QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

29 km NNE of Luquillo, Puerto Rico

· 75 km deep · released about 3.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 24 kmLuquillo Municipio 30 kmRío Grande Municipio 35 kmCeiba Municipio 39 kmCulebra Municipio 41 kmLoíza Municipio 43 kmCanóvanas Municipio 45 kmNaguabo Municipio 47 kmCarolina Municipio 48 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 3.5 (md)
Depth
75 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Fajardo Municipio, 24 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1486 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 3.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 53,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.7× 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 18.6033, -65.5686. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 24 km (15 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 30 km (19 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 35 km (22 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 39 km (24 mi) N of here earthquakes near Ceiba Municipio
Culebra Municipio, PR 41 km (26 mi) NW of here earthquakes near Culebra Municipio
Loíza Municipio, PR 43 km (27 mi) ENE of here earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 3.4 Puerto Rico region
  2. 3.3 16 km NW of Culebra, Puerto Rico
  3. 2.8 Puerto Rico region
  4. 2.8 27 km NNE of Luquillo, Puerto Rico
  5. 3.1 Puerto Rico region
  6. 3.3 57 km N of Culebra, Puerto Rico
  7. 3.5 68 km N of Culebra, Puerto Rico
  8. 3.4 25 km NNE of Playa Fortuna, Puerto Rico
  9. 3.5 74 km NNE of Vieques, Puerto Rico
  10. 3.4 30 km NNE of Vieques, Puerto Rico
  11. 3.4 67 km N of Culebra, Puerto Rico
  12. 3.3 41 km N of Culebra, Puerto Rico
  13. 3.4 42 km NNE of Luquillo, Puerto Rico
  14. 3.2 73 km N of Culebra, Puerto Rico
  15. 3.1 64 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 75 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.