QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

12 km NNE of Fajardo, Puerto Rico

· 109 km deep · released about 3.2 tons of TNT

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10 km30 km60 km120 km N Fajardo Municipio 4 kmLuquillo Municipio 13 kmCeiba Municipio 19 kmRío Grande Municipio 21 kmNaguabo Municipio 28 kmCanóvanas Municipio 32 kmCulebra Municipio 33 kmLoíza Municipio 36 kmHumacao Municipio 38 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
109 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 4 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 312 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 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 18.4241, -65.6026. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 4 km (3 mi) NNW of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 13 km (8 mi) ENE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 19 km (12 mi) N of here earthquakes near Ceiba Municipio
Río Grande Municipio, PR 21 km (13 mi) ENE of here earthquakes near Río Grande Municipio
Naguabo Municipio, PR 28 km (17 mi) NNE of here earthquakes near Naguabo Municipio
Canóvanas Municipio, PR 32 km (20 mi) ENE of here earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 2.5 27 km NNE of Vieques, Puerto Rico
  2. 2.0 11 km SSE of Punta Santiago, Puerto Rico
  3. 3.1 21 km NE of Culebra, Puerto Rico
  4. 3.8 30 km NNE of Luquillo, Puerto Rico
  5. 2.3 5 km W of Campo Rico, Puerto Rico
  6. 2.8 8 km NE of Vieques, Puerto Rico
  7. 3.0 47 km NNE of Vieques, Puerto Rico
  8. 3.0 19 km WSW of Esperanza, Puerto Rico
  9. 3.1 9 km SSE of Daguao, Puerto Rico
  10. 2.6 2 km SW of Campo Rico, Puerto Rico
  11. 1.9 4 km SE of Jagual, Puerto Rico
  12. 3.1 39 km N of Loíza, Puerto Rico
  13. 3.3 39 km N of Culebra, Puerto Rico
  14. 2.7 4 km ESE of Jagual, Puerto Rico
  15. 2.9 6 km NNW of Loíza, 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 4.2 on 2023-12-25 — it released about 8.5 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.