QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9Md

120 km NNE of Vieques, Puerto Rico

· 101 km deep · released about 11 tons of TNT

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10 km30 km60 km120 km N Fajardo Municipio 119 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
101 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 119 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3624 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 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 19.4428, -65.4365. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 119 km (74 mi) N of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 123 km (76 mi) NNE of here earthquakes near Luquillo Municipio
Loíza Municipio, PR 123 km (76 mi) NNE of here earthquakes near Loíza Municipio
Río Grande Municipio, PR 125 km (77 mi) NNE of here earthquakes near Río Grande Municipio
Carolina Municipio, PR 129 km (80 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 132 km (82 mi) NNE of here earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 2.3 87 km NNE of Vieques, Puerto Rico
  2. 2.5 86 km NNE of Vieques, Puerto Rico
  3. 2.9 84 km N of Culebra, Puerto Rico
  4. 2.8 104 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 2.6 160 km NNE of Vieques, Puerto Rico
  6. 2.4 126 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 2.3 113 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.1 139 km NNE of Vieques, Puerto Rico
  9. 3.0 84 km N of Culebra, Puerto Rico
  10. 3.2 86 km N of Culebra, Puerto Rico
  11. 3.0 141 km NNE of Vieques, Puerto Rico
  12. 3.2 91 km N of Culebra, Puerto Rico
  13. 3.2 85 km N of Culebra, Puerto Rico
  14. 3.1 96 km N of Culebra, Puerto Rico
  15. 2.7 96 km N of Culebra, 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.

On USGS

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