QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

73 km N of Culebra, Puerto Rico

· 9.4 km deep · released about 1,700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 68 kmCulebra Municipio 71 kmLuquillo Municipio 75 kmRío Grande Municipio 79 kmLoíza Municipio 83 kmCeiba Municipio 83 kmCanóvanas Municipio 89 kmCarolina Municipio 89 kmNaguabo Municipio 92 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 3.2 (md)
Depth
9.4 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Fajardo Municipio, 68 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1419 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 1,700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 200,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 8,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,200× the energy of this one
  4. This earthquake M 3.2 about 1,700 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.8× 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 18.9645, -65.3738. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 68 km (42 mi) NNE of here earthquakes near Fajardo Municipio
Culebra Municipio, PR 71 km (44 mi) N of here earthquakes near Culebra Municipio
Luquillo Municipio, PR 75 km (47 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 79 km (49 mi) NE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 83 km (52 mi) NE of here earthquakes near Loíza Municipio
Ceiba Municipio, PR 83 km (52 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

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

  1. 3.1 Puerto Rico region
  2. 3.2 75 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 2.9 Puerto Rico region
  4. 3.3 Puerto Rico region
  5. 3.3 72 km NNW of Charlotte Amalie, U.S. Virgin Islands
  6. 4.2 Puerto Rico region
  7. 3.2 Puerto Rico region
  8. 3.4 Puerto Rico region
  9. 3.0 54 km NNW of Charlotte Amalie, U.S. Virgin Islands
  10. 3.1 57 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 2.8 27 km NNE of Luquillo, Puerto Rico
  12. 3.1 Puerto Rico region
  13. 3.5 76 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.6 87 km N of Culebra, Puerto Rico
  15. 3.7 82 km NNE of Suárez, 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 280 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.