QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

47 km NNE of San Juan, Puerto Rico

· 21 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 47 kmSan Juan Municipio 51 kmCarolina Municipio 52 kmCataño Municipio 52 kmToa Baja Municipio 53 kmRío Grande Municipio 56 kmDorado Municipio 56 kmTrujillo Alto Municipio 59 kmCanóvanas Municipio 59 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
21 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 47 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3425 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 18.8636, -65.9250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 47 km (29 mi) N of here earthquakes near Loíza Municipio
San Juan Municipio, PR 51 km (32 mi) NNE of here earthquakes near San Juan Municipio
Carolina Municipio, PR 52 km (32 mi) N of here earthquakes near Carolina Municipio
Cataño Municipio, PR 52 km (32 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 53 km (33 mi) NNE of here earthquakes near Toa Baja Municipio
Río Grande Municipio, PR 56 km (35 mi) NNW of here earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.1 24 km NNW of Loíza, Puerto Rico
  2. 3.3 51 km N of San Juan, Puerto Rico
  3. 2.3 78 km NNE of Vieques, Puerto Rico
  4. 2.4 56 km NNE of Luquillo, Puerto Rico
  5. 2.8 56 km NNE of Luquillo, Puerto Rico
  6. 2.1 53 km NNE of Luquillo, Puerto Rico
  7. 2.6 55 km NNE of Luquillo, Puerto Rico
  8. 2.4 Puerto Rico region
  9. 2.8 3 km N of San Juan, Puerto Rico
  10. 3.4 29 km N of Dorado, Puerto Rico
  11. 2.7 18 km NNE of Luquillo, Puerto Rico
  12. 2.0 35 km NNE of Luquillo, Puerto Rico
  13. 2.6 21 km NNE of Dorado, Puerto Rico
  14. 2.4 22 km NNE of Luquillo, Puerto Rico
  15. 2.7 48 km N of Loíza, 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.