QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9Md

38 km N of San Juan, Puerto Rico

· 39 km deep · released about 680 lb of TNT

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10 km30 km60 km120 km N Toa Baja Municipio 42 kmCataño Municipio 42 kmDorado Municipio 43 kmLoíza Municipio 44 kmSan Juan Municipio 44 kmCarolina Municipio 48 kmVega Alta Municipio 50 kmVega Baja Municipio 52 kmGuaynabo Municipio 53 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 2.9 (Md)
Depth
39 km below the surface
Felt
no reports yet
Nearest
Toa Baja Municipio, 42 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3482 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 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 lb of TNT

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 18.8164, -66.0791. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Baja Municipio, PR 42 km (26 mi) NNE of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 42 km (26 mi) N of here earthquakes near Cataño Municipio
Dorado Municipio, PR 43 km (26 mi) NNE of here earthquakes near Dorado Municipio
Loíza Municipio, PR 44 km (27 mi) NNW of here earthquakes near Loíza Municipio
San Juan Municipio, PR 44 km (27 mi) N of here earthquakes near San Juan Municipio
Carolina Municipio, PR 48 km (30 mi) NNW of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.1 67 km NNE of Suárez, Puerto Rico
  2. 2.9 44 km N of Brenas, Puerto Rico
  3. 2.6 1 km N of Candelaria Arenas, Puerto Rico
  4. 3.0 47 km N of Dorado, Puerto Rico
  5. 2.9 42 km NNE of Vieques, Puerto Rico
  6. 2.4 79 km N of Loíza, Puerto Rico
  7. 2.9 76 km NNE of San Juan, Puerto Rico
  8. 3.0 49 km N of Loíza, Puerto Rico
  9. 2.9 32 km NNW of Brenas, Puerto Rico
  10. 2.6 14 km N of San Juan, Puerto Rico
  11. 2.5 52 km N of Brenas, Puerto Rico
  12. 3.0 43 km NNE of San Juan, Puerto Rico
  13. 2.9 35 km N of San Juan, Puerto Rico
  14. 2.9 Puerto Rico region
  15. 2.6 1 km NW of Bayamón, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.