QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

8 km ENE of San Juan, Puerto Rico

· 102 km deep · released about 680 lb of TNT

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10 km30 km60 km120 km N San Juan Municipio 9 kmLoíza Municipio 11 kmCarolina Municipio 13 kmCataño Municipio 14 kmToa Baja Municipio 18 kmTrujillo Alto Municipio 18 kmGuaynabo Municipio 19 kmBayamón Municipio 22 kmCanóvanas Municipio 24 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
102 km below the surface
Felt
no reports yet
Nearest
San Juan Municipio, 9 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3347 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 18.4956, -66.0318. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan Municipio, PR 9 km (6 mi) NNE of here earthquakes near San Juan Municipio
Loíza Municipio, PR 11 km (7 mi) WNW of here earthquakes near Loíza Municipio
Carolina Municipio, PR 13 km (8 mi) NNW of here earthquakes near Carolina Municipio
Cataño Municipio, PR 14 km (8 mi) ENE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 18 km (11 mi) ENE of here earthquakes near Toa Baja Municipio
Trujillo Alto Municipio, PR 18 km (11 mi) N of here earthquakes near Trujillo Alto Municipio

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

Aftershocks so far

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

  1. 2.4 34 km NE of Vieques, Puerto Rico
  2. 1.7 20 km NNE of Luquillo, Puerto Rico
  3. 2.5 25 km NNE of Luquillo, Puerto Rico
  4. 2.6 1 km N of Pueblito del Rio, Puerto Rico
  5. 3.1 24 km NNW of Loíza, Puerto Rico
  6. 3.3 51 km N of San Juan, Puerto Rico
  7. 2.8 3 km N of San Juan, Puerto Rico
  8. 3.4 29 km N of Dorado, Puerto Rico
  9. 2.1 4 km SSE of Cayey, Puerto Rico
  10. 3.1 1 km NW of Bayamón, Puerto Rico
  11. 2.7 18 km NNE of Luquillo, Puerto Rico
  12. 2.3 1 km S of Río Lajas, Puerto Rico
  13. 2.6 21 km NNE of Dorado, Puerto Rico
  14. 2.4 22 km NNE of Luquillo, Puerto Rico
  15. 3.1 5 km ESE of Cataño, 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.