QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

102 km NNE of Vieques, Puerto Rico

· 20 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 98 kmCulebra Municipio 103 kmLuquillo Municipio 104 kmRío Grande Municipio 106 kmLoíza Municipio 107 kmCarolina Municipio 113 kmCeiba Municipio 113 kmCanóvanas Municipio 115 kmSan Juan Municipio 116 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
20 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 98 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 16 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 2 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 86,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,700× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.1× 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 19.2515, -65.3958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 98 km (61 mi) NNE of here earthquakes near Fajardo Municipio
Culebra Municipio, PR 103 km (64 mi) N of here earthquakes near Culebra Municipio
Luquillo Municipio, PR 104 km (64 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 106 km (66 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 107 km (66 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 113 km (70 mi) NNE of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.3 133 km NNE of Vieques, Puerto Rico
  2. 3.3 103 km NNE of Vieques, Puerto Rico
  3. 2.9 73 km N of Culebra, Puerto Rico
  4. 3.0 58 km N of Culebra, Puerto Rico
  5. 3.3 110 km N of Suárez, Puerto Rico
  6. 3.4 117 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.3 76 km NNE of Vieques, Puerto Rico
  8. 3.2 122 km N of Culebra, Puerto Rico
  9. 3.5 137 km NNE of Vieques, Puerto Rico
  10. 3.4 130 km NNE of Vieques, Puerto Rico
  11. 3.6 141 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 3.5 59 km N of Culebra, Puerto Rico
  13. 3.4 141 km NNE of Vieques, Puerto Rico
  14. 3.6 139 km NNE of Suárez, 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 120 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.