QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

72 km NNE of Luquillo, Puerto Rico

· 54 km deep · released about 17 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 67 kmLuquillo Municipio 73 kmCulebra Municipio 75 kmRío Grande Municipio 76 kmLoíza Municipio 77 kmCeiba Municipio 83 kmCarolina Municipio 83 kmCanóvanas Municipio 84 kmSan Juan Municipio 88 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 4.0 (md)
Depth
54 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Fajardo Municipio, 67 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 783 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 440× the energy of this one
  3. Magna, Utah 2020 M 5.7 310× the energy of this one
  4. This earthquake M 4.0 about 17 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 36× 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 18.9833, -65.4763. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 67 km (42 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 73 km (45 mi) NNE of here earthquakes near Luquillo Municipio
Culebra Municipio, PR 75 km (47 mi) NNW of here earthquakes near Culebra Municipio
Río Grande Municipio, PR 76 km (47 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 77 km (48 mi) NE of here earthquakes near Loíza Municipio
Ceiba Municipio, PR 83 km (51 mi) N of here earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 3.0 74 km N of Suárez, Puerto Rico
  2. 3.2 51 km NNE of Vieques, Puerto Rico
  3. 3.5 83 km NNE of Vieques, Puerto Rico
  4. 3.4 106 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.6 66 km N of Culebra, Puerto Rico
  6. 3.4 60 km NNW of Charlotte Amalie, U.S. Virgin Islands
  7. 3.6 65 km NNE of Vieques, Puerto Rico
  8. 3.1 68 km NNE of Vieques, Puerto Rico
  9. 3.7 87 km NNE of Vieques, Puerto Rico
  10. 3.7 86 km NNE of Vieques, Puerto Rico
  11. 3.2 25 km NNE of Luquillo, Puerto Rico
  12. 3.1 76 km NNE of Luquillo, Puerto Rico
  13. 3.3 102 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 34 km NNE of Luquillo, Puerto Rico
  15. 2.9 108 km NNW of Charlotte Amalie, U.S. Virgin Islands

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 14 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.