QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4Md

120 km N of Charlotte Amalie, U.S. Virgin Islands

· 71 km deep · released about 1.9 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 3.4 (Md)
Depth
71 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 123 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3441 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 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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 19.4101, -65.1408. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 123 km (77 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 130 km (81 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 134 km (83 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 136 km (85 mi) NE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 142 km (88 mi) NE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 147 km (91 mi) NE 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

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

  1. 3.1 96 km NNE of Vieques, Puerto Rico
  2. 3.4 96 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.4 101 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.1 72 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.3 96 km NNE of Luquillo, Puerto Rico
  6. 2.7 89 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 2.8 130 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.4 89 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 2.8 75 km N of Culebra, Puerto Rico
  10. 2.9 81 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.4 Puerto Rico region
  12. 2.5 75 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 2.7 71 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 78 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.0 80 km NNE of Luquillo, 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 4.3 on 2016-09-04 — it released about 22 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.