QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

106 km NNE of Vieques, Puerto Rico

· 75 km deep · released about 2.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 105 kmLuquillo Municipio 109 kmLoíza Municipio 109 kmRío Grande Municipio 111 kmCulebra Municipio 112 kmCarolina Municipio 115 kmSan Juan Municipio 118 kmCanóvanas Municipio 119 kmCeiba Municipio 120 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
75 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Fajardo Municipio, 105 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 556 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 2.2 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 78,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.6× 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 19.3195, -65.4657. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 105 km (65 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 109 km (68 mi) NNE of here earthquakes near Luquillo Municipio
Loíza Municipio, PR 109 km (68 mi) NNE of here earthquakes near Loíza Municipio
Río Grande Municipio, PR 111 km (69 mi) NNE of here earthquakes near Río Grande Municipio
Culebra Municipio, PR 112 km (69 mi) N of here earthquakes near Culebra Municipio
Carolina Municipio, PR 115 km (72 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

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

  1. 3.5 66 km N of Culebra, Puerto Rico
  2. 3.5 76 km N of Culebra, Puerto Rico
  3. 3.4 79 km NNE of Luquillo, Puerto Rico
  4. 3.7 107 km N of Suárez, Puerto Rico
  5. 3.7 122 km N of Culebra, Puerto Rico
  6. 3.4 133 km NNE of Vieques, Puerto Rico
  7. 3.8 102 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.5 131 km N of Suárez, Puerto Rico
  9. 3.5 141 km NNE of Vieques, Puerto Rico
  10. 3.5 138 km NNE of Vieques, Puerto Rico
  11. 3.6 96 km NNE of Vieques, Puerto Rico
  12. 3.6 99 km NNE of Vieques, Puerto Rico
  13. 3.5 119 km NNE of Vieques, Puerto Rico
  14. 3.6 90 km NNE of Luquillo, Puerto Rico
  15. 3.7 139 km NNE of Vieques, 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 4.7 on 2020-11-26 — it released about 80 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.