QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

88 km N of Suárez, Puerto Rico

· 122 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 88 kmSan Juan Municipio 93 kmCarolina Municipio 94 kmCataño Municipio 94 kmRío Grande Municipio 94 kmToa Baja Municipio 95 kmLuquillo Municipio 96 kmDorado Municipio 96 kmFajardo Municipio 96 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
122 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 88 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1265 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 19.2256, -65.8093. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 88 km (55 mi) N of here earthquakes near Loíza Municipio
San Juan Municipio, PR 93 km (58 mi) NNE of here earthquakes near San Juan Municipio
Carolina Municipio, PR 94 km (58 mi) N of here earthquakes near Carolina Municipio
Cataño Municipio, PR 94 km (58 mi) NNE of here earthquakes near Cataño Municipio
Río Grande Municipio, PR 94 km (59 mi) N of here earthquakes near Río Grande Municipio
Toa Baja Municipio, PR 95 km (59 mi) NNE of here earthquakes near Toa Baja 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. 3.9 Puerto Rico region
  2. 3.4 69 km NNE of Suárez, Puerto Rico
  3. 4.1 132 km N of Suárez, Puerto Rico
  4. 4.0 109 km N of Suárez, Puerto Rico
  5. 3.1 Puerto Rico region
  6. 4.0 Puerto Rico region
  7. 4.0 128 km N of Suárez, Puerto Rico
  8. 3.9 124 km N of Suárez, Puerto Rico
  9. 3.6 118 km N of Suárez, Puerto Rico
  10. 3.4 132 km N of Suárez, Puerto Rico
  11. 3.4 79 km NNE of Vieques, Puerto Rico
  12. 3.2 63 km NNE of San Juan, Puerto Rico
  13. 3.7 113 km N of Suárez, Puerto Rico
  14. 3.3 49 km N of San Juan, Puerto Rico
  15. 3.2 78 km N of San Juan, 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 2022-12-25 — it released about 4.6 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.