QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

72 km N of Culebra, Puerto Rico

· 74 km deep · released about 5.9 tons of TNT

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10 km30 km60 km120 km N Culebra Municipio 71 kmFajardo Municipio 74 kmLuquillo Municipio 82 kmRío Grande Municipio 88 kmCeiba Municipio 88 kmLoíza Municipio 94 kmVieques Municipio 95 kmCanóvanas Municipio 98 kmNaguabo Municipio 98 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
74 km below the surface
Felt
1 report · strongest reported intensity V
Nearest
Culebra Municipio, 71 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1759 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 5.9 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 29,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 900× the energy of this one
  4. This earthquake M 3.7 about 5.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 12× 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 18.9573, -65.2363. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 71 km (44 mi) N of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 74 km (46 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 82 km (51 mi) NE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 88 km (54 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 88 km (55 mi) NNE of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 94 km (58 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

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

  1. 3.5 30 km NNW of Charlotte Amalie, U.S. Virgin Islands
  2. 3.5 84 km NNE of Luquillo, Puerto Rico
  3. 3.5 106 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.7 102 km NNW of Charlotte Amalie, U.S. Virgin Islands
  5. 3.0 66 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.5 74 km N of Culebra, Puerto Rico
  7. 3.7 75 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 4.0 66 km N of Culebra, Puerto Rico
  9. 3.7 67 km N of Culebra, Puerto Rico
  10. 3.6 Puerto Rico region
  11. 3.4 86 km N of Culebra, Puerto Rico
  12. 3.6 63 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 3.7 25 km NNE of Culebra, Puerto Rico
  14. 3.2 44 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.4 75 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 5.0 on 2021-02-06 — it released about 78 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.