QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

68 km NNE of Vieques, Puerto Rico

· 39 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 66 kmLuquillo Municipio 70 kmRío Grande Municipio 72 kmLoíza Municipio 73 kmCulebra Municipio 76 kmCarolina Municipio 79 kmCanóvanas Municipio 80 kmCeiba Municipio 81 kmSan Juan Municipio 83 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 3.1 (md)
Depth
39 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 66 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 605 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 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.9737, -65.5385. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 66 km (41 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 70 km (43 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 72 km (45 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 73 km (45 mi) NE of here earthquakes near Loíza Municipio
Culebra Municipio, PR 76 km (47 mi) NNW of here earthquakes near Culebra Municipio
Carolina Municipio, PR 79 km (49 mi) NE of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.4 33 km NNE of Vieques, Puerto Rico
  2. 3.3 85 km N of Culebra, Puerto Rico
  3. 3.3 99 km N of Culebra, Puerto Rico
  4. 3.4 62 km NNW of Charlotte Amalie, U.S. Virgin Islands
  5. 3.1 58 km NNE of Luquillo, Puerto Rico
  6. 3.8 113 km NNE of Vieques, Puerto Rico
  7. 3.5 74 km N of Culebra, Puerto Rico
  8. 3.3 63 km N of Loíza, Puerto Rico
  9. 3.9 52 km N of Culebra, Puerto Rico
  10. 3.2 72 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 4.0 66 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 3.3 77 km NNE of Vieques, Puerto Rico
  13. 3.4 60 km N of Culebra, Puerto Rico
  14. 2.9 53 km NNE of Luquillo, Puerto Rico
  15. 2.9 44 km NNE of Luquillo, 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 330 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.