QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

120 km NNE of Vieques, Puerto Rico

· 74 km deep · released about 18 tons of TNT

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10 km30 km60 km120 km N Fajardo Municipio 118 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
74 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 118 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1239 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 18 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 9,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 420× the energy of this one
  3. Magna, Utah 2020 M 5.7 300× the energy of this one
  4. This earthquake M 4.0 about 18 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 38× 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 19.4276, -65.3783. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 118 km (73 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 124 km (77 mi) NNE of here earthquakes near Loíza Municipio
Río Grande Municipio, PR 125 km (78 mi) NNE of here earthquakes near Río Grande Municipio
Carolina Municipio, PR 130 km (81 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 133 km (83 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. 4.0 122 km N of Suárez, Puerto Rico
  2. 3.8 124 km N of Suárez, Puerto Rico
  3. 3.6 125 km N of Suárez, Puerto Rico
  4. 4.0 135 km N of Suárez, Puerto Rico
  5. 3.8 135 km N of Suárez, Puerto Rico
  6. 3.9 113 km N of Suárez, Puerto Rico
  7. 3.5 137 km N of Suárez, Puerto Rico
  8. 3.9 136 km N of Suárez, Puerto Rico
  9. 3.2 127 km N of Suárez, Puerto Rico
  10. 3.8 134 km N of Su?rez, Puerto Rico
  11. 3.4 119 km N of Suárez, Puerto Rico
  12. 3.8 121 km N of Suárez, Puerto Rico
  13. 3.9 Puerto Rico region
  14. 3.7 139 km N of Suárez, Puerto Rico
  15. 4.1 139 km N 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 4.9 on 2018-11-14 — it released about 19 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.