QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

Puerto Rico region

· 57 km deep · released about 12 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 3.9 (md)
Depth
57 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Dorado Municipio, 151 km SW
Status
Reviewed by a seismologist

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

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 12 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 14,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 620× the energy of this one
  3. Magna, Utah 2020 M 5.7 440× the energy of this one
  4. This earthquake M 3.9 about 12 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 26× 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 19.5491, -65.3798. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 151 km (94 mi) NE of here earthquakes near Dorado Municipio

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

Aftershocks so far

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

  1. 3.2 94 km N of Culebra, Puerto Rico
  2. 3.4 Puerto Rico region
  3. 3.9 Puerto Rico region
  4. 3.9 Puerto Rico region
  5. 3.8 143 km N of Suárez, Puerto Rico
  6. 4.0 133 km N of Suárez, Puerto Rico
  7. 4.0 138 km N of Suárez, Puerto Rico
  8. 3.7 135 km N of Suárez, Puerto Rico
  9. 3.4 134 km N of Suárez, Puerto Rico
  10. 3.7 141 km NNE of Vieques, Puerto Rico
  11. 3.3 Puerto Rico region
  12. 3.7 Puerto Rico region
  13. 4.0 122 km N of Suárez, Puerto Rico
  14. 3.8 124 km N of Suárez, Puerto Rico
  15. 3.6 125 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 28 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.