QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

110 km N of Suárez, Puerto Rico

· 100 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 111 kmFajardo Municipio 116 kmRío Grande Municipio 117 kmCarolina Municipio 117 kmSan Juan Municipio 117 kmLuquillo Municipio 117 kmCataño Municipio 118 kmToa Baja Municipio 118 kmDorado Municipio 120 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 3.9 (md)
Depth
100 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 111 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1195 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 11 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 15,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 680× the energy of this one
  3. Magna, Utah 2020 M 5.7 480× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 23× 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 19.4245, -65.7268. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 111 km (69 mi) NNE of here earthquakes near Loíza Municipio
Fajardo Municipio, PR 116 km (72 mi) N of here earthquakes near Fajardo Municipio
Río Grande Municipio, PR 117 km (73 mi) N of here earthquakes near Río Grande Municipio
Carolina Municipio, PR 117 km (73 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 117 km (73 mi) NNE of here earthquakes near San Juan Municipio
Luquillo Municipio, PR 117 km (73 mi) N of here earthquakes near Luquillo Municipio

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

Aftershocks so far

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

  1. 3.6 136 km N of Suárez, Puerto Rico
  2. 3.1 73 km NNE of Vieques, Puerto Rico
  3. 3.4 122 km NNE of Vieques, Puerto Rico
  4. 3.7 126 km NNE of Vieques, Puerto Rico
  5. 3.5 80 km NNE of Vieques, Puerto Rico
  6. 3.7 86 km NNE of Vieques, Puerto Rico
  7. 3.3 93 km NNE of Vieques, Puerto Rico
  8. 3.8 146 km NNE of Vieques, Puerto Rico
  9. 3.4 113 km NNE of Vieques, Puerto Rico
  10. 3.6 69 km N of Suárez, Puerto Rico
  11. 3.8 140 km NNE of Suárez, Puerto Rico
  12. 3.6 Puerto Rico region
  13. 3.8 138 km NNE of Suárez, Puerto Rico
  14. 3.7 145 km NNE of Vieques, Puerto Rico
  15. 3.9 141 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 4.4 on 2023-02-28 — it released about 6.2 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.