QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

70 km NNE of Luquillo, Puerto Rico

· 36 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 65 kmCulebra Municipio 70 kmLuquillo Municipio 71 kmRío Grande Municipio 75 kmLoíza Municipio 78 kmCeiba Municipio 80 kmCarolina Municipio 84 kmCanóvanas Municipio 84 kmNaguabo Municipio 88 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
36 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 65 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 513 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 1.8 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 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× 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 18.9498, -65.4285. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 65 km (40 mi) NNE of here earthquakes near Fajardo Municipio
Culebra Municipio, PR 70 km (44 mi) N of here earthquakes near Culebra Municipio
Luquillo Municipio, PR 71 km (44 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 75 km (46 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 78 km (48 mi) NE of here earthquakes near Loíza Municipio
Ceiba Municipio, PR 80 km (50 mi) NNE of here earthquakes near Ceiba 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. 3.1 49 km NNE of Vieques, Puerto Rico
  2. 3.1 55 km NNE of Vieques, Puerto Rico
  3. 3.4 65 km N of Culebra, Puerto Rico
  4. 3.5 70 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.2 52 km N of Culebra, Puerto Rico
  6. 3.5 96 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.1 71 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.2 49 km N of Culebra, Puerto Rico
  9. 3.2 67 km N of Culebra, Puerto Rico
  10. 3.8 104 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.3 59 km N of Culebra, Puerto Rico
  12. 3.5 66 km N of Culebra, Puerto Rico
  13. 3.5 76 km N of Culebra, Puerto Rico
  14. 3.4 79 km NNE of Luquillo, Puerto Rico
  15. 3.2 24 km NE 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 130 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.