QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

32 km NNE of Luquillo, Puerto Rico

· 69 km deep · released about 1.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 28 kmLuquillo Municipio 33 kmRío Grande Municipio 37 kmCeiba Municipio 43 kmLoíza Municipio 44 kmCulebra Municipio 44 kmCanóvanas Municipio 47 kmCarolina Municipio 49 kmNaguabo Municipio 50 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
69 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 28 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 243 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 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 18.6363, -65.5732. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 28 km (17 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 33 km (21 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 37 km (23 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 43 km (27 mi) N of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 44 km (28 mi) ENE of here earthquakes near Loíza Municipio
Culebra Municipio, PR 44 km (28 mi) NW of here earthquakes near Culebra Municipio

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

Aftershocks so far

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

  1. 3.6 76 km N of Culebra, Puerto Rico
  2. 3.3 76 km N of Culebra, Puerto Rico
  3. 3.1 55 km NNE of San Juan, Puerto Rico
  4. 3.0 60 km N of Loíza, Puerto Rico
  5. 2.9 23 km NNE of Luquillo, Puerto Rico
  6. 3.3 41 km N of Culebra, Puerto Rico
  7. 3.2 48 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.2 51 km NNE of Vieques, Puerto Rico
  9. 3.1 73 km N of Culebra, Puerto Rico
  10. 3.3 20 km NE of Luquillo, Puerto Rico
  11. 2.5 27 km NNE of Vieques, Puerto Rico
  12. 3.2 76 km N of Culebra, Puerto Rico
  13. 3.4 49 km N of Suárez, Puerto Rico
  14. 3.1 59 km N of Loíza, Puerto Rico
  15. 3.8 30 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 150 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.