QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

123 km NNE of Vieques, Puerto Rico

· 96 km deep · released about 17 tons of TNT

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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
96 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 126 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1058 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 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 19.4835, -65.4580. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 126 km (78 mi) NNE of here earthquakes near Loíza Municipio
San Juan Municipio, PR 134 km (83 mi) NNE of here earthquakes near San Juan Municipio
Cataño Municipio, PR 136 km (85 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 138 km (86 mi) NE of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 140 km (87 mi) NE of here earthquakes near Dorado Municipio
Vega Alta Municipio, PR 149 km (92 mi) NE of here earthquakes near Vega Alta 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. 3.8 120 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.6 116 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.4 82 km N of Culebra, Puerto Rico
  4. 3.3 92 km N of Culebra, Puerto Rico
  5. 3.7 92 km NNE of Luquillo, Puerto Rico
  6. 3.2 77 km NNE of Vieques, Puerto Rico
  7. 3.9 148 km NNE of Suárez, Puerto Rico
  8. 3.6 91 km N of Suárez, Puerto Rico
  9. 3.7 132 km N of Suárez, Puerto Rico
  10. 3.7 131 km NNE of San Juan, Puerto Rico
  11. 3.3 89 km N of Suárez, Puerto Rico
  12. 3.9 123 km N of Suárez, Puerto Rico
  13. 3.4 104 km NNE of San Juan, Puerto Rico
  14. 3.8 129 km N of Su?rez, Puerto Rico
  15. 3.1 Puerto Rico region

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.