QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

25 km NNE of Playa Fortuna, Puerto Rico

· 19 km deep · released about 1.6 tons of TNT

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10 km30 km60 km120 km N Fajardo Municipio 26 kmLuquillo Municipio 26 kmRío Grande Municipio 29 kmLoíza Municipio 34 kmCanóvanas Municipio 38 kmCarolina Municipio 39 kmCeiba Municipio 39 kmNaguabo Municipio 44 kmTrujillo Alto Municipio 46 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
19 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 26 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1385 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 18.6025, -65.6698. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 26 km (16 mi) NNW of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 26 km (16 mi) N of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 29 km (18 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 34 km (21 mi) ENE of here earthquakes near Loíza Municipio
Canóvanas Municipio, PR 38 km (24 mi) NE of here earthquakes near Canóvanas Municipio
Carolina Municipio, PR 39 km (24 mi) NE of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 2.9 1 km W of Punta Santiago, Puerto Rico
  2. 3.1 6 km ENE of San Juan, Puerto Rico
  3. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  4. 2.4 2 km NW of Punta Santiago, Puerto Rico
  5. 3.2 Puerto Rico region
  6. 3.4 3 km NNE of Benitez, Puerto Rico
  7. 2.8 0 km SSW of San Juan, Puerto Rico
  8. 2.9 2 km NNW of Punta Santiago, Puerto Rico
  9. 3.1 68 km NNE of Suárez, Puerto Rico
  10. 2.7 2 km WNW of Campo Rico, Puerto Rico
  11. 2.8 1 km W of San Isidro, Puerto Rico
  12. 2.9 11 km WNW of Culebra, Puerto Rico
  13. 2.9 49 km NE of Luquillo, Puerto Rico
  14. 3.3 Puerto Rico region
  15. 3.2 3 km NNW of San Juan, 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.