66 km N of Culebra, Puerto Rico
  8. 3.3 56 km NNE of Luquillo, Puerto Rico
  9. 3.1 70 km N of Culebra, Puerto Rico
  10. 3.3 70 km N of Culebra, Puerto Rico
  11. 3.6 Puerto Rico region
  12. 3.3 67 km N of Culebra, Puerto Rico
  13. 3.0 70 km N of Culebra, Puerto Rico
  14. 3.2 Puerto Rico region
  15. 3.1 67 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 5.0 on 2021-02-06 — it released about 86 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.