QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

122 km N of Culebra, Puerto Rico

· 111 km deep · released about 5.5 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 3.7 (md)
Depth
111 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 119 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 359 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 5.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 31,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 970× the energy of this one
  4. This earthquake M 3.7 about 5.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 12× 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 19.4078, -65.2633. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 119 km (74 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 125 km (78 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 128 km (79 mi) NNE of here earthquakes near Río Grande Municipio
Loíza Municipio, PR 129 km (80 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 135 km (84 mi) NNE of here earthquakes near Carolina Municipio
Canóvanas Municipio, PR 137 km (85 mi) NNE of here earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 2.6 103 km NNE of Suárez, Puerto Rico
  2. 3.6 121 km NNE of Suárez, Puerto Rico
  3. 3.4 102 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.3 133 km NNE of Vieques, Puerto Rico
  5. 3.1 82 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.7 95 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.4 133 km NNE of Vieques, Puerto Rico
  8. 3.4 87 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.7 132 km NNE of Vieques, Puerto Rico
  10. 3.3 82 km N of Culebra, Puerto Rico
  11. 3.7 88 km NNE of Luquillo, Puerto Rico
  12. 3.1 77 km NNE of Luquillo, Puerto Rico
  13. 3.3 77 km N of Culebra, Puerto Rico
  14. 3.4 85 km NNE of Luquillo, Puerto Rico
  15. 3.8 107 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 61 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.