QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9Md

68 km N of Culebra, Puerto Rico

· 15 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 66 kmCulebra Municipio 67 kmLuquillo Municipio 73 kmRío Grande Municipio 78 kmCeiba Municipio 81 kmLoíza Municipio 83 kmCanóvanas Municipio 88 kmCarolina Municipio 89 kmVieques Municipio 90 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 3.9 (Md)
Depth
15 km below the surface
Felt
8 reports · strongest reported intensity III
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Fajardo Municipio, 66 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3672 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 18.9253, -65.3366. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 66 km (41 mi) NNE of here earthquakes near Fajardo Municipio
Culebra Municipio, PR 67 km (41 mi) N of here earthquakes near Culebra Municipio
Luquillo Municipio, PR 73 km (46 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 78 km (49 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 81 km (50 mi) NNE of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 83 km (52 mi) NE of here earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 2.3 48 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 2.1 59 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 2.2 60 km NNW of Charlotte Amalie, U.S. Virgin Islands
  4. 2.3 59 km NNW of Charlotte Amalie, U.S. Virgin Islands
  5. 2.3 77 km N of Culebra, Puerto Rico
  6. 2.4 70 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 2.6 82 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 2.2 48 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 1.9 52 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.0 74 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 2.1 51 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 2.2 56 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 2.3 52 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 1.5 57 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 2.1 61 km N 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.